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| | DDR SDRAM - Wikipedia, the free encyclopedia |
 | | DDR SDRAM or double-data-rate synchronous dynamic random access memory is a type of memory integrated circuit used in computers. | | | With data being transferred 8 bytes at a time DDR RAM gives a transfer rate of (memory bus clock rate) × 2 (for dual rate) × 8 (number of bytes transferred). | | | Note: All RAM speeds in-between or above these listed specifications are not standardized by JEDEC — most often they are simply manufacturer optimizations using higher-tolerance chips. |
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http://en.wikipedia.org/wiki/DDR_SDRAM
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| | SDRAM - Synchronous Dynamic Random Access Memory |
| | SDRAM is replacing EDO DRAM in many newer computers. | | | SDRAM is replacing EDO DRAM in many newer computers | | | The clock is coordinated with the CPU clock so the timing of the memory chips and the timing of the CPU are "in synch." The synchronization eliminates time delays and allows for fast consecutive read and write capability, thereby increasing the overall performance of the computer. |
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http://www.auditmypc.com/acronym/SDRAM.asp
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| | ► » SRAM to be able to read/write Micron SDRAM |
| | # of bytes to be Read/Written from/to SDRAM | | | I find your query to be quite confusing. | | | Q has to be used for SRAM read and also for SDRAM read? |
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http://www.comp-one.net/SRAM-to-be-able-to-readwrite-Micron-SDRAM-8551414.html
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| | Understanding PC-100 specifications for G4 Macs |
| | The most advanced PC-100 is an intel SDRAM specification that outlines the SDRAM timing and functional parameter of memory modules operating at a 100 Mhz bus speed. | | | Apple's new blazingly fast Power Mac G4 capable of processing millions of instructions per second requires ultra fast 100 mhz SDRAM operating at maximum speed to deliver super computer performance. | | | This specification was based on simulated timing analysis of a 4-slot PC system (2 physical SDRAM banks per slot) running the memory bus at 100MHz. |
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http://www.transintl.com/technotes/222.htm
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| | VisionTek - SDRAM White Paper |
| | These technologies are driving the transition from a computing machine to a robust media platform serving several computing engines. | | | SDRAM simplifies the situation by interleaving two memory arrays into a single device. | | | Compounding this complexity is an often-confounding array of potential new memory choices vying for supremacy as the next-generation memory solution. |
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http://www.bahzone.net/mirror/Visiontek/sdramwp.html
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| | Memory upgrades from Crucial.com - The S Files page 6 |
| | You can only use SDRAM if the chip set on your motherboard supports it (the chip set is the part of the your computer that moves data to and from the processor). | | | And we understand that you don't want to buy a new computer only to find it will be obsolete in the near future. | | | That way, you can simply take the memory out of your old system and use it in the new one. |
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http://www.crucial.com/library/sfiles6.asp
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| | Lab 8 - SDRAM Controller |
| | Use the logic analyzer to view the signal waveforms at the SDRAM (use header pins on the daughter card) to verify that the timings are within specs. | | | SDRAM Data In Described in the lab notes for lab 8 | | | Paying close attention to timing diagrams and specs for both the FPGA board and the SDRAM is essential to making sure your interface runs properly. |
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http://www.ee.byu.edu/class/ee320/labs/lab8.html
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| | HardwareCentral - Tutorials - SDRAM Considerations |
| | But, in buying SDRAM for you system, there is some information you must consider. | | | Therefore, 10ns SDRAM should really not be used in systems using more than an 83MHz bus. | | | When choosing SDRAM for your computer, you need to know your motherboard and get exactly the type it requires. |
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http://www.hardwarecentral.com/hardwarecentral/tutorials/51/1/<!--image-
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| | Memory, Evolution or Revolution? |
| | With all of the controversial comparisons of Rambus as opposed to DDR SDRAM (and now DDR-II), along with the new Itanium chipset designs and processors surpassing the 1.5 GHz mark, even Intel is looking to move onto other technologies. | | | Until recently, Intel has placed their money on the proprietary memory design developed by Rambus, Inc. On the surface, Rambus looked to be the fastest solution for system memory due to its operational speeds up to 800MHz. | | | SDRAM only carries information on the rising edge of a signal. |
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http://www.dewassoc.com/performance/memory/intro_4.htm
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| | RDRAM vs SDRAM |
| | This means that all memory chips in a module of SDRAM are connected in parallel to the data bus that’s used to read and write data. | | | One simply cannot be expected to pay the same amount for RAM, as for a whole new computer. | | | However, adoption of this new technology has been somewhat slow, despite support from Intel in its 820 chipset-based motherboards. |
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http://www.pcquest.com/content/technology/10004404.asp
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| | PCWorld.com - Intel Will Support SDRAM With Pentium 4 |
| | DDR SDRAM Steps In Intel's announcement is a blow for Rambus and means it won't be the mainstream standard this year or next. | | | RDRAM is a type of computer memory that is supposed to dramatically improve a PC's performance by delivering data to a processor at much faster rates than SDRAM, a widely used and relatively inexpensive form of memory. | | | But as far as he is concerned, if Intel can secure the amount of RDRAM it requires, it "makes no sense to have inferior SDRAM-Pentium 4 systems enter the market." He referred to Intel's consistent remarks about RDRAM's performance benefits, especially when coupled with the Pentium 4. |
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http://www.pcworld.com/news/article/0,aid,17838,00.asp
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| | SDRAM |
| | I have noticed in the new computer ads that a number of vendors are starting to use SDRAM as a standard, including the Dell Dimension computers, which come with 32 megs of SDRAM. | | | If you have purchased a motherboard or computer in the last year or so and are thinking about memory upgrade you might check this out. | | | Which means, if you are in the market for a new computer I would check out the ones that are installing SDRAM. |
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http://home.att.net/~bdrm/Hardware/c.htm
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| | My-ESM - Intel discovers errors in chipsets running ECC-mode SDRAM |
| | Intel Corp. has discovered errors in its Intel 820 and Intel 840 chipsets when the devices are deployed in a mode that supports error-corrected SDRAM memory, the company confirmed late today. | | | The processor is also slated to use an MTH-conversion chip to enable it to interface to SDRAM, Intel confirmed this week. | | | Still, sources said the MTH glitch shouldn't affect Intel's upcoming Timna processor, which integrates graphics, the north bridge, and memory controller, and is aimed at sub-$500 PCs. |
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http://www.my-esm.com/story/OEG20000218S0082
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| | Synchronous DRAM (SDRAM) |
| | The motherboard queries the chip for information about the module and makes adjustments to system operation based on what it finds. | | | In order to do this, the memory must be fast enough for the bus speed of the system. | | | Speed Rating: Due to the confusion inherent in the speed rating system described immediately above, and the likelihood of problems running slower SDRAM modules on new 100 MHz system bus motherboards, Intel created a formal specification for SDRAM capable of being used in these new PCs. |
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http://www.pcguide.com/ref/ram/techSDRAM-c.html
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| | Memory Types PC66 PC100 PC133 PC150 DRAM FPM EDO SDRAM nDRAM |
| | Both EDRAM and ESDRAM devices are in the category of cached DRAM and are used mainly for L2 cache Memory. | | | It's reported that PC100/PC133/PC150 SDRAM will improve performance by 10-15% in an Intel® Socket 7 system (but not in a Pentium® II because its L2 cache speed runs at only half of processor speed). | | | Like SDRAM before it, DDR SDRAM will interleave Memory access so that several Memory accesses can be performed simultaneously. |
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http://home.cfl.rr.com/eaa/MemoryTypes.htm
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| | DDR SDRAM and the TM-4 |
| | The core is optimized to perform block transfers of consecutive data and is not appropriate for random memory access patterns. | | | The algorithm employed is one in which a request on interface A always is serviced before a request on interface B. There is no guarantee that interface B will ever gain access to the memory. | | | The need to both activate and precharge the 2D memory array means that data can not be transmitted on every clock cycle, since the memory bank is busy handling other tasks. |
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http://www.eecg.toronto.edu/~tm4/ddrsdram.html
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| | popcorn1 |
| | The host makes a read or write access, and if the SDRAM controller is busy, it will generate a "busy" output, which the host upon sampling must hold the bus. | | | The IP handles all of the low level tasks such a power-up SDRAM initialization, refresh generation and arbitration. | | | Altera design files for 16 bit sdram version available. |
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http://www.cmosexod.com/sdram.html
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| | Sharky Extreme - '+$ArtG+' - '+$ArtC+' - '+$ArtN+' |
| | There are also sections dealing with SDRAM ratings, memory tweaking and overclocking, as well as the requisite selection of reference memory benchmarks. | | | We have tested a high-grade 128 MB stick of 6 ns SDRAM that will hit a 145 MHz memory frequency at 3-3-3, but refuses to work even as low as 133 MHz using 2-2-2. | | | As the content provided here may be old hat to experienced users, this guide has been written with the novice or intermediate user in mind. |
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http://www.sharkyextreme.com/hardware/guides/memory_perf
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| | 256MB DDR PC2100 upgrades from Crucial.com |
| | 184-pin DIMMs are used to provide DDR SDRAM memory for desktop computers. | | | For example, if your computer came with a 128MB memory module, you can add a 256MB module for a total of 384MB of RAM. | | | For more information about the Ballistix memory line, please visit the Ballistix section of our Web site. |
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http://www.crucial.com/store/PartSpecs.asp?imodule=CT3264Z265
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| | Intel to bring SDRAM to Pentium 4 Tech News on ZDNet |
| | However, the company maintains that it always considers supporting multiple memory technologies for its chip sets. | | | However, they acknowledge a need for a memory technology that will allow PC makers to deliver Pentium 4 systems at lower, "mainstream" prices. | | | The chip set will be available next year, Intel |
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http://news.zdnet.com/2100-9595_22-522472.html?legacy=zdnn&chkpt=zdhpnews01
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| | PIV SDRAM vs PIV DDR vs XP DDR vs T-Bird SDRAM - HELP! |
| | Of course, what he neglects to tell you is that the PIV is running the PCI bus 30% faster¹ than spec while the XP is not, and that the PIV he is using is an engineering sample with an adjustable multiplier (not available to the public) - but minor details. | | | If you were walking in to COMP USA, for example, and saw two systems side by side, one a PIV 1700 and an XP 1700+, you might think they were comparable systems. | | | SUMMARY: The case for an upgrade depends on where you start from - the more current your system, the less the benefit. |
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http://www.overclockers.com/articles504
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| | EETimes.com - AMD favors PC133, DDR SDRAM over Rambus for Athlon |
| | What's more, using a 133-MHz variant of SDRAM from NEC, known as Virtual Channel Memory, with a 133-MHz front-side bus yields a memory subsystem performance increase of more than 50 percent over systems with PC100 SDRAMs and a 100-MHz front side bus, Ishizuka said. | | | TOKYO — Advanced Micro Devices Inc. will lean heavily on PC133 and double-data rate synchronous DRAMs to boost the performance of its new Athlon processors, putting Rambus memory on the back-burner due to its high initial cost and the comparable performance of SDRAM-based memory, the company said. | | | According to Asao Ishizuka, a long-time industry consultant who tests motherboards and writes for Nikkei Business Publications, making the switch from a system with a 100-MHz front-side bus and PC100 SDRAMs to a system with a 133-MHz front-side bus-capable chip set and 133-MHz SDRAMs increases memory subsystem performance more than 20 percent. |
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http://www.eetimes.com/story/OEG19990812S0009
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| | SDRAM, PC100, PC133, and DDR |
| | The "GL" or "G8" will be seen on the actual SDRAM chips on the memory circuit board, so you will know what you're looking at. | | | EDO RAM is moving into the older systems, mainly, while even the bargain PC's make the move to SDRAM. | | | This SDRAM usually operates at 10ns, although some is created that is faster. |
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http://www.pcmech.com/show/memory/154/about.htm
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| | Ramcheck - #1 Quality and affordable DDR Memory tester, SDRAM Memory Tester, DDR DIMM Testers |
| | The "must have" for anyone in computer service, assembly or repair. | | | As the #1 manufacturer of portable computer memory test equipment, our reliable and affordable RAMCHECK memory tester checks all popular memory modules: In just seconds, you can fully test and identify all common computer memory, including PC333/266/200 DDR (also known as PC2700/ 2100/1600), 168-pin PC166/150/133/100/66 SDRAM DIMMs, EDO and FPM modules, SODIMM laptop computer memory. | | | Now take the guess work of good or bad memory in your PC’s, and eliminate intermittent memory errors forever. |
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http://www.jaguarmi.com
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| | The Definitive Review Of The 128MB OCZ Performance Enhanced SDRAM DIMM |
| | This should help improve the overclockability of this DIMM, although I suspect that the availability of the 128Mbit SDRAM chips required also played a part. | | | A check reveals that the chips is actually Infineon's 7.5ns SDRAM which is designed to run at only 133MHz 3-3-3! | | | BTW, OCZ also uses chips from Micron so don't be surprised if your OCZ Performance Enhanced SDRAM DIMM comes with Micron chips instead. |
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http://www.adriansrojakpot.com/Reviews/OCZ_128MB_Enhanced/OCZ_128MB_Enhanced_02.htm
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| | EBSA-285 SDRAM Memory Upgrade |
| | This amount of memory is sufficient to boot a Linux kernel and to load a few device drivers, but not much else. | | | In particular, the SDRAM’s “array configuration” must comply with Table 8-1 “SDRAM Array Configuration: 2-Array Part” and/or Table 8-2 “SDRAM Array Configuration: 4-Array Part” in section 8.8.7 of the | | | 64 MB 8M x 64 One-Bank Unbuffered SDRAM Module |
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http://www.ee.calpoly.edu/3comproject/CurrentStatus/jfischer/Ebsa285_SDRAM
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| | Tweakers Australia - Technology News, Reviews and Analysis |
| | SDRAM and DDR SDRAM are the most common types of memory used in personal computers across the globe, and offers fairly good performance as well as being very cost effective. | | | Just recently 133MHz PC1066 was launched, although unofficially supported by the new Intel P4 and the Intel 850E core logic chipset, but still promises to bring memory performance to the next level. | | | Essentially, main system memory goes by the same rule, and is often overlooked in most cases. |
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http://www.tweakers.com.au/articles/cpu_mem/rdram_ddr/page1.asp
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| | SDRAM FAQ |
| | The information is read by the computer's BIOS during boot to tell the computer how to properly configure the memory controller for the memory modules that are installed in the system. | | | Typical memory controllers read and write 64 bits of data at a time to and from memory modules that do not support ECC. | | | CAS latency refers to the number of clock cycles between the application of the SDRAM's column address and the appearance of the data at the output of the module. |
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http://www.corsairmicro.com/main/tsdramfaq.html
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| | glossary |
| | While today's most common SDRAM delivers data at a maximum speed of 133MHz, RDRAM currently transfers data at up to 800MHz. | | | (Virtual Channel Memory) is the new SDRAM architecture, which realizes flexible and high-efficiency data transfer by incorporating channel buffers configured by high-speed registers. | | | Data is cached first to the faster primary cache, and then, when the primary cache is full, to the slower secondary cache. |
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http://www.tyan.com/support/html/glossary.html
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| | Intel(R) Intel® Platform Memory - PC SDRAM Validation |
| | The objective of the Intel® validation program for DDR and DDR2 is to verify DDR/DDR2 SDRAM compliance to the Intel® specifications for DDR/DDR2 and performance of supported DDR memory modules in Intel® reference systems, so as to provide a guideline for memory compatibility with Intel® chipsets. | | | Intel(R) Intel® Platform Memory - PC SDRAM Validation | | | Validation is performed at the component and Registered DIMM/Unbuffered DIMM/SO-DIMM levels and the link to the validation page is below: |
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http://www.intel.com/technology/memory/ddr/valid/overview.htm
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| | Computer Memory |
| | Corsair TWINX2048-3200 - (tested and packaged in matched pairs specifically designed for dual channel ddr motherboards) XMS3200 DDR400, 2 x 1024MB (2 GB Total), JEDEC standard latency, NON-ECC, 184-pin DIMM, with Heat Spreader | | | 1GB DDR333 (Corsair VALUE SELECT SDRAM 184-pin DIMM - VS1GBKIT333 - (packaged in matched pairs for dual channel ddr motherboards) PC2700 2 x 512MB modules | | | 1GB DDR400 (Corsair VALUE SELECT SDRAM 184-pin DIMM - VS1GBKIT400C3 - (packaged in matched pairs for dual channel ddr motherboards) PC3200 2 x 512MB modules |
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http://www.aberdeeninc.com/abcatg/memory.htm
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| | Real World Technologies - DDR SDRAM - A First Glance |
| | There is only one way to find out - do some comparison testing. | | | In reality they all perform about the same, though the results do not include an Athlon using PC2100 memory. | | | Basically it’s SDRAM memory that has the ability to perform two operations per cycle, or 'Double Data Rate', instead of just one like standard SDRAM memory. |
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http://www.realworldtech.com/page.cfm?articleid=RWT012101000000
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| | Definition of SDRAM |
| | It's called "Synchronous" DRAM because the memory is synchronized with the clock speed that the computer's CPU bus speed is optimized for. | | | SDRAM speed is measured in Megahertz, which makes it easy to compare the the processor's bus speed to the speed of the memory. | | | SDRAM is an improvement to standard DRAM in that it retrieves data alternately between two sets of memory. |
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http://www.sharpened.net/glossary/definition.php?sdram
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| | Target PC :: Soyo SY-P4ISR (845 SDRAM) Mainboard |
| | Note that as Intel positioned the 845 as a value segment, ECC support is not available on the memory controller. | | | The only difference between the 845D (DDR) and the 845 (SDRAM) is the memory controller which features support for DDR SDRAM. | | | Intel introduced their 845 chipset earlier this year in order to accommodate their Pentium 4 with a value segment chip which costs less to produce and eliminating the need of using the expensive RDRAM memory. |
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http://www.targetpc.com/hardware/motherboards/soyo_p4isr
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| | 3DSpotlight DDR SDRAM shoot out: Crucial PC2100 vs. OCZ Performance PC2400 |
| | The new naming system for SDRAM is no longer based on the number of clock cycles, indeed if this was the case I would be reviewing PC133/PC150 memory. | | | The bandwidth is found by multiplying the effective frequency (which in the case of DDR is twice the number of clock cycles) by the width of the memory (in the case of SDRAM this is 64 bit) and dividing the result by the number of bits per byte, which is always 8. | | | TechSpot giveaway soon, and your preferred prize would be... |
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http://www.3dspotlight.com/reviews/hardware/ddr_crucial-ocz/index.shtml
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| | An unofficial guide to DDR400 or PC3200 DDR SDRAM |
| | Samsung the world ''s leading supplier of advanced memory technology, recently announced that it is first to ship Double-Data-Rate 400Mbps SDRAM (DDR400) modules in 128MB, 256MB and 512MB densities. | | | In the latest volley over next-generation DRAM performance, PC chipset makers and memory chip makers have been announcing a so-called PC3200 double-data-rate device that will compete head-on with the Direct Rambus architecture. | | | The 400Mbps (200MHz) DDR devices are ideal for use as PC system main memory, offering three times the performance of Single-Data-Rate PC 133 SDRAM and 50 percent more bandwidth than mainstream DDR266. |
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http://www.simmtester.com/page/news/showpubnews.asp?num=85
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| | TechWeb: The Business Technology Network |
| | The technology is already picking up speed as dedicated memory for graphics cards and also should penetrate the emerging Internet-enabled handheld device market, according to observers. | | | Chip makers also expect Apple to launch a line of desktop systems this year that will use DDR SDRAM as main memory. | | | Double-data-rate (DDR) SDRAM could account for half of the memory market's unit shipments after 2002, a majority share that once was the sole claim of Direct Rambus DRAM, according to chip vendors and analysts. |
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http://www.techweb.com/wire/story/TWB20000114S0016
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| | Infineon unveils PDA SDRAM The Register |
| | Dubbed Mobile-RAM, the new chips offer 128Mb (16MB) of capacity in 8Mb x 16 configuration making it suitable for 16-bit and 32-bit operating systems, which makes it suitable, interestingly enough, for Palm's current OS as well as more advanced offerings, such as EPOC 32. | | | Infineon has also thrown some power saving technology into the mix, such as the ability to switch off the self-refresh feature o individual chunks of memory. | | | Infineon has launched a mobile-oriented SDRAM technology designed to provide "very low power consumption, small form factor and low cost per bit" to suppliers of palmtops and cellphones. |
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http://www.theregister.co.uk/content/3/16832.html
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| | EXTREME Overclocking - Tweaking PC Hardware To The Max |
| | There`s a $261 instant savings and $100 rebate on this computer, and you even get a Dell e173FP 17" LCD monitor with it ($279 value), though we`d highly suggest the 19" LCD monitor upgrade for just $80 more. | | | However, in all their memory modules I have used, I always set the delays to 2 and they work perfect. | | | A while back, Mushkin merged with Ramtron which makes the "Enhanced SDRAM" line of memory modules. |
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http://www.extremeoverclocking.com/reviews/memory/corsair_mushkin_1.html
(1103 words)
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| | AnandTech: PC133 SDRAM Roundup - April 2000 |
| | An entire year has passed since we last rounded up the latest SDRAM memory modules available online for a head to head comparison, and in the past year quite a bit has changed. | | | Intel attempted to remove these SDRAM compatibility issues by creating their own PC100 SDRAM specification which outlined, in a very detailed manner, the requirements for a memory module to be classified as PC100 which would make it fit for use on a BX motherboard running at the 100MHz FSB. | | | Although the PC100 specification wasn’t followed down to the last dot, most manufacturers followed it closely enough that stories of SDRAM compatibility issues were relatively scarce among BX motherboard owners. |
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http://www.anandtech.com/showdoc.html?i=1213
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