This is achieved by further improvements in the bus signal. Add to cart. The latency from write command to data input depends on the memory type, as shown in the following table. Page 7: DDR2 Latency Times Page 8: Overview Of DDR Vs. 1. S. Plus les générations de DDR se succèdent et s'améliorent, plus la fréquence tout comme la CAS Latency augmentent. The DDR2 specification is not finalized at this point, but the information contained here is based upon the most recent drafts for DDR2 devices and conversations with JEDEC members. Crucial 1GB 240-Pin DDR2 SDRAM DDR2 667 (PC2 5300) Desktop Memory Model CT12864AA667. So if you had a stick of DDR2-800 with a latency of 5, and a stick of DDR3-1600 with a latency of 9, the "relative" speed of the DDR2 is going to be 800/5 or 160 MHz, and the DDR3 is. Which of the following is the MOST important consideration when building the computer?, You are in a carpeted office lighted by fluorescent bulbs. 1. ) SODIMMs are smaller and thinner than regular DIMMs, and the 204-pin SODIMM PCBs are always ~2. Figure 4 illustrates an example of DDR2 bank interleave reads with AL = tRCD – (1 x tCK). This determines the length of a sequential data input by the write command that is set to 8. Fill form: Try Risk Free. Study with Quizlet and memorize flashcards containing terms like You want to build a new system that supports 16 GB of memory. 50V Buffered/Registered: Unbuffered Model #: hynix-4gb-ud-800 x2 Item #: 9SIB18ZFF60936 Return Policy: View Return Policy $121. $ 24. DDR2 Page 9: A Quick Start: Corsair CM2X512 Page 10: PCI Express: Up To 8 GB/s Page 11: PCI Express Graphics Cards Page 12: PCI-X Vs. 0. 9 (Xilinx Answer 52123) MIG 7 Series DDR3/DDR2 - Calibration fails during PRBS Read Leveling stage when. Click Calculate. It controls CAS latency, burst length, burst sequence, test mode, DLL reset, WR and various vendor specific options to make DDR2 SDRAM useful for various applications. Disadvantages of DDR3 compared to DDR2. CAS Latency: 6 Voltage: 1. The dynamic RAM came into first use in 2007 and superseded. However, looking at the tables you provided, if memory with CL=4 held on from DDR-800 to DDR-1000, latency (ns) is reduced from 10ns to 8s. Skill Pi Black memory in a P45. WRITE latency (WL) is equal to the READ latency minus one clock: WL = AL + CL - (1 x tCK). Compatible Timings This product is programmed to use. 2 x 2 GB DDR2 @ 800 Mhz RAM And poor and shitty GT1030 DDR4 version which i overclocked (over 250 Mhz on core and 500 Mhz on memory). SKILL 2x512 DDR2 PC2-4200 LA SERIES (4-4-4-12) - 89. 8V CL5 240-Pin Desktop Computer RAM Memory Upgrade Kit. (2) Crucial 8GB (2 x 4GB) 204-Pin DDR3 SO-DIMM DDR3L 1866 (PC3L 14900) Laptop Memory. Quick View. CAS Latency: 5; Timing: 5-5-5; Model #: 849005060516;. CAS Latency. Joined Aug 6, 2002 Messages 8,070Photo by Heather Greene. CAS Latency shows the delay of time it takes, so the lower the CAS latency, the better. The goal of the Low Latency DRAM Working Group is the creation of a single cache-enhanced (i. The formula for the exact speed rating changes slightly based on the version of DDR memory your computer is using (see below). 8V 200-Pin SO-DIMM Laptop Notebook Computer RAM Memory Upgrade Kit. G. 0 RAS# To CAS# 5 RAS# Precharge 5 tRAS 18 tRC 24. Typical latency values for mainstream DDR2 memory are CL=5 and CL=6, compared to CL=2. 11. These preliminary studies are based upon ongoing collaboration between the authors and the Joint Electronic Device Engineering Council (JEDEC) Low Latency DRAM Working Group, a working group within the JEDEC 42. Calculate Ram speed clock interval in nanosecond format. a ddr2/533 cycle is slower than a ddr2-800 one. for the time specified by AL before it is issued internally to the DDR2 SDRAM device. Lower the latency better the performance, DDR2 has less value of latency and has a better performance relative to the DDR3. The notch on DDR2 DIMMs is in a different position than DDR DIMMs, and the pin density is slightly higher than DDR DIMMs. of DDR2: latency times very high. $ 38. 8V 200-Pin SO-DIMM Laptop Notebook Computer RAM Memory Upgrade Module. DDR5 Memory List. Thus, delays with memory access in DDR 3-1066 type , naturally occur to be higher in comparison with memory access with type DDR 2-1066. Speed: This refers to how quickly your computer can store and retrieve data from your memory module. The CAS latency refers to the number of clock cycles it takes for data requested by the memory controller to become available to a data pin. DDR and DDR2 are both types of SDRAM. Anonymous formIt replaced DDR2 hence has better performance overall, faster clock speed, and better power efficiency. DDR2 has a 4-bit prefetch, which is twice that of DDR. DDR3 RAM usually has a CAS latency of 9 or 10, while DDR4 will have a CAS latency of at least 15. If the only differences within your two sets of memory is the timings and cas latency then you can try it out and see if it works. 1 There's no general formula. Non-standard voltage range on a board that cannot adjust the memory voltage. For example, a DDR-400 stick running at 2-2-2-5 would be, in theory, equivalent to a DDR2-800 stick running at 4-4-4-10 timings. Compare. SKILL 2GB DDR2 800 (PC2 6400) Desktop Memory Model F2-6400CL5S-2GBNT. DDR3-1333 = PC3-10600. G. Acquisition of raw data without zero suppression requires new electronics for LKr readout 8 sample ADC x 8 bit x 1 MHz (L0 trigger rate) x 13k channels ~ 100 GByte/s for the whole LKr calorimeter. DDR2 SDRAM specifies the use of the SSTL-18 I/O standard and can With DDR2 and DDR3 memories the total latency will be CL+AL. 79. $ 81. DDR2-667 every three nanoseconds and DDR3-1333 every 1. Systems with identical numbers of. CAS Latency: 5 Voltage: 1. MemoryMasters DDR2 800mhz PC2-6400 DDR2 8GB Ram (4x2GB) PC2-6400U DDR2-800 Udimm Ram Non-ECC Unbuffered Desktop Memory Modules. 00 –Hi guys, I was looking at what DDR4 8GB RAM to buy and found there were some that were the same price but differed in "Latency" and "Memory Speed". The following figure shows an example of bank interleaving in a read operation without additive latency. I'm probably wrong, but I'm based on the information in the Nexys A7 reference manual. DDR3 chip has an automatic leveling circuit for calibration and to memorize the calibration data. The key difference between DDR and DDR2 is that in DDR2 the bus is clocked at twice the speed of the memory cells, so. Where the Corsair PC2-8888 is rated at 4-4-4 timings at DDR2-1111, Dominator 1250 is rated at a higher 5-5-5 latency at its specified 1250 speed. A typical memory configuration looks something like this: DDR2-533 with CL 4. Timings were still a respectable 5-4-5-15. 4 ns * 5 = 12. Check the manufactors site for details. PCI ExpressDDR2 SDRAM LATENCY 11. that is only in bandwidth, not latency. Latency information from CPU-Z on a PC running Windows XP. The 1-Gbit device is organized as 16 Mbit ×8. 80V Buffered/Registered: Unbuffered Multi-channel Kit: Dual Channel Kit Model #: AT4G2D2S800NA0N18V Item #: 9SIAMBVK019539 Return Policy: View Return Policy. Theoretical first word latency for the slow 4800MT/s CL40 kits is 16. 0 or DDR-667 with CL 5. 1. CL: The result in nanoseconds =. † Programmable CAS# latency (CL) † Posted CAS# additive latency (AL) † WRITE latency = READ latency - 1 tCK † Programmable burst lengths: 4 or 8 † Adjustable data-output drive strength † 64ms, 8,192-cycle refresh † On-die termination (ODT) † Serial presence-detect (SPD) with EEPROM † Gold edge contacts Team Vulcan 32GB (2 x 16GB) 262-Pin DDR5 SO-DIMM DDR5 5200 (PC5 41600) Laptop Memory Model FLBD532G5200HC38DC-S01. RAM Speed vs. TN-47-19: DDR2 (Point-to-Point) Features and Functionality DDR2 SDRAM Functional Overview Figure 1: Comparison of DDR2 with Previous Memory Technologies DDR2 SDRAM Functional Overview DDR2 SDRAM functions much like DDR SDRA M—a source-synchronous data strobe is used and data is transferred on both the leading and trailing clock edges. 9/23/08 Page 6. DDR4-3200 = PC4-25600. 4. DDR2 Page 9: A Quick Start: Corsair CM2X512 Page 10: PCI Express: Up To 8 GB/s Page 11: PCI Express Graphics Cards Page 12: PCI-X Vs. RLDRAM 3 Latency 11. The timing parameter t RRD is specified in terms of nanoseconds, and Table 11. Physically DDR2 has a number of connectors highest: 240 against 184 for the DDR standard. Double Data Rate Synchronous Dynamic Random-Access Memory ( DDR SDRAM) is a double data rate (DDR) synchronous dynamic random-access memory (SDRAM) class of memory integrated circuits used in computers. List View. 25 –Lowest Latency Test Results. The clock cycles of a DDR3 RAM is much shorter as compared to its counterparts which also is the cause for its higher CAS. [3. Memory bandwidth per DIMM gets a ~50% boost. That is why we say that AMD EPYC Genoa, with 50% more. These numbers indicate the amount of clock cycles that it takes the memory to perform. Latency . poor DDR2 latency and somewhat slow memory reads; There is good reason to believe that the latency and read speeds can be addressed to some extent with a future BIOS update, and Gigabyte was. We had to dial the transfer rate up to DDR5-6400 C36 to get on par with DDR4-3200 C22 in terms of latency. (ie: DDR3 is "double data rate type three"). While. ddr3 will be around for a bit so if you decide to get a. 8 Gbyte/s. CAS Latency: 38 Timing: 38-38-38-84 Voltage: 1. MemoryC StoreVisit Store. OR A DDR2 memory operated at twice the external data bus clock rate as DDR will provide twice the bandwidth with the same latency. 21 Cryptography, Memory Bandwidth, Memory LatencyThe transfer rate of DDR is between 266~400 MT/s. Using additive latency together with bank interleaving increases the bandwidth of the controller. Variable Controller Latency 11. Channel bandwidth determines your device's data transfer rate. Or the "most cherry picked RAM from many. Table 1. The most popular DDR2 RAM modules are at least twice as first as the best-rated DDR memory modules. Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community. Latency is a measure of how long it takes to receive information from memory; the higher the number, the greater the latency. Additive Latency. (Information about which memory technology your system uses is included in the Crucial Memory Advisor tool. Add to cart. Latency is VERY important, and discounting is a huge fallacy. Latency. 2. Latency Time - In nanoseconds (ns), lower is better. 80V Buffered/Registered: Unbuffered Model #: NP170 Item #: 9SIAD8UJV01439 Return Policy: View Return Policy $63. com for ram ddr2 pc4200. Latency is measured in. CAS Latency: 5 Voltage: 1. DDR2 has a lower latency rate which makes it ideal for tasks that require quick access to memory, such as gaming or video editing. Figure 4 illustrates an example of DDR2 bank interleave reads with AL = tRCD – (1 x tCK). The memory theorical bandwidth is computed using the module access time information for the maximal CAS# latency value, included in the SPD area. DDR SDRAM were originally produced at the 133MHz clock rate with a 7. Compared to DDR, DDR2 offers extraordinary performance, reduces power consumption, maximizes DRAM throughput, improves signal integrity, and optimizes flexibility. 50 AMD ATHLON 64 SOCKET AM2 3000+ ORLEANS BOX - 114. 50 AMD ATHLON 64 SOCKET AM2 3000+ ORLEANS BOX - 114. 80V Multi-channel Kit: Dual Channel Kit Timing: 5-5-5-15 Model #: 996756 Item #: 9SIA1K6JJY4795 Return Policy: View Return Policy $34. DDR2 Memory Banks 4 Banks YES DDR2 memory offers an eight bank version. CAS Latency: 6 Timing: 6-6-6 Voltage: 1. I've had SDDRAM for years, but currently switching up my mobo and RAM to DDR2 667 PC5300. When folks in the industry say that DDR5-4800 found in AMD EPYC 9004 Genoa and 4th Gen Intel Xeon Scalable Sapphire Rapids is a big deal, this is why. 6 inches long and are. These parameters are stored in every DIMM part in its EEPROM area which is called the SPD (Serial Presence Detect) table. View: 36. The CAS latency refers to the number of clock cycles it takes for data requested by the memory controller to become available to a data pin. $45. A-Tech StoreVisit Store. They were upon the fields of Latency and the oceans of Bandwidth. 8V 200-Pin SO-DIMM Laptop Notebook Computer RAM Memory Upgrade Module. NEMIX RAM StoreVisit Store. Sort By: Featured Items. CAS Latency: 5 Voltage: 1. 3. Latency Time - In nanoseconds (ns), lower is better. The formula for the exact speed rating changes slightly based on the version of DDR memory your computer is using (see below). 80V Multi-channel Kit: Dual Channel Kit Buffered/Registered: Unbuffered Model #: KVR667D2N5K2/4G Item #: 9SIAE9A7DN3081 Return Policy: View Return Policy $49. To express recombinant DDRs using the Tet-Off ® expression system, we utilized human fibrosarcoma HT1080. 99. $ 34. 90 G. Ok, I am new to DDR2. 99 –For example, my DDR2-800 is reported as DDR2-667. Voltage is another important aspect of RAM generations. 5-5-5-15). Here is information about the transfer rate of 650Mbps at clk_period = 3077ps. The figure shows the best latency and bandwidth characteristics for a DDR2 closed page system. The memory device holds the write command for the number of cycles specified by the additive latency. Third-generation – DDR3 SDRAM. DDR SDRAM, also retroactively called DDR1 SDRAM, has been superseded by DDR2 SDRAM, DDR3. 2. . • Peak and average current consumption for VTT and VDDQ DDR2 memories have a write latency equal to the read latency (CL + AL) minus one. 7. The prime difference between DDR1 and DDR2 is that DDR2 can run its I/O bus clock twice the memory clock but with higher latencies and DDR2 has prefetch size of 4 bits as opposed to DDR1’s 2 bits. $ 24. DDR2 Page 9: A Quick Start: Corsair CM2X512 Page 10: PCI Express: Up To 8 GB/s Page 11: PCI Express Graphics Cards Page 12: PCI-X Vs. 7: 1. CAS Latency: 6 Timing: 6-6-6-18 Voltage: 1. Avarum RAM equal to 8GB (2 x 4GB) 200-Pin DDR2 SO-DIMM DDR2 800 (PC2 6400) Dual Channel Kit Laptop Memory Model CT2KIT51264AC800. DDR3's come with heavier functions and capabilities, which make it lag more than DDR2. For example, DDR has latencies in the range of 1. (Not more than 10 or so years old) the motherboard will automatically attempt to sync the different memory modules. DDR2’s lower latency rate provides quick access to memory, making it ideal for gaming or video editing. Form Factor: SO-DIMM; Type: 144-pin and 16-bit output; CAS Latency: 4; Clock Frequency: 267 MHz (533 Mb/s/pin) or more; Capacity: 64, 128 or 256 MB; DRAM Type: DDR2 SDRAM; And so I bought. A-Tech 4GB (2x2GB) DDR2 667MHz DIMM PC2-5300 UDIMM Non-ECC 1. It is used to calculate the RAM chip’s computation bandwidth. Page 7: DDR2 Latency Times Page 8: Overview Of DDR Vs. The reaction times of the best fast draw shooters is. MemoryMasters 16GB (4X 4GB) 240 Pin 667MHz PC2-5300F DDR2 CL5 ECC Fully Buffered FB-DIMM Memory Module w/Heatspreaders for Apple Computers. According to @harukaze5719, this latest leak comprised a Core i5-12600K 10-core CPU running the AIDA64 cache & memory test, with a kit of DDR5 memory operating at DDR5-6400. Bandwidth is 8. of DDR2: latency times very high. Mixing memory in a computer build is never the appropriate thing to do unless you are strapped financially and cannot afford to purchase a new set of the same memory you already have installed. DDR3 SDRAM LATENCY 11. Table 1-1 Comparison of Main Specifications of DDR, DDR2 and DDR3 Item DDR DDR2 DDR3 Data rate/pin CLK frequency 200/266/333/400 Mbps (100/133/166/200 MHz) 400/533/667/800 Mbps 8GB (4x2GB) DDR2-800MHz PC2-6400 Non-ECC UDIMM 2Rx8 1. 89 –Zynq MPSoC Dynamic DDR DIMM Configuration. Systems with identical numbers of. Click Calculate. So, for a 200MHz DDR400 CL3 module, the latency. 7: 1. DDR3 is comparatively faster than DDR2. Where the Corsair PC2-8888 is rated at 4-4-4 timings at DDR2-1111, Dominator 1250 is rated at a higher 5-5-5 latency at its specified 1250 speed. com's DocMemory Diagnostic is yet another computer memory test program and works very similarly to the other programs I've listed above. 8V ±0. RAM Generation (DDR, DDR2, DDR3, DDR4) Form Factor / pin count. The portfolio of DDR3 speeds has opened up far sooner than it had for DDR2, as DDR3 data rates of 1066, 1333 and 1600 MHz have all appeared within the past few months to replace DDR2's 533-, 667. Free Shipping. you will have latency issues. In general, the lower the CL, the better. g. Module speed is a measure of the ability to transfer data, like: DDR2 800MHz, DDR3 1600MHz, and DDR4 2400MHz (or MT/s). Latency information from CPU-Z on a PC running Windows XP. NEMIX RAM StoreVisit Store. 34 –Mushkin Enhanced Silverline 4GB (2 x 2GB) DDR2 800 (PC2 6400) Desktop Memory Model 996760. (1) Used - Like New SAMSUNG M395T1K66AZ4-CE66 SAMSUNG DDR2 8GB/667 FB DIMM. ) SODIMMs are smaller and thinner than regular DIMMs, and the 204-pin SODIMM PCBs are always ~2. Example: because the latency in nanoseconds for DDR4-2400 CL17 and DDR4-2666 CL19 is roughly the same, the higher speed DDR4-2666 RAM will provide better performance. 8V ± 0. 5, 2, 2. DDR2 Page 9: A Quick Start: Corsair CM2X512 Page 10: PCI Express: Up To 8 GB/s Page 11: PCI Express Graphics Cards Page 12: PCI-X Vs. 12. DDR3’s prefetch buffer width is 8-bit which is double of DDR2. 80V Multi-channel Kit: Dual Channel Kit Parts: Lifetime limited Model #: KVR533D2K2/2GR Item #: 9SIBKYEK6R7455 Return Policy: View Return Policy $58. In general, faster DRAM is better. However, Latency is best measured in nanoseconds, which is a combination of speed and CAS latency. What Should I Do?The MIG 7 Series DDR2/DDR3/DDR3L controller, upon reset, completes a JEDEC standard compliant initialization sequence. Get a 3200MHz CL16, do not bother with this kit you are looking at. DDR SDRAM were originally produced at the 133MHz clock rate with a 7. 4. 2GB DDR3 Dual Inline Memory Modules (DIMM) are undoubtedly the. DDR3 Benefits. The prices are worlds apart, but how about the performance? If I have x2 512MB (1024MB) of. Additive Latency. TWIN2X2048-6400C3 delivers unparalleled memory performance at 800MHz and supports the industry's lowest latencies of 3-4-3-9 in this speed grade. Spike Posts: 2,122 +0. 6 ns latency (less). Whether an ACTIVATE command needs to. DDR2 SO-DIMMs are not compatible with DDR1 DIMM and DDR2 DIMM memory modules. Over 8,300 RAM models benchmarked. So my assumption was that read_frq = 650Mbps / 32bit => (650*1024*1024)/32 => 21. DDR is better because it has lower latency than DDR2. While memory speed (or data rate) addresses how fast your memory controller can access or write data to memory, RAM latency focuses. 80V Multi-channel Kit: Dual Channel Kit Timing: 5-5-5-18 Model #: 996558 Item #: 9SIA1K6JJZ9450 Return Policy: View Return Policy $24. DDR2 800MHz or 667MHz are the common speeds avaliable for the LGA775. 99. The timings are 5-5-5-15. There is an exception to this general rule, must compare latency between similar DDR technologies for a fair comparison. so basically cl3 ddr2-400 has the same latency as cl6 ddr2-800 would, and same as cl5-667 , cl4-533. DDR5 Memory List. Furthermore, the majority of DDR4 chips have somewhat greater latencies. 03. 99 –A-Tech 1GB DDR2 667MHz SODIMM PC2-5300 Non-ECC Unbuffered CL5 1. The device handles that just fine. However, because of its faster clock speeds, the newer standard has better performance overall. Timing Diagrams for UniPHY IP x. Free Shipping. organization. DDR3 SDRAM LATENCY 11. 99 –CAS Latency: 7; Model #: M-M-3012 B001A5PR1G;. PCI ExpressSimmTester. 99. . In addition, Corsair was very clear that this PC2. 7ns, and actual to core latency is closer to 60ns+ on the slow kits and 50ns is on the good 6000+ kits with tight timings. The write command at sample 140 has its data on the bus starting three DDR2 clock cycles later at sample 143. 4GB:performance. Timing Memory timings (or RAM timings) refer collectively to a set of four numerical parameters called CL, tRCD, tRP, and tRAS, commonly represented as a series of four numbers separated with dashes, in that respective order (e. The timings are indeed related to the performance of your PC and a proper. 80V Multi-channel Kit: Dual Channel Kit Timing: 5-5-5-18 Model #: 996558 Item #: 9SIA1K6JJZ9450 Return Policy: View Return Policy $24. 88 –MemoryMasters 8GB (2x 4GB) DDR2 667MHz PC2-5300 PC2-5400 SODIMM CL5 200-Pin 1. Sponsored. Add to cart. DDR3 DIMM:. DDR2 introduced with the Intel i925X chipset and i915. DDR2-800 CL5 has an actual latency of: 1/0. D. CL minimum value is time based, but it is counted in clock cycles. DDR3 stands for Double data rate type three. • In DDR2 memories, depending on the chip, there is an additional latency (AL) of zero to five clock cycles. DDR2 RAM will have a higher CAS latency than DDR. OCZ DDR2 Memory comes in quite a range: from classic XTC to the watercooling capable FlexXLC to the latest Reaper HPC modules. DDR2 SDRAM write latency is the read latency minus one. Shifting over from DDR4 to the DDR5 results on Alder Lake, at JEDEC speeds, comparing DDR4-3200 CL20 to DDR4-4800 CL40, the officially supported speeds of the chip, we see memory latency only go. CL minimum value is time based, but it is counted in clock cycles. CAS latency of 9 at 1000 MHz (DDR3-2000) is 9 ns, while CAS latency of 7 at 667 MHz (DDR3-1333) is 10. Given that the average human reaction time is around 0. Below we summarize the most. Compare. CAS Latency: 4 Voltage: 1. 8V, while DDR3 is lower at 1. Consider this. 2. The results also show that once DDR3-1600 memories are released. Additive Latency. 533 cycle = 1. 00 Rebate Program #03290713 Dual Channel 2 GB PC5300 DDR2 Low Latency Kit Receive a maximum of one rebate with the purchase of the advertised Patriot memory product from Global Computer Supplies, Tigerrayman2k2 Supreme [H]ardness. Memory bandwidth that is advertised for a given. However, DDR2 SDRAM memory has greater latency than DDR SDRAM memory. PCI ExpressBenchmark Suite: PCMark 8: Version 2. Thus, READ Latency (RL) is equal to the sum of AL and CAS# latency (CL). Compare. 80V Buffered/Registered: Unbuffered Model #: NP170 Item #: 9SIAD8UJV01439 Return Policy: View Return Policy $63. DDR2 SDRAM Mode Register Set (MRS) The mode register stores the data for controlling the various operating modes of DDR2 SDRAM. And yes, bandwidth has increased a lot more than 18% from DDR. What are memory timings? When the topic of memory performance comes up, most people usually think of a memory module speed. DDR2 and DDR3 are superseding versions of the DDR spec. CAS Latency: 6 Voltage: 1. The better memory test programs (above) use bootable. 2992 MHz => aprox 47ns (read access time for one 32bit word). clock speed is an actual speed. In general, read latency varies based on several parameters: Note. Latency: Also known as “timings,” latency refers to the number of clock cycles to complete a read/write task for. This is enabled/disabled through the ORDERING parameter. 8GB (4x2GB) DDR2-800MHz PC2-6400 Non-ECC UDIMM 2Rx8 1. 5: 3+, 4, 5:A-Tech 2GB DDR2 667MHz DIMM PC2-5300 UDIMM Non-ECC 1. Both speed increases and latency decreases result in better system performance. CAS Latency: 5 Voltage: 1. 12. It controls CAS latency, burst length, burst sequence, test mode, DLL reset, WR and various vendor specific options to make DDR2 SDRAM useful for various applications. The write latency is one clock cycle less than the read latency. Title really says it all folks. For a DDR400 CL3 module, the latency in nanoseconds is calculated as follows: Latency/ns = T X CAS Where T is the period of the clock cycle, and CAS refers to the latency in cycles. So higher CL = slower clock cycles, so effectively your 3200MHz ram would perform closer to that of a 2133-2400MHz CL16 kit. PCI ExpressMushkin Enhanced Silverline 4GB (2 x 2GB) DDR2 667 (PC2 5300) Desktop Memory Model 996756. Currently. CAS Latency is 5: Definition. 5 of JEDEC Specification JESD79-2 DDR2 SDRAM Standard (in the "Bank activate command" section). RAM Type (ECC vs Non-ECC, Registered vs not, Buffered vs not) Minimum speeds on a board that cannot adjust the memory frequency. DDR2-533,-667. However, the original DDR technology normally tops out. MemoryMasters 8GB (4X2GB) DDR2 667MHz PC2-5300 ECC FB Dual Rank 2Rx8 FB-DIMM. Device Operations DDR2 SDRAM Basic Functionality Read and write accesses to the DDR2 SDRAM are burst oriented; accesses start at a selected location and continue for a burst length of four or eight in a programmed sequence. With a computer running at a system bus of 533 MHz or 667 MHz, use a. In general, the lower the CL, the better.