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Corsair TwinX1024-3200C2Pro Timing Question


MikeSp

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These two DIMMs are used on a Asus P4C800-ED motherboard with an Intel 3.2 GHz Northwood. When the BIOS is configured to allow their timings to be automatically set by SPD, the timings are 2.5-3-3-8 and 4. I have manually set the timings to 2-3-3-6 and 4 (at which they are rated) and the system is stable. BUT, am I getting a true 1:1, 800 MHz FSB with the 2-3-3-6 timings? With the timings set manually in BIOS as 2-3-3-6 here are the results of three system analysis programs: Using CPU-Z, the frequency is indicated at 199.9, FSB DRAM as 1:1 and timings as 2-3-3-6 With PC Wizard, under Chipset, the FSB Speed = 199.9, Bus Speed = 799.6 (QDR) and Memory bus speed = 199.9. TYPE: DDR-SDRAM PC3200, Frequency 200 and timings of 2-3-3-6. Under DIMM A1 it indicates CMZ512-3200C2 with supported frequencies of 166 MHz and 200 MHz with clocks of 2-3-3-7 each at 166 MHz or clocks of 2.5-3-3-8 each at 200 MHz. The same info for DIMM B1 obviously. With AIDA32: FSB Properties = real clock 200 MHz (QDR), effective clock 800 MHz and bandwidth 6400 MB/s. Under SPD it shows the highest CAS latency of 2.5 (5.0 ns at 200 MHz) and the 2nd Highest CAS Latency of 2.0 (6.0 ns at 166 MHz) The data about the tighter timings at 166 MHz vs the looser timings at 200 MHz are confusing to me. Does this mean that at a CAS 2.0 (at which these DIMMs are rated) they are only running at 166 MHz? If that is true, then the FSB is not running at 800 MHz but at 664 MHz and I have not achieved the 800 MHz FSB and 1:1 that I desire. Do I manually set the timings in BIOS at 2-3-3-6 as the DIMMs are rated or allow the BIOS to automatically apply timings as determined by SPD? Why the mention of 166 MHz above? I really am confused and I guess this first P4 computer build for me has raised a few questions. Advice to set me straight will be appreciated. MikeSP
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  • Corsair Employee
All of our modules with the C2 designation will have their SPD set JEDEC defined values for the IC that we use for that specific module and in this case that would be Cass 2.5-3-3-8 at DDR400 and Cass 2-3-3-6 AT DDR333! The tested settings would need to be set manually for any module with a C2 at the end!
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