I have a Q6600 at stock and 4GB of 800MHz Kingston ValueRAM. Mobo is ASUS P5N32E SLI +
Set the FSB to 1333MHz, Memory @ 667, Vcore at 1.31V in BIOS
Windows 7 works fine, Prime runs stable for 4 hours, but Assassins Creed 2 crashes after about 10 mins.
Now, I noticed that when I changed the memory speed to 667MHZ, CPU-Z said the timings changed from 6-6-6-18, to 5-5-5-15. Also noticed that Vcore was 1.22V, which I am thinking is due to Vdroop of +/- 0.1V
Do you reckon the system instability is caused by a low Vcore after Vdroop, and I should be setting Vcore in the BIOS to 1.38V ish, or just plainly that Kingston ValueRAM is unstable when you change the timings?
Your Vcore will be lower do to speed step and some of it can be do to VDroop too. Your rams timings will change with its speed in auto mode the SPD usually has a few setting for different speeds. The lower the mhz of the Ram the tighter the timings can be run. Definitely run MeMtest to check your RAM.
On Prime95 what test did you run did you run the blend test because that will test your memory alot. Another good test which I find will find errors alot quicker is OCCT.
Yeah ran MEMtest on this memory not long after I bought it, 0 errors.
Increased Vcore to 1.36 in the bios, which give 1.265V after Vdroop in CPU-Z. Game didn't crash
However, When I tried an FSB of 1423, with 1.4Vcore in the BIOS, the machine BSOD on me just after windows loading screen, page fault error (memory related I guess)
This memory runs fine at 800MHZ, so I have no idea why it wouldnt run at 712 in sync mode. Voltage of DDR2 in CPUID Hardware monitor is 2.14, which seems quite high, and from what i can gather, shouldn't be any highter on value-ram.
Limited to to RAM speed by board. ASUS P5N32E series, max it will support is 800MHZ DDR"