The system works well, Photoshop now can access a good chunk of memory, excellent.
But, trying an overclock the same as before and the system fell over. I couldn't even get into the the OS (both XP and Vista) again and trying a new install couldn't even do that.
Figures in SetFSB (before it fell over on the next bump up, although was a bit unstable)
Panicked, went out side and thought it through and pulled out a couple sticks of RAM and tried a restart and system booted up and into Windows. Put the two sticks back in and system booted and into Windows.
All is fine.
But I would still like to try an overclock again.
My question (finally) is about the RAM.
Did the new RAM fall over because it was overclocked ? (I suppose it must have as it runs fine now).
If I set the new RAM of 800MHz to 667MHz in the BIOS (which looks possible) any overclocking through SetFSB would not be pushing the RAM above 800MHz but above 667MHz, so any overclocking of the RAM through SetFSB would then be less likely to make the RAM fall over ?
Put another way, does underclocking RAM make for more stable RAM when overclocking the CPU ?
Can you set the frequencies in the bios?
If so, that is usually preferrable to doing it through windows. If you can do the overclock in the bios, there should also be a way to set the ratio of the cpu fsb to the ram speed.
For example running the fsb at 333mhz (333*9 = 3ghz), a ratio of 5:6 or 1:1.2 would run the ram at 800mhz.
I have the same ram and processor, and it overclocks just fine
edit: Also, does setfsb let you change the processor and the ram frequencies separately? or are they linked?
Looks like setfsb forces you to overclock the ram and cpu together. I don't know what to do in this case, as my bios lets me adjust the two separately, so i can leave the ram at close to stock frequency.
If you can't overclock from the bios, there is probably someone here who has more experience with setfsb.
I have no experience with it so can't be much help there myself.
In SetFSB I set it to 320.0/640.0/100.0/33.3MHz which gave me a DRAM Frequency of 399.8MHz and 5/5/5/15 clocks in MemSet 4.0 and CPU-Z.
The Q6600 is now running at 2873.0MHz.
No stability problems, runs great. Tests and benchmarks good.
I made a punt that if the DRAM frequency didn't exceed the figures in the SPD section in CPU-Z (400MHz), which I guess I was before, things should be fine. That may not be the case at all as I know very little about this whole shebang, but whatever the reason, it has now been working great for a week.
irkjab, again, thanks for taking the time to help me out.