My computer's started behaving badly recently; it'll turn on with power light and fan, but no HDD activity and nothing on the monitor, and stay like that until the power is shut off. I've re-seated everything, and am inclined to think it's not a power supply problem as the computer will boot fine, and is solid as a rock, if I leave it for a while then try turning on again, but this only seems to work randomly. I've also tried returning my overclock to stock settings and it makes no difference.
specs as follows...
Intel Core 2 Quad Q6600 2.4GHz 95W G0, OC'd to 3.2 Ghz
Gigabyte GA-EP43C-DS3 iP43 Express Socket 775 Motherboard
ATi Radeon HD 4850 Overclocked 512MB PCI-E2.0
OCZ 4GB PC2-8500 Reaper HPC, OC'd to 5-5-5-18
Microsoft Windows Vista Home Premium 64 OEM
OCZ 700W GameXStream SLI Ready PSU
OCZ Gladiator Max CPU Cooler
As I said, the overclock is solid as a rock normally, and the boot problem persists when this is returned to stock settings. It's been running overclocked, fine, for 7 months.
It's annoying; as I'm on a few tight deadlines with video editing and don't have time to sit around hoping my pc will even POST.
I have the memory running at 2.2v at the moment. It was previously set to automatic after some stability issues when setting up the overclock 7 months ago, but I've set it manually after reading the 5-5-5-18 timings written on the side of the memory itself with 2.2v specified. I wouldn't want to raise it any further (mostly because I'm in the "pink" region of voltages according to my mobo, which is a tad worrying).
You're right, don't go above 2.2v. I was just making sure you had the voltage set correctly. Have you run Memtest86+ overnight to test for RAM errors?
I don't have OCZ RAM, so the voltages are lower. I currently have G.Skill PI Black RAM that runs at DDR2 800 with 4-4-4-12 timings at 1.9v. I've upgraded the RAM since I had the problems I mentioned, though. The G.Skill RAM has run flawlessly since I installed it.
The multiplier on the Q6600 is 9 is it not? Running your bus speed higher than it needs to be doesn't make sense to me. It shouldn't have issues with 355x9. As 355 will stress your board less, I think it's at least worth a try.
If your RAM is happy, that's OK, but it's not really improving overall performance.