Originally Posted by go4life
the fsb and multiplier is what sets the speed, so try 1600fsb and 8x multiplier, that should give you a 3.2ghz for a start
and set ram to unlinked for now!
you are right that the max ``safe`` volt for 45nm's is 1.3625v, but the thing is, motherboards have a vdrop, so when you set your vcore to around 1.4v, it will actually be closer to 1.35-1.37v in real time! (this depends on the motherboard, also you can check your vcore in cpu-z, it will show what you actually have)
Okay, something's wrong after going from 3.1 GHz to 3.2. I used the suggested E8400 settings with Vcore at 1.3875 (there's no exact 1.39 option in the BIOS), NB 1.4, HT 1.4, SB 1.5. The only one we didn't talk about is the DRAM voltage. My RAM spec is 1.8, and the lowest setting is 1.85, so I used that one. Memory is unlinked at 800 MHz.
I was able to boot into XP, but 3DMark06 crashes during the CPU test. Prime95 runs mostly okay for a few minutes, but it appeared that one of the cores shut down once. That can't be good. Real-time Vcore ranges from 1.31 to 1.34. My maximum temperatures as reported by SpeedFan are shown below. All of the offsets are zero, so these are raw numbers, and I've converted them to Celsius for your convenience.
Core 0: 57
Core 1: 50 (the one that stopped running after a while)
Core 2: 54
Core 3: 54
For comparison, here are the slightly cooler temperatures at 3.1 GHz, where I had no problems with 3DMark06, Prime95, or anything else:
Core 0: 56
Core 1: 53
Core 2: 49
Core 3: 53
And max temps at stock 2.66:
Core 0: 53
Core 1: 49
Core 2: 50
Core 3: 45
I think people tend to keep things much cooler than necessary, but even I
realize that 70+ is pretty hot. And if the CPU is at 76, the cores are probably hotter than that. So unless there are other opinions, I guess I've hit my overclocking limits without better cooling, though I'm using an Arctic Cooling Freezer 7 Pro that's supposed to work fairly well. Before going any further I'll try the stock cooler and/or Arctic Silver compound for comparison, though I've found the choice of thermal paste to make almost zero difference.Edited by Quatrix - 3/22/09 at 7:05am