Well I just got a system today and I'll let you know my results.
It's a P4 Northwood 2.6GHz @3.25 1.525V IDLE
MSI Neo2-PFS 865PE
512MB DDR500 Geil... runs @ 2-4-4-6
28C IDLE / 46+C @ LOAD
I'm using stock cooling with a GeForce TI 500 Video Card
I have my voltage set to 1.525 for CPU
2.65 for the Dual Memory
1.65 for my AGP
I believe in the Bios I set it to Ultra Fast, not Turbo though.
I was able to hit 3.45GHz, but it would lock. It would run around 3.35GHz, but after running a burn-in program for about 5 minutes, it would crash the program, but the system never rebooted.
I under clocked the ram to 333 and clocked it up to 400.
I even tried going as low as 266, but my results were worse. I have not tried every conceivable option, but I'm pretty sure I can't muster out much more. I did not try to set the ram to 433 or higher and then change the FSB, I think that's the only options I did leave out.
Also, I turned on the settings in the BIOS to manually change the voltage. It seems to me that even though I used Core Center, it would not change my voltage to what I wanted. I also never tried to bump up my Voltage on the CPU... I would rather leave it lower to reduce heat and extend the life than try and make it more stable. I guess if I was interested in finding out the maximum overclockablility of the CPU I could, but that would take more time, patience and testing.
I turned spread spectrum off.
Basically you just have to read and test your configuration.
I'm not sure what was causing my system to crash... Before I changed some settings I was running earlier...
http://www.bimmerinfo.com/overclocked.jpg < as you can see I was hitting 61C with my high voltage settings... hah I said I didn't change any, but this was when I just started and after I moved it to 1.525, I never changed it back.
Here are some photos of the Geil memory settings:
http://www.bimmerinfo.com/geil.jpg
http://www.bimmerinfo.com/geil2.jpg
Here is a picture showing how quickly my temperature would drop after running prime95 or another stress testing program. 46+C @ load to 28C @ idle.
http://www.bimmerinfo.com/temps.jpg
Here I show that I was able to hit 3.406GHz notice the 27C idle
http://www.bimmerinfo.com/overclocked2.jpg
and here I raise it even higher @ 3.457GHz
http://www.bimmerinfo.com/overclocked3.jpg
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This is all done with a stock P4 heatsink and fan... I will add that the case has 1 front fan, 1 rear fan and a large 120mm fan directly facing the P4 chip and heatsink. What I'm getting at is I'm not using any special heatsink/fan combo, just an extra fan basically.
Anyway I hope some of this info helps.. I just read a lot by googling and just browsing and reading away.. it also helps to have hardware that likes you =)