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I did some overclocking experimentation on Friday.  I would change settings, run memtest through one full test cycle, and then boot into Vista and run SuperPI for 2M digits.
Here are the results:
I had read that tightening memory timings makes a bigger difference in performance than increasing memory speed.
I went from 5-5-5-18 @ 800MHz to 3-3-3-8 @ 533MHz and saw zero performance loss.  There wasn’t a performance gain either, but it’s still impressive when the speed is cut by 33% and the performance stays the same. In changing this though, I also changed the FSB/RAM ratio to from 5:4 to 1:1, which also would increase performance.
I then started moving up in speed until I hit the point where my memory couldn’t handle those timings anymore. It turned out to be 600Mhz. That gave me a nice 300Mhz processor overclock with no noticeable stability problems.
Just for fun I saw how high I could go with 4-4-4-12 timings. I turned out that I couldn’t go much faster; just 667Mhz. That put my CPU right at 3Ghz and made things a little unstable. I don’t know if it’s my motherboard just not liking the faster bus speed (moving from 266Mhz to 333Mhz is a pretty big jump), or the processor being from a bad batch, but the system just wouldn’t reliably boot at those settings.
I think I’ll try again tonight. If I can’t make it any higher, I’ll call it a day and leave it set at 600Mhz.
Obviously the optimal overclock would be setting the FSB to 400MHz, to keep the 1:1 ratio yet keep the memory within spec. If my processor can’t keep up at that speed, I could always decrease the multiplier to get it back at a healthy speed.  But if the motherboard can’t handle 400Mhz, then the whole thing is pointless.
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