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There is no advantage in anything overclocking the HT link. Keep it around 2000.
CPU MHz is king. Never give any away for memory timings or speed.
NB frequency does help in some things, but not so much in real world usage.
2600-2800 is comfortable on Thuban's.
Memory speed and timings you'll have to play with. Typical AMD is tight timings over speed, but I personally wouldn't go slower than 1500-1600, and if you're going under 1600 you better be at CL7 or less.
1600-1800 is the sweet spot on Thuban.
If you're down to 1333MHz, you better be at CL6 or it's not worth the loss in speed.
1.5v ain't that bad as long as you can keep it cool. Rule of thumb is no more than 1.55v on ambient and you have to stay under 60c. Lower would be better if you can find the means.
What Mr. Scott said and 1600MHZ ram will not effect top clock speed of the CPU. Here is an example of an ideally configured Thuban (on air):
-CL7 1600Mhz RAM
-2800-3000Mhz CPU-NB @ 1.3-1.35v (no more than 1.4v)
-2000-2200Mhz HT (no performance or reliability boost from increasing HT speed)
In finding the sweet spot of your CPUs MAX clock, keep your FSB at 200, set your core voltage to 1.485 and try for 3.8Ghz. If it's not stable just dial it back 100Mhz and call it good.
Does the computer POST at all with your CPU @ 4.0Ghz? If your heart is really set on the magic 4.0 number you might try 4.0Ghz @ 1.515v core and forego the torture tests. It is quite often the case that you may still have a reliable system that runs all the games and programs you need, just doesn't pass 2 hours of prime. And that's totally A-Okay in my book if you have solid reliability for your purposes. What type of cooler are you running? What are you seeing for peak temps?
I've been following along for two pages. Now bookmarked for the coming weekend, when I hope to join in the PII X6 shenanigans.