Ah, well then, you need to keep the RAM sticks at stock best possible. You need to test your RAMs capability before you start oc'ing because in your case, it sounds like your RAM is holding you back (settings found in Memset fully).
Find a setting with timings/subtimings/volts (sub 2.25V IMO) which makes your RAM fully stable (Memtest/Prime95blend/Systool 32M) at sub DDR2-1000. Then drop to a low RAM divider (1:1.33 is good) with those volts/settings and start oc'ing to find the max HT ref/GHz.
My RAM boots CAS5 DDR2-1450 at 2.35V perfectly, so when I'm testing HT ref./NB/HT/CPU I'm well clear of its limits, thus can know where the problem lies.
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1066 memory won't run, don't even try it, it will give you no boot and make yu clear CMOS before booting. Only some BETA BIOSes run it.
1.2 BIOS has the TLB errata patch enabled. If you want to try the latest BETA BIOS, it allows you to turn the TLB patch off (better performance) and allows running 1066 RAM. However, it won't run anything below 1066 RAM at stock HT ref. bootup, I'll warn you that much.
2.7G for 1.3V looks very promising although rare so far, sadly.
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