I'm an experienced O/C'er running a new Phenom II 955 with AMD's 790x chipset in the Gigabyte GA-MA790x-ud4p mb which supports AM2+ and AM3. I was able to increase the ref-clock to 266 MHz straight away in the bios, dropping my multis accordingly to keep the cpu and mem at stock speeds (mem is DDR2 1066). The adjustment to 266 was without issues, and I have yet to test for the ref-clock ceiling on this board through the BIOS. The 266 setting is stable to long runs in OCCT and has become my default setup. Enabling/disabling CnQ makes no diff, but I disabled it to address the following problem.
If I return settings to AUTO in the BIOS, and try to create the exact same configuration through AMD Overdrive in Win7-64, the system freezes. I can change the multis okay, and then when I incrementally increase the HT-Link, the system gets flaky at anything over 260 MHz. :\
I've frequently read that the BIOS is better for O/C'ing than Win-based utilities, but this is the clearest example of it I've encountered. Yet I've seen so many reports of people successfully using AOD for their overclocks, I'm wondering if I'm missing something. The Gigabyte O/C features are fantastic EXCEPT that it doesn't have a fail-safe mode for boot failures - one has to short pins on the mb to clear cmos which is a PITA. So it would be convenient to find my limits with AOD, but this problem makes that a no-go. FWIW, AOD starts up fine with the clock set to 266 in the BIOS.
Anyone have any explanations\suggestions?
BTW, heat's not an issue: cpu idle = 30C; Load = 48C.
If I return settings to AUTO in the BIOS, and try to create the exact same configuration through AMD Overdrive in Win7-64, the system freezes. I can change the multis okay, and then when I incrementally increase the HT-Link, the system gets flaky at anything over 260 MHz. :\
I've frequently read that the BIOS is better for O/C'ing than Win-based utilities, but this is the clearest example of it I've encountered. Yet I've seen so many reports of people successfully using AOD for their overclocks, I'm wondering if I'm missing something. The Gigabyte O/C features are fantastic EXCEPT that it doesn't have a fail-safe mode for boot failures - one has to short pins on the mb to clear cmos which is a PITA. So it would be convenient to find my limits with AOD, but this problem makes that a no-go. FWIW, AOD starts up fine with the clock set to 266 in the BIOS.
Anyone have any explanations\suggestions?
BTW, heat's not an issue: cpu idle = 30C; Load = 48C.
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