I've got an Athlon II X4 630 (Propus) on a Biostar TA790GXBE with 2 sticks of Corsair Dominator DDR2 1066Mhz RAM and a HD6950, which works fine at 1066Mhz with 5-5-5-15 timings or 800Mhz and 4-4-4-12 timings (both at the board's default 1.95v).
I can successfully overclock the FSB from 200 to 240-250 and have no problems booting or passing any tests, but when I try and resume from standby, after briefly seeing the desktop the PC resets and I get a POST error message which says "Too many cold reset due BIOS POST. System might be incorrectly overclocked". This happens even if I only try setting the FSB to 205. I've checked and it happens with both XP and Win7. I've just installed a TRUE Rev.C heatsink, so the CPU temperatures are nice and low.
When overclocking, I set the RAM to 667Mhz and the HT-Link to 1.6Ghz to prevent those being overclocked. Spread Spectrum is disabled and PCI-E clock and SB Reference Clock are set to 100 Mhz. Onboard IGP is disabled.
I've tried upping the CPU-NB VID one notch from 1.1775v to 1.1875v, which with the CPU-NB Over Voltage +0.05v setting brings it to 1.2375v. The BIOS reports it as 1.26v and there's nothing in Windows that will show this value (AMD OD/HWiNFO only shows 1.1875v, not the true value). At the setting of 1.1775v (+0.05v) the BIOS reports about 1.249v
After that didn't work, I also tried upping the Memory Over Voltage (the only RAM voltage setting) from 1.95v to 2.05v, but that didn't help either, so I've bumped those back down again for now.
My other settings are:
CPU Vcore +0.05v (also tried leaving it on Auto)
CPU-NB Over Voltage +0.05v (also tried leaving it on Auto)
Custom P-States: (also tried leaving it on Disabled)
Core FID x14 2800 Mhz
Core VID 1.4v
Core DID Divided by 1
NB VID 1.2v
NB FID 2000Mhz
NB DID Divided by 1
SVID Override Disabled
Memory Over Voltage 1.95v (this seems to be the only RAM voltage setting)
Chipset Over Voltage 1.25v
HT Over Voltage 1.2v
BIOS info screen shows (at FSB240*14):
CPU Speed 3360Mhz, NB Clock 2000Mhz, ncHT Speed 1600Mhz, Width 16/16bit
CPU Vcore 1.456v, Chip Voltage 1.232v, DDR Voltage 1.952v, HT Voltage 1.232v
I've uploaded the BIOS manual to http://kvisit.com/Spdm3AQ
. Hopefully someone can help me sort this, as it's driving me mad not being able to overclock