I'm not having much luck overclocking this CPU on this board at all.
Previously, on a Biostar TA790GXBE I was able to set the FSB to 230 to get 3.22Ghz @1.456v, with the DDR2 RAM at 460/920Mhz and it managed 5 passes of IntelBurnTest OK. I might have pushed it further but that's all the notes I have.
Now I've got 8GB of Crucial 1600Mhz DDR3. I'm using a Xigmatek HDT-D1284 top-down cooler and temps are all under 42c.
So I've tried setting the RAM to Auto instead of 1333Mhz, which with a FSB of 230Mhz it sets to 960Mhz and I've also tried setting the timings manually to match the table for 1066Mhz, 6-6-6-18, (otherwise it seems to use the timings for 800Mhz, 5-5-5-15 which I guess might be unsuitable at 960Mhz).
I can POST at FSB 230Mhz but Windows BSOD on boot. Even at 220Mhz with manual timings it doesn't POST reliably and the fans runaway sometimes. It actually seems more unreliable with the manual timings, which doesn't seem to make much sense.
My board has a setting "Load-Line Calibration - Auto" and says when manually overclocking it should be set to 1/2 for AM3+ and Disabled for AM3, so I've been setting that to Disabled. Spread Spectrum I've left on Auto. I'm using the onboard HD4250 but the PCI-E is set to 100Mhz so I assume that the GPU shouldn't be overclocked. Default clocks for the GPU are 500 or 560Mhz (stats for HD4250 show 560Mhz but GPU-Z showed around 500Mhz but maybe it was just downclocking at idle).
I've posted photos of the BIOS here:
More about :trouble overclocking athlon 630 asrock 880gmh u3s3
I've had some success using OC Mode - CPU Mode, which lets me select a percentage to overclock by. 5% tested stable with IntelBurnTest, so I tried 20% for 3360Mhz. That bumps up the CPU-NB to 1.25v despite underclocking it to 1920Mhz. It set the HT to 2100Mhz so I reduced that to 1920Mhz manually.
It set the CPU to 1.35v and the NB Core to 1.19v (default 1.10v) which seems strange as what I've read says to leave this alone. It set the RAM to 960Mhz. At those settings, IBT failed (well Linpack actually) on the first run, so I bumped up the CPU to 1.40v and that failed on the fourth run.
Temps were CPU 62, Core 62, MB 42. I believe the Athlon II X4 630 is rated for 71c but that's getting a bit close for my liking, so I'm not sure if I should increase the voltage to 1.45v. My CPU fan (on Xigmatek HDT-D1248 top-down cooler) ramps up from 1000 to 1400RPM at 50c and my front fan ramps up from 600 to 750RPM at 60c. My exhaust fan runs at a constant 750RPM.