Originally Posted by wiv678
Recently purchased a Athlon II X3 425 (2.7ghz) which I was rather hoping to turn into a quad core. Imagine my surprise that on setting ACC to auto it became a full fat 6mb L3 Phenom quad core. Great! After spending an hour or so messing about with the unlocked cpu I managed to hang the PC by running a cpu bench mark (Sis Soft) and opening Fire Fox at the same time.
After a few days of messing around a few trends have emerged. The PC won't boot up as the Phenom from cold. I have to load into Windows, then restart and even then there is only a 50% chance of it becoming the Phenom. The Phenom will always boot into Windows when unlocked and unless I am doing anything harsh is always stable. I have managed to play half life 2 ep2 for hours on it with no problems and I have also been able to encode hours of video with Media Ecode also. The unlocked Phenom (with stock cooler) will idle at 42 degrees and won't go above 59 under prolonged load. On occasion though, the unlocked Phenom will crash when attempting to encode video and the PC will have to be restarted.
All of the above has been achieved simply by setting the bios to ACC auto without a v.core increase (the stock v.core is 1.25v). I have changed the v. core to 1.35 but it doesn't seem to make any difference in the pattern above. Besides, I am only using the stock AMD cooler and the idle temp (without C n' C, which disables itself for some reason when the multiplier or v.core is modified) with the higher voltage is around 50 degrees. Is there anything I can do to get this cpu to work as a Phenom reliably? I can run the CPU at its default setting as an Athlon X3 oc'd to 3.3ghz stock voltage all day long so am not exactly disappointed that I can't run it as a quad. Here are my specs if it helps:
Athlon II X3 - 425 (OPN: ADX425WFGIBOX)
Asrock A780GM-LE/128 Bios v. 1.20
2gb OCZ ddr2-800
Nvidia 8800gs 384mb
Antac 380w psu
I think I would have been much happier if the damn thing wouldn't unlock at all (so I wouldn't have spent my free time obsessing about beating the problem), or that it would have just unlocked into a vanilla Athlon II X4. Am I chasing a ever receding horizon with the Phenom X 4 dream or sound I give it up and resume my life?
If anybody has any suggestions then they would be gratefully received, also if you need anymore info about specs or setting then just shout.
Mess around in the ACC manually. It sounds like either the 4th core or the L3 cache is bad, which is the reason it was sold as an Athlon II. Try upping the voltage a little bit more, and if it's still not stable, go back to your previous settings, and disable either the L3 or 4th core to find the culprit. But to be honest, if you're using the stock heatsink I wouldn't recommend upping the volts or overclocking. The AMD coolers aren't made for that.
Cool 'n' Quiet disables itself because while your system is idle it lowers your CPU multiplier, and dumps some voltage, and if you're beyond AMD's specs with clocks/voltage, it could cause your PC to lock up when CnQ kicks in.
Also, please post your system specs in the user control panel so people with suggestions know what they have to work with.Edited by Zeifer - 11/15/09 at 3:33pm