Originally posted by: DLeRium
Originally posted by: foodfightr
I have my opteron 165 running at 1.8Ghz @ 1v and 2.7Ghz @ 1.36v and rightmark will automatically switch between these two configurations to keep the temperature down when the extra juice isn't neccesary. 100% prime & 3d stable.
Here is what I'd do if I were you.... test your opteron at stock voltage and gradually increase the HTT and prime for 10-20 minutes minimum. Repeate this until you need more voltage, then try to slowly add voltage until it is stable.
I'd say 1.35v-1.4v is very safe, 1.4v-1.5v is moderately safe, 1.5v is risking it a little and 1.6v+ is suicide. Keep your temperatures under 60^C.
Also if you posted your stepping you may be able to get an idea of what your chip is capable of.... On the chip itself (ONLY HERE) it will say CCBWE 0xxx xxMW, for example CCBWE 0550 UMPW. Post this and I might be able to shed some light.
ALSO!!! Very important... set your CPU Multi to 9x (not auto) and your LDT Multi so that (LDT Multi * HTT) <= 1000.
Honestly, if you have to raise your voltages past 1.5 and not get a decent overclock, you have a crap Opteron. I have hit 1.55 volts before on my old Opty 170, and it could only yield 2.66 ghz. Temps were skyrocketing into 55 for load, and definitely not good. It took me like 1.7 volts or more to hit 55 for load on my old 3700+.
Voltages shouldn't be an issue in Opterons because the general rule is to keep them below 1.6. You won't be going that high on air because temps will be through the roof.
My own Opty is clocked at 2.5 ghz (250 x 10) and I have my ram running 250 3-3-2 according to the OCZ specs (I can't get CAS 2.5 like Anand does), and it's a smooth running system.
That said you do have a much better opteron than I do. I have to crank up 1.4 volts to keep it stable. Even though I primed 10 hrs stable at 1.4, I run my opty at 1.425v just in case. Also I keep a little more air cooling on than I did at testing stages. Anything to ensure 100% stability =)