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Phenom II X4 955 BE Unstable @ 3.8Ghz, Need Help - Page 2

post #11 of 14
@OP

Let me clear this up for you.

For starters, you can push your CPU voltage all the way up to 1.55v. You can even go higher if you have a decent cooling solution. You can push your CPU/NB voltage to 1.5, again, as long as you have a decent cooling solution. That being said, keep along.

Some chips will require more voltage at higher clocks; some require 1.45v+ for frequencies exceeding or near 3.8Ghz and some less as it's all dependent on the chip (and motherboard too). For your CPU/NB, most chips will vary from 1.3-1.5 depending on how high you push the clock. Some chips can do high clocks at lower voltages (the CPU/NB that is), but not all are able to get them with low voltage.

In terms of what's what - you need to leave your NB voltage alone (note: CPU/NB voltage and NB voltage are two separate things). The only time you want to push your NB voltage is in two cases: unstable RAM or unstable HTT (baseclock/reference clock). Generally speaking, most motherboards are fine with the NB voltage left on auto. The default voltage will vary from board to board but the NB is usually at 1.1/1.2.

For your CPU/NB, it's recommended to go all the way up to about 1.45v for your desired clocks. For 2800 (CPU/NB) you may need this kind of extra voltage and you may not. Again, it depends on the chip.

Most likely if you're unstable at 3.8Ghz, it is because you're CPU/NB does not have enough voltage, and/or your CPU vcore may need a boost above 1.45v.
    
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post #12 of 14
Thread Starter 
Ok so my testing with: 215 BUS, 18x ratio, CPU/NB Freq @ 2580MHz, CPU Voltage @ 1.475v, NB Voltage @ 1.28v, CPU/NB Voltage @ auto, HT Link @ 2150, DRAM Freq @ 1433Mhz, Timing at stock (9-9-9-24-2T), HT Voltage @ auto RESULTED IN crash after 22 min

I then tweaked the settings by changing: CPU/NB Freq from 2580Mhz to 2795Mhz, CPU/NB Voltage from auto to 1.3v, and HT Voltage from Auto to 1.22v RESULTED IN BSOD at Windows boot

I'm obviously doing something wrong... what do you guys think?
post #13 of 14
Thread Starter 
Quote:
Originally Posted by GanjaSMK View Post
@OP

Let me clear this up for you.

For starters, you can push your CPU voltage all the way up to 1.55v. You can even go higher if you have a decent cooling solution. You can push your CPU/NB voltage to 1.5, again, as long as you have a decent cooling solution. That being said, keep along.

Some chips will require more voltage at higher clocks; some require 1.45v+ for frequencies exceeding or near 3.8Ghz and some less as it's all dependent on the chip (and motherboard too). For your CPU/NB, most chips will vary from 1.3-1.5 depending on how high you push the clock. Some chips can do high clocks at lower voltages (the CPU/NB that is), but not all are able to get them with low voltage.

In terms of what's what - you need to leave your NB voltage alone (note: CPU/NB voltage and NB voltage are two separate things). The only time you want to push your NB voltage is in two cases: unstable RAM or unstable HTT (baseclock/reference clock). Generally speaking, most motherboards are fine with the NB voltage left on auto. The default voltage will vary from board to board but the NB is usually at 1.1/1.2.

For your CPU/NB, it's recommended to go all the way up to about 1.45v for your desired clocks. For 2800 (CPU/NB) you may need this kind of extra voltage and you may not. Again, it depends on the chip.

Most likely if you're unstable at 3.8Ghz, it is because you're CPU/NB does not have enough voltage, and/or your CPU vcore may need a boost above 1.45v.
Thanks for the clarification.

So you're saying I should put my CPU/NB up to 1.45v, and should I leave my CPU Vcore at 1.475v? As I mentioned earlier, there is some vdroop which results in the vcore never passing 1.405v when stressing under Prime95. Does that mean I should increase the vcore more so the vdroop won't drop as far?
post #14 of 14
Quote:
Originally Posted by theDARKW0LF View Post
Thanks for the clarification.

So you're saying I should put my CPU/NB up to 1.45v, and should I leave my CPU Vcore at 1.475v? As I mentioned earlier, there is some vdroop which results in the vcore never passing 1.405v when stressing under Prime95. Does that mean I should increase the vcore more so the vdroop won't drop as far?
What I'm saying is to work on your overclock step by step, increment by increment. Don't just throw voltage at the problem.

If your CPU/NB is 2500~ try 1.35v on the CPU/NB, then try 1.375, then 1.4v etc. The same goes for your CPU vcore. If you're drooping to 1.4v under load when your BIOS is set to 1.45v for your CPU vcore, you may well need more voltage for 3.8 under load (Prime95).
    
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