Phenom II x4 955BE Vcore voltage?

Jay85

Jay85

Jay85

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What should my Vcore be at roughly if overclocked to 3.8? I currently have my cpu voltage set to auto and Cool n Quiet enabled. I tried with cool n quiet disabled but the voltages linger around 1.502-1.520 which is above the recommended level for this cpu.

Now i want to set the cpu voltage to manual and i noticed it incremets at 0.00625v i think.. correct me if thats wrong please.

Anyone know a safe or rough voltage to work from?

Jay
 
I was running mine on 1.300V at 3.6GHz (stock VID is 1.35V). Best piece of advice would be to stick it at stock volts (1.35V), and see whether it needs altering from there.
 
Okay i'll try that, do i just keep the cpu multiplier at x19 for 3.8ghz and just up the voltage accordingly until its stable?
 
I got a hard crash at 1.35v which is the standard vcore voltage so i upped it to by 2 increments and it seems to be stable for now but wont know for sure until i run some tests.

Get back to you soon.
 
It crashed all the way upto 1.475v and now its running prime95 without crashing... so far. Going to leave it running for a few hours and see how it goes.

Although i dont get this, the voltage is set at 1.475v right? But when all cores are at 100% load the Vcore drops to about 1.42v? Why is this?
 
Normal Vdroop.

You need to go into BIOS and set your Load Line Calibration to either 16% or 19%.

You will probably find you can drop your Vcore down to ~1.425V then as you won't be having to set it high to compensate for the Vdroop.
 
I'll try that because prime95 crashed after 10 mins into the test!

Is there anything else i should be adjusting for taking this route?
 
I have mine at 3.8 but vcore is at 1.5 :( i tryed lowering vcore but this is the lowest vcore settings i could find. :(
 
Same, i tried going manual with the vcore and adjusted it increment by increment and testing at each level but still i had to reach 1.475 before it was even able to run prime95!
 
It's normal. The 955s just don't like 3.8GHz that much.

I had mine at 3.75GHz, at about 1.35ishV, stable (used 250x15), but 3.8 was never stable for me.
 
I have the C2 version of the chip and I can manage 1.4v at 3.6 ghz stable. Getting to 3.8 needs at least 1.5v or more to run prime. This taxes my hyper 212 plus too much and will probbaly go over 62 degrees as a result. These chips are generally poor clockers compared to the intels.
 
Multiplier @ x19 = 3.8GHz with 1.475vcore

I did have problems getting it stable i found out that it didn't like my ram timings i set in the bios which i was setting them to the settings which is on the box which for me is DDR2-800 MHz's @ 4-4-4-15 @ 2.1v
Once I'd set them to auto its 100% stable :)

It might be your memory timings but generally keep upping the vcore on CPU but don't go over 1.550v
 
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ive got an unlocked phenom 555 quad, sitting at 3.85 with 1.4v. From what ive been hearing, I think ive got a particularly good one, but if i go higher, then the required voltage just shoots up (ie, 4ghz takes 1.525v, 4.05ghz is unstable at 1.55v, and i darent go any higher)
 
Richy1204 said:
Multiplier @ x19 = 3.8GHz with 1.475vcore

I did have problems getting it stable i found out that it didn't like my ram timings i set in the bios which i was setting them to the settings which is on the box which for me is DDR2-800 MHz's @ 4-4-4-15 @ 2.1v
Once I'd set them to auto its 100% stable :)

It might be your memory timings but generally keep upping the vcore on CPU but don't go over 1.550v
Click to expand...

Hmm i was thinking that aswel, after one of the crashes it did a memory diagnostic aswel. But i haven't tampered with the memory timings...

I'll try the load line calibration and see how that works.
 
Right i've set load line to roughly 19% now and it booted up okay and i am now running prime95. Just finishing the first 10 tests and been going for 15mins now. All seems well so far... Wish me luck! lol
 
Okay this is weird.. My temps were approaching 62C but then i noticed a drop in voltage down to 1.12v in which my temps then dropped to 57C! Now its dwelling around the 58-59c marker at full load using prime95... What the hell is going on?!
 
Quick question about LLC, does having a high percentage LLC damage your cpu? I have it on 19% at the moment at 1.4625v as at 16% it started to feel unstable before i even ran prime95. I was just thinking i may be able to drop my Vcore even more if i increase the LLC. But before i do i just want to know what the risks are by doing so?
 
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