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955 Voltage Issues

post #1 of 13
Thread Starter 
Hey guys,

I've been messing around with my voltages the last day or two. I can't seem to make my 955@4Ghz stable without pushing the Vcore to 1.47v with LLC enabled. Any ideas what is crashing? The screen crashes for a second and then my computer restarts.

Here are my current settings:

CPU Multiplier: 20x
FSB: 200Mhz
NB: 2600Mhz
HT: Auto
DRAM: 1600Mhz
Timings: Stock

CPU Vcore: 1.47v
CPU/NB Volt: 1.3v
NB Volt: 1.2v
DRAM volt: 1.65v - Stock listed on XMS3 box

My current temps with my RX360 kit is 33 idle and 47 max under 2+ hours Prime95. Ambient is 23.

So I have a little headroom as far as temps go. I just want to make my computer stable @4Ghz for 24/7 use.

Any help will be greatly appreciated.
Edited by modinn - 8/1/11 at 9:49am
post #2 of 13
When set to 1.47v LLC, what is the actual load voltage, as reported by CPUz?
1.47 LLC seems normal to me.

What crashes is the AMD display diver, most probably. It is very sensitive to instabilities.
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post #3 of 13
You could tone down the oc to 3.9Ghz, and maybe it will be stable with less Voltage. But as far as I know, people usually had these at 3.8- 3.9Ghz and had to have about 1.45V, so if yours is stable with 1.47V @ 4Ghz and you don't want any lower clocks I suggest you leave it there. 1.47 is still safe for AMD's and it's very good compared to what some people have for 4Ghz (over 1.5V).

Just keep temp's under 60C and ur golden imo
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post #4 of 13
Turn LLC to 1/4, save and exit, go back into the BIOS and see what the voltage says in hardware monitoring. That is likely to be your new load voltage.

And don't be scared of vdroop, it's part of spec...

I'd rather set 1.45v with droop to 1.416v under load than have to deal with nearly 1.5v all the time with LLC.

You won't need as much voltage under load with less LLC, but you might have to set it a tad higher if the load voltage isn't enough.
post #5 of 13
Thread Starter 
Quote:
Originally Posted by ronnin426850 View Post
When set to 1.47v LLC, what is the actual load voltage, as reported by CPUz?
1.47 LLC seems normal to me.

What crashes is the AMD display diver, most probably. It is very sensitive to instabilities.
Reporting 1.496v in CPUz at full load Prime95. Sometimes pulls down to 1.48v for a second or two in between datasets.

As far as I know, the display driver wouldn't crash my whole computer. Only the display right? Like the computer should still run, my display may go blank though. Correct me if I'm wrong.


Quote:
Originally Posted by markothevrba View Post
You could tone down the oc to 3.9Ghz, and maybe it will be stable with less Voltage. But as far as I know, people usually had these at 3.8- 3.9Ghz and had to have about 1.45V, so if yours is stable with 1.47V @ 4Ghz and you don't want any lower clocks I suggest you leave it there. 1.47 is still safe for AMD's and it's very good compared to what some people have for 4Ghz (over 1.5V).

Just keep temp's under 60C and ur golden imo
Yeah that's what I was thinking. I'm going to try to mess around with the voltages a little more and see if I can get it stable at 1.475v.

My load temps now are under 49 degrees in Prime95 and 54 when gaming.

Thanks

Quote:
Originally Posted by linkin93 View Post
Turn LLC to 1/4, save and exit, go back into the BIOS and see what the voltage says in hardware monitoring. That is likely to be your new load voltage.

And don't be scared of vdroop, it's part of spec...

I'd rather set 1.45v with droop to 1.416v under load than have to deal with nearly 1.5v all the time with LLC.

You won't need as much voltage under load with less LLC, but you might have to set it a tad higher if the load voltage isn't enough.
Unfortunately my BIOS doesn't have that LLC option. It is only for the Crosshair Formula series for ASUS boards. I have a Enable and Disable option.

But yes I agree, I need to make sure my load voltage with the LLC boost is hitting over what I need in case the vdroop decides to whimp-out on me for a split second.


+rep to all of you! Thanks for the suggestions!
Edited by modinn - 8/1/11 at 7:58pm
post #6 of 13
My 955 can do 4.1GHz (205 x 20) at 1.456V.

Max load temp with prime 95 is 52c.

Hope that helps.
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post #7 of 13
Quote:
Originally Posted by modinn View Post
Yeah that's what I was thinking. I'm going to try to mess around with the voltages a little more and see if I can get it stable at 1.75v.


Unfortunately my BIOS doesn't have that LLC option. It is only for the Crosshair Formula series for ASUS boards. I have a Enable and Disable option.
!
umm, mine isnt any crosshair or sidehair or curlyhair board and i have both auto and can specify % of llc.

isnt that too much voltage for even water ? i would think thats higher than youd use for a suicide run.
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post #8 of 13
Quote:
Originally Posted by pc-illiterate View Post
isnt that too much voltage for even water ? i would think thats higher than youd use for a suicide run.
That's what i thought also. I haven't been here long but that is the first time i have ever heard of someone saying they should go that high
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post #9 of 13
LLC options should be with your vcore options. You might need to specify fractions (1/4) or percentages (25%)

You can disable it and check your voltage in the BIOS like I said before, it is almost certain to be your new load voltage in windows, under stress tests. It was for me, anyway. If you disable it and can no longer boot, you will need to set the voltage higher.
post #10 of 13
Thread Starter 
Quote:
Originally Posted by snowninja88 View Post
That's what i thought also. I haven't been here long but that is the first time i have ever heard of someone saying they should go that high
Doh, I must've forgot the 4 in it.

I meant 1.475v haha. Yeah 1.75 would blowup the processor I would think. I think I have it somewhat stable at 1.44v+LLC now for some reason, running strong for 10+ hours with BOINC, general use, and gaming. We'll see what happens.

Thanks for the responses guys.

And linkin93, I know what you're saying. And trust me, LLC % options are still not in the latest release of BIOS for my motherboard. It's been discussed in past threads I think. Someone I think said ASUS is working on a fix for it for my mobo.
Edited by modinn - 8/1/11 at 7:59pm
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