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max voltage for a w /c 5970?

post #1 of 16
Thread Starter 
I have a saphire 5970 w/c in trifire with an asus 5870 which is also water cooled. The room the pc is in is pretty cold so temps never go above 40c.
I would like to reach 1000 / 1200 on the 5970 without bricking it, so far I've reached 970 / 1150 @ 1.225v and I'm a little worried about increasing the voltage further. What's the max before immenent death of the card?
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post #2 of 16
Thats a nice rig you got there. Now, if the card doesn't overheat then there is no reason why the card should die. Sure you are decreasing the life of the card, but when it dies (hardware last very long time) you will already have another card to play with.
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post #3 of 16
watch the temps but you should be able to pump 1.35v into it. what are you using to OC? If you are using afterburner it will not let you go past 1.35v and that will be "fine", depending on heat.

You shouldn't need 1.35v to get to 1000/1200 and remember the Vram doesn't matter what the Vcore voltage is, so you should be able to get the Vram closer to 1300, maybe 1260? that was my sweet spot. Pushing over 1000 on the core though you might need a little more Vcore I run my cards @ 1.3v and with water cooling I have never seen them over 60c, gaming they never go over 45c

You air cooling? stock coolers? if so once you get over the 1.25v-1.275v mark you will start seeing a jump in temps, no more 40c
post #4 of 16
Take bit of advice and keep your eyes on you VDDC/I temps in gpuz,its not the core temps you will need to worry about in this situation.

Also i know that MSI afterburner will allow 1.35v but i would not use that high,i doubt you would ever need to go that high anyway to hit 1Ghz core.

Does a 5970 have just one lot of VRMs? as opposed to 5870's each having their own voltage control gear onborad? worth bearing this in mind.

VDDC(vrm) temps...remember to keep eye on them
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post #5 of 16
Thread Starter 
Quote:
Originally Posted by superj1977 View Post
Take bit of advice and keep your eyes on you VDDC/I temps in gpuz,its not the core temps you will need to worry about in this situation.

Also i know that MSI afterburner will allow 1.35v but i would not use that high,i doubt you would ever need to go that high anyway to hit 1Ghz core.

Does a 5970 have just one lot of VRMs? as opposed to 5870's each having their own voltage control gear onborad? worth bearing this in mind.

VDDC(vrm) temps...remember to keep eye on them
Thanks, I really dont want to toast this card. I am trying to break 35000 in vantage, it's been a wall I haven't been able to get over. It also seems like sometimes when I increase the oc my score suffers until I increase it more. Dont really know why that is, could just be random fluctuations I guess.
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post #6 of 16
Thread Starter 
You air cooling? stock coolers? if so once you get over the 1.25v-1.275v mark you will start seeing a jump in temps, no more 40c[/QUOTE]

I am using koolance blocks 1 pa120.3 and 1 pa120.2 with 5 150cfm fans. Yesterday the ambient temps were below 40f in my room so heat really wasn't a problem. The 5870 ran hotter than the 5970 at about 38-40c
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post #7 of 16
oh ya I see in the sig line now " koolance w/c" :doh

So ya you should have no problem, 40c is COLD and these cards can get way over that. before I water cooled my cards I saw temps up to 85-90 on air while only hitting 900/1200, that is why I water cooled my cards.
post #8 of 16
Thread Starter 
[QUOTE=nickbaldwin86;12247856]oh ya I see in the sig line now " koolance w/c"

No prob. I do that too, so anxious to help I forget to read the sig lol
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post #9 of 16
The 5970 VDDC are terrible and can easily ruin the card if you are not careful.

The should never go above 120c. That being said they only become a problem when using synthetic stress tests like Furmark and as such if you use benchmarks instead of furmark to stress test they won't be a problem.
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post #10 of 16
Use furmark very sparingly. and watch more than just your core temps.

I use it just to clock my card/s, then I turn it off, I have not used it once since I found my max stable clocks. There really isn't any reason to run it otherwise, and like I saying before no other benchmark/program even comes close to getting my cards as hot, even folding.
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