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Safe 24/7 Voltage for 5870?

post #1 of 7
Thread Starter 
Anyways, like the title says, what's a safe 24/7 voltage for 5870? I've seen threads that say 1.35v is the absolute max basically and I've seen a few people say staying at about 1.2v is safe 24/7. Just looking for some clarification on this.
Right now I'm at 1.162v at 985MHz core and 1300MHz memory. It's stable for what I'm using it for (bitcoin lol, find the thread if ur curious, it keeps your GPU at 100% load similar to FAH).

Forgot to mention temperatures sorry. I'm running a constant 79C on GPU temps. VDDC's run at 74C to 78C. I'm at 50% fan speed ATM and can increase if needed.

I'm wondering what voltage I could run at for an extended period of time under such stress. Could I be higher, should I be lower, am I good where I am?
Edited by Dezixn - 4/28/11 at 11:08am
post #2 of 7
Heat's the limiting factor.
post #3 of 7
I ran mine at 1.325v at 1030 24/7 without any issues at all.
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by Crystal_Castles View Post
I ran mine at 1.325v at 1030 24/7 without any issues at all.
Did it take that much voltage to get it completely stable for games and such? Interesting, it seems this application doesn't require as high a degree as stability as games and such.

Also added temperature information, forgot to add it
post #5 of 7
I just set it to the max voltage that MSI afterburner allowed me to off the bat and started testing the OC from there. It wasn't too hard to get it dialed in, just time consuming to get the stress testing done.

If you're running 79c already you need to set yourself a better fan profile. I never saw over 72c on the stock cooler. I have my fan profile set so that every degree in temperature is a 1% fan speed increase. So at 50 degrees my fan is at 50%. It might get kinda noisy, but it's the most effective fan profile you can have.

Heat is the biggest enemy to a 5870, if you can keep your heat low, they overclock like montsers with low voltage. If you're heat is kinda hight, expect it to take a lot of voltage to get it stable.
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post #6 of 7
I had mine at 1020 @ 1300mV 24/7 with a universal GPU water block with temps never reaching over 49C. Lasted over a year with no issues until I put it in my gf's brother's wedding gift build. I just put a mild overclock for him with the original heatsink and fan: 940 Core Clock at 1197mV with max temp at 75C.
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post #7 of 7
Thread Starter 
Quote:
Originally Posted by Crystal_Castles View Post
I just set it to the max voltage that MSI afterburner allowed me to off the bat and started testing the OC from there. It wasn't too hard to get it dialed in, just time consuming to get the stress testing done.

If you're running 79c already you need to set yourself a better fan profile. I never saw over 72c on the stock cooler. I have my fan profile set so that every degree in temperature is a 1% fan speed increase. So at 50 degrees my fan is at 50%. It might get kinda noisy, but it's the most effective fan profile you can have.

Heat is the biggest enemy to a 5870, if you can keep your heat low, they overclock like montsers with low voltage. If you're heat is kinda hight, expect it to take a lot of voltage to get it stable.
Hmm, hadn't heard this before... I'd be interested in some reviews that analyzed this if there are any. I'll go look for some myself later.
I'll have to work on optimizing my airflow in my case too. Since the temperature is constant in this situation I think it's best to have a static fan profile, but I could definitely up the fan speed some and see what happens.
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