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how much voltage is too much?

lavaheadache

Diamond Member
Jan 28, 2005
6,893
14
81
My lightning 7970 looooves voltage. I'm just not sure where to stop. My asic score is rather low(60%), if that means anything. Anyhow, I've never really needed to overclock it too much but I'm just bored and tinkering.

My default core voltage is 1.175. It takes 1.275v to be 100% stable @1200mhz. I've played BF3 for a couple hours without issue. On the stock fan profile, fan speed hardly gets over 55% or so and is quiet while temps never get above about 67c.

I have briefly run the card at 1300mhz and beyond With the voltage maxed (1.35) just to see if it could even run at those speeds, which it did. Provided my temps stay low like under 80c, what voltage do you guys think is safe for some testing? I really don't plan on running the card maxed out like that but at the same time I wanna know what she's capable of.

My original reference card was better in the regard that it could run 1250 mhz @ 1.25v but the fan noise and temps were louder and hotter than this card at higher voltage by a long shot. Im quite impressed with the quality of the cooler on the Lighting.
 

BD231

Lifer
Feb 26, 2001
10,568
136
106
My lightning 7970 looooves voltage. I'm just not sure where to stop. My asic score is rather low(60%), if that means anything. Anyhow, I've never really needed to overclock it too much but I'm just bored and tinkering.

My default core voltage is 1.175. It takes 1.275v to be 100% stable @1200mhz. I've played BF3 for a couple hours without issue. On the stock fan profile, fan speed hardly gets over 55% or so and is quiet while temps never get above about 67c.

I have briefly run the card at 1300mhz and beyond With the voltage maxed (1.35) just to see if it could even run at those speeds, which it did. Provided my temps stay low like under 80c, what voltage do you guys think is safe for some testing? I really don't plan on running the card maxed out like that but at the same time I wanna know what she's capable of.

My original reference card was better in the regard that it could run 1250 mhz @ 1.25v but the fan noise and temps were louder and hotter than this card at higher voltage by a long shot. Im quite impressed with the quality of the cooler on the Lighting.
Obviously 1.35v isnt worth 100mhz. Gpu's are tough though, just make sure your vrm isnt scorching and 1.275v wont hurt.
 

3DVagabond

Lifer
Aug 10, 2009
11,951
200
106
Well, the stock 7950B is spec'd at 1.25v. I would guess that for a card with specs like the lightning 1.3v wouldn't be a problem at all. Your 1.275v/1200MHz sounds like a reasonable 24/7 setup.
 

SlowSpyder

Lifer
Jan 12, 2005
17,305
998
126
That card has a good power system and decent cooler. I would probably feel pretty good running it at 1.275 - 1200MHz. I think I would keep it under 1.3 volts. I don't have anything scientific to base that on, just where software allows the reference to top out at, that probably has some margin of safety yet.
 

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