Overclocking 5850 voltage, temps 24/7 stability

[Nerusy]

Hello there

My 5850 can do 1ghz core clock at 1.312 stable and fan doesn't go above 35%

When I crank it up to 100% fan speed my card can somehow be stable at 1ghz at only 1.25v

So I take it the cooler these cards run the more stable they are? I know its sounds like basic logic but I thought unless temps go to 85C and higher the temerature shouldn't affect stability or how much voltage the card needs to do 1ghz.

Also what damages the cards, is it the voltage or heat that voltage increase brings?

A lot of people say 1.35v is too much for 24/7 overclock but if the temps don't go above 70C do you think 1.35v is ok for 24/7 overclock?

Thanks for helping me out

 

[snedie]

1.35v is high for a gpu, but yer heat is what does them in.

Your on the mark in that the cooler a card is, the more stable and easily achievable the overclock. It's mostly to do with the VRAM and VRM's, in that they remain cosistantly hot even when not under load.

I'm no physicist, but as Silicon chips heat up, they become more restrictive to current. This means that more voltage is required for them to run at faster speeds without loosing their conductivity. So, the cooler the better.

100% fan however is quite unpractical unless you have some seriously loud headphones. Don't forget to try tweaking both the GPU and MEM speeds, as when a system halts after alteration of one, it may be the other timing out.