GPU memory speed

[A1BITCOINPOOL]

I turn mine down all the way to 300 on my 5830's.

[1713956710]

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[1713956710]

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[1713956710]

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[mad_miner]

I got down to 150Mhz on my 5970s. But it seems to cost a bit of performance, so I tuned them back to 300 Mhz. Not much difference in power consumption anyway

[Chewyy]

7970 is core 925/ mem 700 / volt1068

[Tehfiend]

Does anybody know the best mem speed for 6870's? My 5830's get 330mhash @ 1000/300 but my 6780's crash any time I play with lower memory speed.

[induktor]

Hello
I tried to lower at 300mhz and the selected card turned itself off    (holy crap!, I almost shit myself thinking that i had fried the card) the other card was still runing, powercycle and everything go back to normal.

If I lower to 500 mhz, it still works, same performance, but i start to se some crap on the screen from time to time (artifacts).

runing memory at 600mhz is stable.

I have two HD 7850 Sapphire 1GDDR5, with the GPU at 700Mhz (default is 860Mhz) I get 205Mh/s per card, it's kinda slow but I'm concern on frying the card if I push it at max speed for long periods of time, what do you think?

Default voltage is 1138, I lowered to 1130 but not sure what is convenient, I am more concerned to keep the board safe than to get more performance out of it.
Temperature is 59 C (with 27 C ambient) in both cards. (fans are in automatic at 50% PWM)