7970 undervolt by what amount to start with

[pgbit]

Just wondering, whats a sensible figure to undervolt by initially? I have read that you can undervolt more over time. Just wondering what a sensible and safe figure to aim at with a new setup. I have a Powercolor Radeon 7970 card, also a Gigabyte one. If anyone has stable settings, please post them with clock speed, mem clock, MH/s. Thanks!

[eraserhead]

2 x Sapphire Radeon
1100/350/1175  620 Mh/s
1150/350/1100  640 Mh/s

Temps around 75C

[pgbit]

thats really helpful, thanks, is that at around 1.17 volts or a bit lower?

[fflewddur]

I run mine at 1030 mV (according to Trixx... GPU-Z says they're actually running around 0.95 V), 975 core, and 825 mem. That keeps the temps around 77 C in a non-air-conditioned room, and gives about 580 Mh/s per card.

Eraserhead, how are you running the memory at 350? All of the AMD drivers I've tried force me to keep it 150 Mhz less than the core clock--any less and GPU-Z says the memory goes back to running at stock speeds.

[angelkarajov]

2 x Sapphire Radeon
1100/350/1175  620 Mh/s
1150/350/1100  640 Mh/s

Temps around 75C

Version of TRIXX? Thanks

[zackclark70]

set it so its arount 1v underload same on 7950s and 7970s

[coolamasta]

I'm running my 7950's at 1100mhz core, will check voltage later and let you know.

What im not sure about is if a memory speed increase would help with the mining or not, does anyone know?

[angelkarajov]

I can't change voltage with TRIXX(4.6.0 or 4.3.0). My card is Sapphire 7970.

[TheBitcoinMiningOutlet]

705 Mh/s-Stable- with-7970 over-clocked to GPU to 1150mhz- Memory 1250mhz. Stock Voltage-

IMO dont bother messing with the volts, to much risk of frying a card and 7970s arent cheap, i would know since i have 9x 7970 lol

 

[zackclark70]

undervolting should not mess up the card over volting will

[coolamasta]

Does memory speeds effect your output does anyone know or just best to leave them stock?

[zackclark70]

I have found that in depends on the program you are using I use reaper and uping the memory clock by 200mhz makes no different