1000Watt enough for 4 GPU? [3-280x+7950]

[Liquitrix]

Hey guys,

I am currently using 3 GPUs - all 280x - with a 1000 Watts PSU.

I recently purchased a 7950 Powercolor PCS+ .

Can I power all 4 cards with this PSU: BeQuiet! PowerZone 1000W 80+Bronze ?

I am mining Scrypt algos

all 280x are ASUS DirectCU II TOP

thanks

[Equate]

1200W would be appropriate since you will have some headroom , also undervolt the cards.

[sonysasankan]

1200W would be appropriate since you will have some headroom , also undervolt the cards.

The asus can be undervolted and is quite effecient and you are probably peaking with 3 280X on a 1000W. Also its holding because its a single rail PSU. It will shut down if you connect another 280/7950 in it.

[envy2010]

If you undervolt and downclock the cards to their most efficient (in terms of MH/s per watt) point, then you can easily run them all on a good 1000W PSU. The better question then is whether you will get enough of a hashrate bump to justify it... I can't answer that.

I would not personally do this because 280x's and 7950's like very different scrypt settings, and you are hobbling your rig if you ever want to go full blast.

[nostradamus]

Short answer: No.

Long Answer: Mayyybe, if you undervolt and/or are mining a less power hungry algo like X11.

Either way, you will probably want 1200W+. Even if you can run on a 1000W PSU, efficiency and lifespan will suffer from running at 100% capacity.