Quad HD 7970 Bitcoin Miner - PSU Req.?

[Spendulus]

got another rig with 2 x 7950's just today and getting SICK on the second card. You have any luck resolving your SICK status? If so was it just changing miner?

how hot are they running? and how high is your Engine? I had to cool my my cards and lower the clocks to stop them going SICK and DEAD.

You mentioned that you were running cgminer on Ubuntu.  I'm running a similar setup with 2x7970.  I'm getting slightly lower hash rates, ~600MH/s per card.  Can you tell me what your command line looks like?  And what versions of the driver and OpenCL package you are using?

http://imgur.com/a/mRbMZ#y6zZ4pi   that's in Win7 tho. but pretty much the same card config. AMD 13.1 drivers.

QG

In spite of 5 fans in the sides of the Antec 900 case, 2 7970s ran like 97c and 89C.  I took off one side and laid the case on it's side, open side upwards.  Temps went down to 60-70s. 

I think it was simply because hot air rises.  Machine is very very happy now.

[alobi]

I use a Corsair AX1200 - works well for my 4x7970s.

[ThatDGuy]

In spite of 5 fans in the sides of the Antec 900 case, 2 7970s ran like 97c and 89C.  I took off one side and laid the case on it's side, open side upwards.  Temps went down to 60-70s. 

I think it was simply because hot air rises.  Machine is very very happy now.
[/quote]

This is a simple, great idea - definitely trying it later tonight!

[ITGeniusGuru]

it gets me 700GH/s on each card, sometimes it gets up to 750. 3.0GH/s BABY!! YEEHAA!!

I am in the process of building exactly same rig and 2.8 to 3.0 GH/s is what I expected from four 7970's
How many bitcoins are you making a week? a month?

[QuiveringGibbage]

At 2800 MH/s, you should earn 0.12587176 BTC/day ($14.80) on average (0.00524466 BTC/hr)

I get about 1 BTC every 10 days paid out to me. That won't last tho, as difficulty rises ~10-20% every fortnight.

And if your cards are voltage locked and you can't undervolt them like me, you be paying most of those BTC into electricity. Currently it cost me ~$12.00AUD a day to run this machine. So I'm only really making $2 a day.

You should really be considering ASIC devices. While not as fun, they are more power efficient.

QG