Thanks, good to know.  I was going to order 2 more non-PWM Delta 120mm fans, but am going to spring the extra $$ for the PWM versions.

The delta fan blew out???  I thought they lasted forever.  I run the delta at around 80%, I'd rather replace the case fan, then replace the gpu fans.

If they are anything like the 7970, the top card will suck in the exhaust air from the bottom card heating up the top card.  Make sure your cooling can handle it.

get a reference design 7950 which has the blower fan that pushes the hot air out of the case and not all around the inside of the case which is what the gigabyte does.

I am a noob so I am unable to post in reply to people's problems with this gawd awful card.

I was mining successfully with one of these cards...then I had the great greedy idea that 2 is better than one.

Got a second card, plugged it in, set it up, started hashing and went to sleep...apparently I blew out the card, and the temps were around 90 all night long.  This cooling set-up is horrible when using 2 cards with out risers in a standard case.  The exhaust air from the bottom card get's sucked in by the top card, super heating the top card.

I got a replacement card, since I'm still greedy for my coins...I put a box fan right on the case and was able to run 75,80 on both cards...700+kh/s on each card...it worked but was not an elegant solution.  After 2 weeks of trying different fans and different settings to reduce the heat, I found a solution.

http://www.newegg.com/Product/Product.aspx?Item=N82E16835213006
I got the pwm version of this fan...now both cards run at about 72-73 all day long.  It's hella noisy, but that's the sound of money being made.

One thing I learned about fans...it's not about the rpm of cfm...it's about the pressure...the delta fans will push air even through high resistance.

Howdy

Change the driver to recommended catalyst version

As long as there is some profit to be made I will mine...to cover my hardware costs.