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If you intend to run two 6990s, my understanding is that you'll need to run Linux.
Nope. Windows can do 4 GPUs, 2 in each of the 6990's. It would work fine.
Topic: ... - page 2. (Read 4428 times)
As previously said by another user, I would not buy 6990's. A better price per performance are 6950's that are unlocked to 6970's.
The following card can be unlocked:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127555&cm_re=6950-_-14-127-555-_-Product
You can unlock it by following these directions:
http://www.techpowerup.com/articles/overclocking/vidcard/159
These can do 400Mhash/s per card for $270. 6990 can do 800Mhash/s per card for $750+. As you can see, building multiple machines with 6950's is a much smarter option.
The following card can be unlocked:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127555&cm_re=6950-_-14-127-555-_-Product
You can unlock it by following these directions:
http://www.techpowerup.com/articles/overclocking/vidcard/159
These can do 400Mhash/s per card for $270. 6990 can do 800Mhash/s per card for $750+. As you can see, building multiple machines with 6950's is a much smarter option.
Q1. 750w will definitely be enough for 1 6990, and will definitely not be enough for 2. 
I would say 950 at least if you're running 2 6990's.
Q2. Nah, gigabyte brand will be fine, go for it
Side note: i would say don't go with 2 6990's, better purchases can be made for pretty much any use you have.
I would say 950 at least if you're running 2 6990's.Q2. Nah, gigabyte brand will be fine, go for it
Side note: i would say don't go with 2 6990's, better purchases can be made for pretty much any use you have.
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