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How to set up two graphics cards

Hi Tom,

I have two ATI HD3870 video cards, both have 512 of ram, and my system originally can with Vista. As soon as Win 7 came out I installed Win 7 and got the latest and recommended video drivers for my graphic cards.

When I run a diagnostic on the cards it tells me that One of the cards is a master card and the othe is a slave. I am supposed to be running at 1GB GPU speed, however when I run more benchmarking tests, It tells me that I only have 512 ram installed?

I recently found this out the hard way when I tried to run Battlefield 3, Can you please tell me how I can get these cards to run together.

Thanks for your help in advance!

Regards

John
4 answers Last reply Best Answer
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  1. Best answer
    When you have two cards in CF (or SLI), the RAM doesn't not get added together like that. You are only supposed to have 512mb of effective ram.
  2. ^yep. Xfire and SLI use both sets of RAM, but it comes out to the same amount.
    http://www.youtube.com/watch?v=BlXlczDEAXs
  3. Best answer selected by WarCannibal.
  4. Thanks Guys , is there any way to get the cards to run at 1GB GPU speed? and if it possible, will I get better performance? Thanks in advance!
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