Crossfire 6870's

I've been thinking about possibly upgrading my mobo for dual 16x crossfire and sata 6GB capability. So out of curiosity I downloaded GPU-z the other day to see what my crossfire cards were running at. According to GPU-z my cards are running at 8x and 4x, not the dual 8x that my board is supposed to be capable of. Is there any reason for this? Can I change it or is GPU-z wrong?

My mobo is an Asus M2A78T-E and i'm using 2x Sapphire Vapor-X 6870's
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More about crossfire 6870
  1. Cant find that board but this one has three slots maybe it is a slot issue. http://www.asus.com/Motherboards/AMD_AM2Plus/M3A78T/#specifications
  2. i think u have an am2 or am2+ mobo.
  3. Check what your BIOS says about the slots. With your 6870's there is not going to be any noticeable boost from going to x16 x16 CF max 1-2%.
  4. if u cf hd 6870 then you will get about 80% more performance if u can sell that gpu then sell it and buy one high end sinle gpu for example gpus like hd 7950,7970.

    btw i think you will get about 80% more performance according to guru 3d.

    http://www.theitdepot.com/details-XFX+Core+Edition+550W+Power+Supply+(P1-550S-XXB9)_C14P10577.html

    goodluck.:)
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