depends on the pcie bus.
if its 16x/8x/4x or 8x/8x/4x then maybe no
He has a ud7, 3x6970 on x16x8x8 will still be faster than 6990+6970 on x16x16
Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.