There are no other cards in between, Just the two graphic cards in slot 1 & 3 as recommended by the manual for x8/x8 operation. I have tried switching the pcie-e slot to the top two slots which are PCI-E 3.0 x16, but the first card will always run at x4 while the second card runs at x16. Here is my 3dmark11 score which is pretty decent:
http://www.3dmark.com/3dm11/6791157. I just don't know why the first card will always run at x4 whenever a second card is installed.
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Here are My System Specs:
CPU: i7-3770k @ 4.6ghz
M/B: ASUS MAXIMUS V EXTREME Z77 (Bios 1802)
MEM: 32GB CORSAIR VENGEANCE
GPU: 2X GTX780 GIGABYTE OC WINFORCE 3X
SSD: 2 X OCZ VECTOR 256GB
PSU: SEASONIC-X 1250W
CPU COOLING: CUSTOM WATER LOOP
MONITOR: DELL 24"