05-17-2013, 04:30 PM
It's hard to see from that picture but assuming it's the same as the manual (I'll use the letters from the diagram on p.11), the black slot you circled would be the PCI-E x16 (Secondary) © so you could move your graphics card to there and then you should be able to fit the DG in the PCI slot (white slot) (E) above it.
The very small black slot at the bottom is the PCI-E x1 (B) and the DGX would work in that, or the large black slot above it (PCI-E x16 (Secondary)) ©, or (F) which is currently obscured by the graphics card but wouldn't be if you moved that to ©, or the slot above where the graphics card currently is (H).
The very small black slot at the bottom is the PCI-E x1 (B) and the DGX would work in that, or the large black slot above it (PCI-E x16 (Secondary)) ©, or (F) which is currently obscured by the graphics card but wouldn't be if you moved that to ©, or the slot above where the graphics card currently is (H).