Let me qoute you an article from overclock 3D's review:
Clearance between the GPU and the rear of the PSU is extremely tight. We mentioned earlier that it's best to have the fan facing outwards as to have the PSU rotated would mean the main 24 pin ATX supply would be directly in the path of the GPU. As it is the sockets on this modular PSU would impinge on the PCB of the GPU were it to extend much further. It's also worth considering that we're using a 160mm long PSU, as to use anything longer would drastically reduce the max GPU length from a very ample 320mm down to a paltry 230mm. As it is the ancillary power cables in the modular PSU would impinge on a GPU dropping the length down to 290mm or even 250mm should the lower rail be needed.
So depending on your PSU size between 230-320mm would fit.
Keep in mind that Asus's card is 287mm long and Gigabyte's one is 292mm, so unless you have a very short PSU the answer might be no I'm afraid