I've got a few alternate panels I've got made for various graphics cards...an acoustic foam-padded one for the low-powered cards, a windowed one with a 120mm fan modded in, and a non-windowed one with a 220mm one added in. I'd really recommend making a 220mm one for a GX2 as my pair of 3870X2s were cooking the motherboard and I've read that the GX2s are similar if not worse for this. The 220mm fan is pretty quiet and moves a lot of air...but you've essentially got a big hole in the side of the case, so it may seem noisier than the noise the fan alone adds.