Hi guys and gals, I have 2 Evga gtx 670s. My set up is in a fractal design define mini and uses an Asus Gryphon z87 motherboard. In the define I would have to run the two cards tight up against each other (due to only 4 slots in the case). I only run one card currently because I am worried about temps, even though both cards vent externally. What I want to do is get a corsair 350D matx case which has 5 slots in the back of the case. I could then run the second card in the bottom pci slot so there would be a gap between the two cards. The problem is that the bottom pci slot is only PCI2 16X (as opposed to pci3 16X of the top two slots). Would this be detrimental to performance? Thank you in advance.