Hello i have a question....i have an old i7-930 @ 2.8ghz cpu i didnt over clock it my board has the pci -express 3.0 so how high can i go on graphics cards without bottle necks? i would like to put a gtx 900 ish card in there or at least a card with 4gb but dont want to do so if it would bottle neck the system....any tips/hints would be appreciated thanks!