WTF are you talking about? P4 3.2E is just as fast as a P4 540 or whatever the S775 version of the 3.2E is. And NO card is fast enough to take advantage of AGP8x, let alone PCIe x16.
Since neither the CPU socket type nor the card interface is a limitting factor, we're still left with ALL CPU's being "too slow" and ALL graphics cards being "a limiting factor".