Can enyone explain does the 7970 or today high end graphics card uses full potentional on PCIe 2.0??From past couple of days i buy asus sabertooth p67 with (PCIe 2.0) and i5 2500k.and i wondering is this bad investment??,because this motherboard dosent have PCIe 3.0???? I planing to buy 7970.Will 7970 on p67 use full potential?Or is PCIe 3.0 marketing trick like sata 6.0??