I have a mother board Asus brand product MSQ-P8H67-MPRO(B) Planning upgrading it to GTX 700 Series 4G GDDR5 I've been told about loosing some performance because of the pci 2.0 that my motherboard has and the g cards are pci 3.0 so will I have any problems? Also I'm getting a 650 watt power supply with all the connectors I need and I got 8G memory I7 2600 chip no k. maybe extra fan for cooling. Thanks for any info