I'm running 2 1440x900 monitors, I have a 620 watt power supply, an MSI 970a-g46 motherboard, an FX-8350 CPU, and an antec 300 case. Would this bring a great performance boost? Is it worth it? I currently have an HIS IceQ X 2gb 256-bit 7850 OC'd to 1ghz core clock and 1400mhz memory clock. Thanks!