I Need Urgent Help for HP Pavilion Elite m9000

[exdesi]

HP Pavilion Elite m9000 i want to upgrade the pc with graffic card GeForce GT 640 GDDR5 & power supply to play games
i want to know will this help to increase the pc performance & will this graffic card GeForce GT 640 GDDR5 work in my pc...

Here Is The Full Specifications for HP Pavilion Elite m9000:
http://h10010.www1.hp.com/wwpc/ca/en/ho/WF06a/12132708-12133156-12133158-12133158-12133158-80631744.html?dnr=1


Thanks.