Hey right now I have a hp pavillion elitie m9510f pc and im looking to upgrade my video card to this, Newegg.ca - GIGABYTE Ultra Durable VGA Series GV-R685OC-1GD Radeon HD 6850 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity is it possible or do i have to upgrade other things like my power supply etc?