Secondly I will be needing a new power supply to run this and I'm not sure exactly what to choose, I've heard some people say a 550W PSU and others tell me a 600W. Lastly do Power Supplies vary in size? Or is it one size fits all?
Any help you could give would be greatly appreciated.
All current mid range to high end video cards (which includes the 5850) feature a double slot cooler on the reference cards itself.. The PCS+ from powercolor gives non reference cooling solution which is also a double slot cooling.. Thus, noapparent size difference..
Your motherboard link came a dead.. However, i gather from your provided data that it has onboard 8100 graphics.. THus it'll definitely have a pci-ex X 16 slot which is good for the card you've selected..
You can get the CORSAIR VX 550W.. It has enough juice to power that card.. Power supplies do vary in size depending on their wattage..
I fixed the link. Are you sure about the size? I seem to remember the PCS+ having some kind of pipe system on the side of it? Also would I be better off with a 600W rather than 550W, I'd like a PSU that could run everything quite easily and the impression you gave me with a 550W has left me quite nervous.