Will graphics card work with power supply?

Looking at buying a Radeon HD 5750 1gb. One of the requirements is that it has a "450 Watt or greater power supply with one 75W 6-pin PCI Express® power connectors recommended". My current power supply is 300 watts so I need to upgrade. Unfortunately I don't know much about hardware so I was wondering if someone could let me know if this power supply I found would work for the Radeon HD 5750 1gb and the current motherboard I use. Power supply (looking to buy): http://www.tigerdirect.com/applicat... Motherboard (already own) - my graphics card is not the one stated in the link fyi: http://h10025.www1.hp.com/ewfrf/wc/... Specs for my computer: Phenom II x4 910 8 GB of Memory ATI Radeon HD4350 1 TB Hardrive 300W Power Supply Thanks to anyone who can help.

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