Minimum power supply requirement for graphics card?

Was looking at buying an HP desktop computer off their website, but the video card I want (ATI 4850) requires a 450 watt power supply, while the specs for the computer say it only has a 350 watt supply (e9250t model). Does the power supply have to be 450? Not sure why the hp website allows this conflicting... show more Was looking at buying an HP desktop computer off their website, but the video card I want (ATI 4850) requires a 450 watt power supply, while the specs for the computer say it only has a 350 watt supply (e9250t model). Does the power supply have to be 450? Not sure why the hp website allows this conflicting configuration?

Thanks.
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