hello, I have a dell optiplex 745 with a PCI-E 1.0A slot. I would like to drop in a radeon 5570 and have the ability to do some 1280x720 gaming on my big screen. my issue is however in the refrence manual it states that the max power draw for a video card can only be 25 watts, does this sound right? If this is the case, I may be forced down to a 5450. This machines intended use will be for HTPC movies, music, surfing and hopefully some light gaming.