I was wondering if my HP Pavilion Slimline s5304y Desktop PC with a 220 watt power supply will be able to support a MSI R4550-MD1GH Radeon HD 4550 1GB 64-bit GDDR3 PCI Express 2.0 graphics card that asks for a min of 300 watt power supply, i had heard that some manufacturers write overcompensating power wattage requirements on the package and that the graphics card takes up much less power from the psu, i really would not like to blow out my power supply, so if you could please help me, that would be wonderful.