i'm using a dell 980 small form factor with 280-230 watt PSU pared with a core i5 650 . I wanna use a MSI Computer Video Card GT 710 1GD3H LP ( Fanless) or a MSI ATI Radeon HD6450 1GB low profile card with a fan ? would i be able to use these cards ? if i add a card and it wont work coudl i find a 300 powersupply? and if so will the new PSU be to much power and cause my pc to fry?