I'm upgrading my current computer (http://www.gateway.com/systems/prod...www.gateway.com/systems/product/529668795.php) so i can play modern video games. I already have an upgraded video card, but my current PSU is only 220w. I want to buy a 450+w PSU but when i opend my case it doesnt seem like it is going to fit. Is there case extensions or someway i can fit this Powersupply? p.s. i searched up sff power supplies and the highest watt that i could find that would fit was 270 for about $175