Hello guys, so i'm planning to buy a new gpu for my rig (a8-5600k, 4gb 1366, 450w). Found a few ones for my money: HD7790, r9 270, r9 270x. My Resolution is 1360x768, So, basically will 7790 be enough for gaming (its the cheapest one) or should i go for r9 270 or 270x (costs just a few bucks more). And another thing is i definitely need a new PSU for r9 270, but will my PSU handle the 7790? Thanks