In the beginning of this very topic there are performance calculations and at several posts within. SSAA works by rendering bigger image and then averaging pixels while distributing the error. Guess what downsampling does. The performance hit of SSAA and downsampling of equal resolution were found to be about equal and both being considerable. A 24" 4k monitor is worth constant 2xSSAA, I totally vote for going into that direction, because of scrypt mining pretty much everyone I know has abundance of ati cards, can play any game at any resolutionI still don't know what hardware does the downsampling tho - with nvidia is clear - the card, with ati is not so - it looks to be the monitor itself, but then the quality of the downsampled picture will depend on monitor's firmware/hardware, can be great or horrible.