1280x1024 is going to play it,m but you'll be at a bit of a disadvantage -- you'll have a narrow field of vision withjits 5:4 aspect ratio, compared to the 16:9 ratio of 1600x900 and 1900x1080 screens, or the 16:10 of 1680x1050.
for $400, you might be better with a Phenom II X4 build, which are End-Of-Life, but am3+ boards will take piledriver late this year/early next year