they looked to be damn near the same...i gotta take a closer look. because all this time...i haven't even been paying attention to the 500 series...at all!...lol
hummm, it looks to be different...hummmm...but not by much. looks like the the row of 4 ram chips is a tad bit closer to the row of 5 ram chips. and the 480 has 3 caps right there. the 580 doesn't. and the 480 has a row of 6 caps along the ram..the 580 doesn't....