in overclock msi is similar to abit.
abit use 4ns hynix DDR
msi use 3.6ns samsung DDR
but the hynix DDR overclocks very well, so there isn't any difference between te 2 boards.
the gpu cooler of abit is the same gpu cooler of the ti4600 and is a bit better than msi
i have tryed 2 abit ti4200
the first was an A2 core, anc can do 325/650
the second is (i use it now) an A3 core, and clock sto 335/660
this with stock cooling, with watercooling and 3° water all two card can do 355 of gpu.. probably when i'd tested the first card the ambiente temp was much highter (but i don't remember) or the heatsink doesn't fit as good as the second..