I had ordered cm hyper 212 and the antec a400 for phenom x4 955, mobo: M4A88TD-M/USB3.
Both are not fitting.
Amd provides the clip on feature of cpu cooler but i find that both the cpu coolers clips are shorter in size !!
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faced clip issue with fitting stock amd cooler and I'm not a fan of that. Can't comment on Antec A400 but CM Hyper 212 should be easier to install as it's mounts with bolts and nuts instead of clips on AMD platform as far as I know.