2coolteks has no annodizing (just bare aluminum,thats why its silver)and a clip that exerts more force than the black original but they are the exact same size and the cooling potential is the same. The 2cooltek fop38 is technically approved while millisecs isn't but there is no performance difference. Think twice before buying this hsf, even hardcore overclockers will be bothered by the noise. And use a 3-4pin converter because the delta fan will kill standard mobo fan headers.