the one random guy :
bigcyco1 :
Out of these two coolers i would go for the 412slim. It performs a bit better than the 212 evo but is also larger so make sure that your case has enough room for it to fit.If you are going to overclock the cpu a lot then i would recommend getting a better cooler but that depends on your budget and availability in your area.
would it fit in the corsair 100r?
Why are you necroposting in a 2 year old thread to ask that?
Anyway, I doubt either the 212 evo or the 412 slim will fit in a 100r, as the case specs say it only has 150mm clearance for cpu coolers, and those two are 159mm and 160mm tall respectively. If it's available where you are, you could consider the Cryorig H7, which is 145mm tall. Also, if I'm not mistaken, it's newer than the prior post in this thread (as far as I can tell, it came out around January 2015).