This cooler works great. Before installing overall cpu temp was 81 to 82 deg.C with individual core temps in the mid to upper 70's with a stock heat sink and fan and only 12 of 16 threads in use(my cpu is a Xeon e5 2670 with 8 cores,16 threads) after installation overall temp is 65 max with core temps 60 to 61 with 15 of 16 threads in use. So overall 15 or more deg. temp difference with more threads running is very good already bought a 2nd one for my next build a 12 core 24 thread ver. 3 2670 where I think that it will perform just as well.