so I bought a "Noctua NH-U9B" and it performes like

>>57760033
Try reapplying thermal paste and reseating it.

Most of the time that's the cause of bad temps with an aftermarket cooler.

This is typical of the 4770K. You need to delid 4770K or sell it and buy a 4790K. No heatsink or watercooling loop will suffice, it's temperature issues is due to a poor connection between the die itself and the IHS.

However, 100% stress test, do you ever reach this? Is that AVX instructions running on the prime test, too? Just don't surpass 85c at 100% load

>>57760270
already dun

>>57760407
was afraid of that, not sure about AVX thingy but isn't that just for if I test when overclocked?

>>57760558

All new versions of Prime95 past v28 or something ( I forget which version it is ) use AVX instructions in the benchmark, which is EXTREMELY unrealistic stress on Haswell processors adding +0.2v if not more just by using AVX. Just do a quick google of "haswell AVX prime95"

>>57760558
>>57760270
thermal paste needs time to settle, it doesnt do its best after being just applied.

also its possible the only real benefit over modern stock coolers is sound emissions

>>57760593
testing with v27.9 atm, at 69 c after a few min

>>57760033
You've muffed your thermal paste for sure

>>57760593
doesn't seem to go over 69 C now, thanks

>>57760901
don't think so I'll check once again tomorrow, going 2 bed

don't use prime95 for stress testing haswell, use aida64 or occt instead