After many years of dissatisfaction with my temperatures and overclocking performance I recently decided to re-position my Corsair H100i v2 AIO radiator/fans as front intake, moving the existing intake fan to a top exhaust.
I did not reseat the cooler, but just moving it had a dramatic impact giving me temps of low 20s idle and 60s under full load, but it seems to work well one day and then reverts to performing poorly on another day without me having changed anything / moved the PC. As I am in the UK I do not believe room temperatures are a factor.
I am currently using adaptive voltage of 1.28+, LLC level 5, everything else auto or unchanged. I have tried various combinations of BIOS, voltage, fan speed etc and often see temperatures of from 30 to 60 under slight load and going above 90 under load. I have tried lowering clock speeds to 40 in the past but the temperatures have still been excessive based on what I have seen is typical for such a configuration.
The cooler seems to be running according to Corsair link, there is no audible sounds beyond the fans, one pipe is often warm the other is cool.
Attached are pictures showing Corsair link with hot temperatures at boot, more settled temperatures 10 minutes after boot, and another showing low temperatures on a different day when it appeared to be operating well.
Specs:
Intel 6700k
Corsair H100i v2 AIO water cooler now configured as front intake
ASUS ROG Maximus Ranger VIII, bios 3703
Fractal R5 with original front and rear exhausts
Corsair RM 850x PSU
Gigabyte 2060 OC Pro
Corsair CMK16GX4M2B3000C15 Vengeance LPX 16GB (2x8GB) DDR4 3000MHz C15 XMP 2.0 High Performance Desktop Memory Kit (running at 2133Mhz)
Most components were bought in 2016, except the graphics card and RAM (1 year old).
Another problem I have is with XMP although I am happy to leave this disabled but would be keep to establish if the RAM is OK. Since I upgraded from 8gb to 16gb of the same Corsair 3000 LPX memory, this resulted in an immediate temperature increase and after restart/resume from sleep I get code 00 on the mobo and need to press the CMOS reset button to get it to POST at all. I also tried the motherboards MemOK button at this point which is supposed to tune the timings I believe, but this had no noticeable affect.