Cooling issue with new build

AlexTrickle · 30 Aug 2017 at 08:10

So it seems I have been having issue after issue with my new build!

After getting past initial roadblocks and getting to a complete working win10 installation I moved onto looking at performance.

My i7 7700k is hitting 70-72 degrees at stock when running prime 95 cpu load test.

It has a Corsair H100i GTX on it which surely even at 100% load at stock should keep it cooler?

Points to do with the issue:

The mounting is definitely done correctly and tightly.

At idle the CPU is at 28-30degrees.

The system wouldnt boot with the h100i plugged into my CPU FAN header so I plugged a case fan to this header. The H100i GTX is plugged into the AIO PUMP header on my mobo.

In BIOS the RPM reading for AIO PUMP is 800rpm - not sure if thats the pump or the fans RPM.

The radiator is fitted to the front of my case with the fans as an intake (due to the mounting though they are inside of the radiator i.e. pulling air through the radiator rather than pushing it through).

I know I have a decent chip as I bought it from a reputable guy on the MM who had it hit 5.1 on air cooling.

Any advice is definitely welcome.

Full specs related to the issue

I7 7700K
Asus Maximus IX Formula
16GB TForce Nighthawk RGB 3200
Corsair H100i GTX
bequiet! Dark Base Pro 900

lude1962 · 30 Aug 2017 at 09:26

the fans are designed for pushing not pulling
some have said prime isnt the best test to use (avx instructions?).
try realbench stress test

mattyfez · 30 Aug 2017 at 09:44

72c is not a bad temperature for a cpu torture test tbh. 30c idle is perfectly fine too.

AlexTrickle · 30 Aug 2017 at 12:44

lude1962 said:
the fans are designed for pushing not pulling
some have said prime isnt the best test to use (avx instructions?).
try realbench stress test

Hmm okay, has this changed? My last build was an i5 2500k back in 2011 and back then everyone used Prime95!

I'll try reversing the fans just means I'll have to change the top/rear fans to be intakes and the two radiator fans being exit fans at the front.

AlexTrickle · 30 Aug 2017 at 12:44

mattyfez said:
72c is not a bad temperature for a cpu torture test tbh. 30c idle is perfectly fine too.

Aye I wasn't worried about the idle temps, just thought 70degrees seemed very high for stock! But did I read somewhere that Kaby Lake CPUs run hotter anyway?

mistersprinkles · 30 Aug 2017 at 13:38

AlexTrickle said:
Hmm okay, has this changed? My last build was an i5 2500k back in 2011 and back then everyone used Prime95!

I'll try reversing the fans just means I'll have to change the top/rear fans to be intakes and the two radiator fans being exit fans at the front.

No dude. He was saying to run your rad in push not your case fans. In the front out the back with case fans always.

What is your vcore on your CPU right now? check it with CPU-Z.
What are you using to read temps in windows?

Odds are your board is feeding that chip more voltage than it needs to run @ stock. Most boards do. Could be resulting in higher temps.