I9900k Overclock to 5ghz temps keep rising + fails Prime 95 tests

Daniel Fawcett

Daniel Fawcett

Daniel Fawcett

Associate
Joined
17 Feb 2019
Posts
3
Hi All

I have a front mounted H115i Plat with push setup with two exhaust fans.

The case is an omega RGB.

My idle temps are 31.4 C on the pump and the cpu sits at 39C.

CPU is a 9900k overclocked to 5ghz.

When playing games my pump temp goes up to about 41C after a while but the cpu heat still sits at 50C.

I'm just wondering if this is a normal temp for the pump to get too.

I have a custom fan curve linked below.

https://i.imgur.com/u6DYB6A.png

Spec:

VCPU = 1.30v

Ram:
2x8GB Cors Veng LPX DDR4-3200

HD:
1TB SEAGATE ST1000DM010 HDD

SSD:
Samsung 970 EVO Polaris 250GB M.2 PCIe 3D NVMe

MB:

MSI MPG Z390 GamingProCarbonAC

GPU:
MSI RTX 2070 GAMING Z 8G

HWInfo:
https://i.imgur.com/cN6XRbv.png

Airflow:
https://i.imgur.com/EJLvF97.png

Radiator:
https://i.imgur.com/qCEYALT.png

Full build:
https://i.imgur.com/Nbtfz9T.png

I've ordered one more HD120mm fan to add an extra exhaust to the case.

I'm just wondering if i can get any advice on whether to move the front rad up
so it's not directly next to the Hard drives and the shrouds?

Or if it make more sense to top mount the radiator and have 1 exhaust fan plus the AIO exhausting and move the two 120mm fans as intake as?

The worry with top mounting this AIO on this case i don't actually think there is space when looking at the setup.

Has anyone had experience with top mounting a AIO in the case?

All help will be greatly appreciated, as this is my first build using a AIO cooler it's very confusing on how to get the airflow correct!!
 
I'm guessing the temperature reported by the pump is the water temperature. It's impossible for the water temperature to be higher than the CPU temperature - for heat to be carried away from the CPU, it must be warmer than its surrounding cold plate/fluid. Also, the CPU temperature is measured inside the silicon. There is a layer of thermal interface material (paste or solder etc, in this case solder) then the metal IHS sitting on top of the silicon CPU die. Then more thermal interface material (paste) then the cold plate. So again, the temperature will be higher at source than in the fluid, several layers of thermal exchange away.

If your CPU is capping out at 50° at 5GHz that's smashing.

The failures of Prime95 are probably a unstable overclock. Have you tried raising Vcore a little?
 
LuckyBenski said:
If your CPU is capping out at 50° at 5GHz that's smashing.
Click to expand...

that's when playing games on a stress test it goes to about 80-85 but then it does keep rising over time which worries me

LuckyBenski said:
The failures of Prime95 are probably a unstable overclock. Have you tried raising Vcore a little?
Click to expand...

As for increasing the Vcore, i'm sort of worried about doing this as the temps are currently quite high and from my understanding increasing the vcore increase the heat output?
 
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