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Drewstre
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Swapped Corsair H115i for Noctua NH-D15 (i7-6700k)

Thu Sep 20, 2018 1:26 am

Quick(ish) post... So a coupla years ago, I splashed for the Corsair H115i liquid cooler when I got my new rig:

CPU: i7-6700k
Mobo: Gigabyte Z170X-Gaming 7
Case: Fractal Define R5
RAM: G.SKILL Ripjaws V 16GB DDR4 3000

From the get go, I was unhappy with the cooling of the H115i, as alluded to in an earlier thread:

https://techreport.com/forums/viewtopic.php?f=4&t=118357&p=1319048#p1318814

It was like the liquid cooling loop just didn't react quickly enough to temperature changes.

I originally bought this gear with the intention of overclocking the i7. I started with 4.4 GHz, but that was too hot. Backed down to 4.2 GHz. Still much warmer than I thought my (then) high-end kit was capable of. It was hitting 80°c during a background virus scan. I scoured the interwebs for more effective cooling curve info to experiment with in Corsair Link. Nothing I tried worked, short of cranking the fans to top spin, which was VERY loud. The pump was set on the high setting in Corsair Link. I was very, very close to going the delidding route. After a few frustrating and fruitless attempts at re-applying the thermal paste, I decided to try the Noctua NH-D15. Glad I did.

Unfortunately, I didn't do any extensive testing before the swap, but here are a few numbers... all the same settings before and after the swap. The i7-6700k is at 4.2 GHz, the RAM at XMP 1 (DDR4 3000). (All temps Celsius):

Idle temp, H115i: 43°
Idle temp, NH-D15: 31°

Gaming-Overload temp, H115i: max 83°
Gaming-Overload temp, NH-D15: max 55°

Gaming-Doom16 temp, H115i: max 81°
Gaming-Doom16 temp, NH-D15: max 60°

Those gaming numbers are for the games Overload and DOOM (2016), my two latest indulgences. Not quite an extensive benchmarking suite, but indicative, nonetheless.

I oriented the Noctua for rear exhaust, and replaced all the top plates on the Fractal case upon installation of the Noctua (since the H115i rad was top-mounted). My system is much quieter and and much cooler. Probably gonna try to get back up to 4.4 GHz, see what happens.

(By the way, if you were a fan of the old Descent games, you, _really_ oughta check out Overload.)

I definitely respect Corsair and their products (my RM750i PSU is perfect), but I thought I should share.

Anybody wanna buy a gently used H115i? :^)
 
SkyWarrior
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Re: Swapped Corsair H115i for Noctua NH-D15 (i7-6700k)

Thu Sep 20, 2018 1:42 am

Good riddance. I did a similar thing for 7900X and I am speechless.
RMA that H115i and get a H115i pro and sell it to profit. H115i's are defective.
Rare is common where I work...
 
End User
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Re: Swapped Corsair H115i for Noctua NH-D15 (i7-6700k)

Thu Sep 20, 2018 6:10 am

Quick check and my 1950X is idling at 35° C using a H115i.

Gaming-Doom16 temp, H115i: max 44° C in quiet mode. 42° C in performance mode.
 
Voldenuit
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Re: Swapped Corsair H115i for Noctua NH-D15 (i7-6700k)

Thu Nov 08, 2018 11:23 am

Interesting results, that H115i performance does look terrible. Were you running a flat 12V to it? I've heard the Corsair 'i' series coolers don't like being PWM or voltage regulated, and prefer being fed a constant 12V from the motherboard header.

I'm using a H100i v2 (240mm rad). Running a custom fan curve that's equivalent to the 'Quiet' setting.

CPU: i7 8700K, delidded and repasted w Liquid Ultra
Clock settings: 4.6 GHz all core boost, 'Normal' voltage w +0.040 V offset
Motherboard: Gigabyte Z370 Gaming 3
RAM: 2x16 GB G-Skill 3200 MHz 16-18-18-38 T2 (running at T1)
Case: Phanteks Enthoo Evolv ATX (2x 140mm intake, 1x 140mm rear exhaust, 2x 120 mm H100i fans exhaust)
CPU Cooler: Corsair H100i v2, modified 'Quiet' Profile, Pump @ 1900 rpm, Fans 1000-1500 rpm (pump-controlled)

Idle: 20-25 C
Load Prime95 small FFTs: 67 C
Load Gaming: ~50-60 C, typ. closer to 50 C
Wind, Sand and Stars.
 
ptsant
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Re: Swapped Corsair H115i for Noctua NH-D15 (i7-6700k)

Fri Nov 09, 2018 6:55 am

Voldenuit wrote:
Interesting results, that H115i performance does look terrible. Were you running a flat 12V to it? I've heard the Corsair 'i' series coolers don't like being PWM or voltage regulated, and prefer being fed a constant 12V from the motherboard header.


The pump should not be voltage regulated. High-end ASUS motherboards have a separate AiO header on the motherboard that is not subject to any kind of regulation.

I suspect the pump was not working properly. The 115i is a high end cooler that should at least be comparable to (if not beat) any air cooler.
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