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Corsair H100i High pump temps and loud fan. Fault?


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Hi everyone. I seem to be having a problem with my cooler for my CPU. It's a Corsair H100i GTX Hydro Series CPU Cooler. what seems to be happening is while gaming or just normal browsing my fans start to go 100% after about 10 minutes and stay at 100%. I've looked on Corsair link and from what i can tell the pump temperature quickly rises to around about 40c+ and the fans automatically kick in at full RPM and therefore begin making a very loud noise. The temperature of the pump doesn't seem to lower even though the fans are running at full RPM, if anything it slowly creeps up even more. My Temperature for my CPU hovers anywhere between 45c - 65c depending on gaming / browsing/ idling. I've tried different profiles on Corsair link (Balanced, Quiet, Performance) and they all have the same result, once the pump temperatures hit 40c the fans go full 100% speed. I've even created a custom fan curve which i've maxed out at 80% fan speed at 40c+ but it'll just creep up and get to about 48c or so.


I bought my pc last October from an online website in the UK (pcspecialist.co.uk) and i'm still under warranty for parts.


My question is, is this normal? Is this enough to warrant an RMA?


Here's my System:




Overclocked CPU

Overclocked Intel® Six Core i7-5820K (3.3GHz @ MAX 4.4GHz)



Memory (RAM)

16GB Kingston HyperX FURY DDR4 2666MHz (2 x 8GB)

Graphics Card

GeForce GTX 980 Ti Asus DirectCU III OC Strix Gaming 6GB Edition

1st Hard Disk

240GB Kingston V300 SSD, SATA 6 Gb (450MB/R, 450MB/W)

2nd Hard Disk

4TB WD BLACK WD4003FZEX, SATA 6 Gb/s, 64MB CACHE (7200rpm)

1st DVD/BLU-RAY Drive


Power Supply


Processor Cooling

Corsair H100i GTX Hydro Series High Performance CPU Cooler

Thermal Paste


Extra Case Fans

2x 120mm Apache Black Quiet Fan (fitted to extract from rear/roof)

Sound Card


Wireless/Wired Networking


USB Options


Power Cable

1 x 1 Metre UK Power Cable (Kettle Lead)

Operating System

Windows 10 64 bit


Any help and information would be greatly appreciated

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No, it isn't normal. The slow and continual building heat inside the cooler (water temperature or H100i GTX Temp) usually indicates there is a flow problem of some sort. If you can verify the pump is running and check the pump RPM in Corsair Link, then this is the most likely issue. Unfortunately, there is nothing you can do it about and you will need to RMA the cooler through Corsair or whatever options are available through the original vendor. There is a Corsair UK return center, so it shouldn't be too difficult to get a replacement.


The 980Ti puts out an enormous amount of heat and it will affect your water temperature while gaming or other GPU load, but this should not be an issue at the desktop level or while browsing. Water temperature is fairly slow to change up or down, so a steady rise when load is not present is usually a warning sign. If your water temperature climbs into the 40's after cold boot, there is some sort of restriction.

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I've just booted up and been on for about 10 minutes now doing a little browsing and idling. Corsair link shows my H100i pump temperature at 36.1c, Fan running at 1900rpm and the pump running at 2900rom (pump is on performance mode because if i put it in quiet mode the tempertaure shoots up dramatically in minutes). It'll gradually increase in temperature to around about 39-41c with my fans running at about 2000-2280rpm (roughly 70-80% fan speed). It's a warm summer day in England today so obviosly that'll factor into it as well.


This is purely just browsing and also idling.

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That is getting a warm for idle, but it is not clear cut as to whether there is a problem or a combination of enviromental and hardware settings.


I am going to guess your Vcore is the 1.25 to 1.29 range. That's fine. If you are running a fixed voltage without C-states, that may cost you a 2-3C. By comparison, my 5820k@4.4 and 1.285v will water temp idle at 28-30C in a 24-25C room. A water temp of 4-7C over the ambient room temperature is typical. So, I am a little concerned about reaching the upper 30's unless it is 30C in the room.


980Ti. Everytime I find a problem that doesn't make sense, this card pops up and resolves the issue. The thing is a heater, plain and simple and will affect your water temp under load. When testing, make sure you minimize any GPU load activity to remove it from the equation.


Is the H100i GTX in the roof blowing air up and out?


I am concerned changing the pump speed at idle makes a difference in your water temp. That should not make the slightest bit of difference without load and even with, it should be slight.


I don't want to give you a load test until I am sure as to what happening. In Link, set a fixed fan speed of 1000 and then leave it at idle for 10 minutes. Record the beginning and end temperatures. Also, please note your room temperature. The limited fan speed should make any deficiencies more apparant. You should be able to leave it at 1000 RPM indefinately without temperature increases.

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Yeah my Vcore is around about 1.274v. It's roughly about 8pm here and the ambiant room tempertaure is about 18-20c and currently my pump temperature is around about 38c with a fan speed of 1260RPM (that's the lowest i can get is as it doesn't let me go below 40% fan speed on CL4.


I did an online benchmark test on Silverbench (http://silver.urih.com/) and my Temperature went to 40c. After the test it's currently idling at 39c at again 1260RPM.


My H100i radiator is located at the roof of my case in a push configuration (Air blowing out the top).

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OK, I was hoping you would let it just sit idle since I can have a pretty good idea of the heat released in that state. The benchmark is an unknown for me. However, I am concerned by the 20C over ambient temperature even after the test. Even when I blast my system with something heavy, it will come back within 3-4C of the starting temperature almost immediately.


It comes down to this... when sitting at your desktop reading this, your water temp should not be on the rise, no matter the fan speed. If it tends to climb and stay at an elevated level, something is wrong. It's not a complete blockage or pump fail, otherwise the tests would impossible. Yet, something is not quite right. You don't have a tiny case, so it would be difficult for internal heat to be responsible at the idle state. I would start the RMA through Corsair or the original vendor, which ever is better terms for you.

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So i've had my PC turned on idling for about 40 minutes now and the temperature is at 41c for my pump at 1860RPM (60%) fan speed. Ambiant temperature is around about 20c. My GPU is at about 59c as well, no load.


I'm going to contact PCSpecialist and have it RMA'd via them as i have warranty with them. Thank you for your help and input. I'll let you know how it goes. :)

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So I contacted PCSpecialist and the're sending me out a replacement. A Corsair H100i V2. Hopefully this will be the last of it. I should point out my 980ti is at 60c temp becuase the ASUS strix has a default setting that the fans stay at 0RPM until over 60c. ( something about keeping it silent). i change it sometimes using MSI Afterburner. It doesn't even change the temperature of my pump even if my GPU fans are high.
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Yes, I recognized that was probably in the default zero fan mode and it is also present on my junior league 970's. I despise the mechanics of it and gets people who don't know about the tech into a spot of difficulty wondering why their cards run so hot and the fans scream at them the moment they start to game. You can take enormous amounts of heat of the GPU board simply by running a steady and barely noticeable 20% minimum fan speed, but that is a whole additional thread.


Hopefully, the replacement will solve the issue.

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