7700k with H100i Idle Temps at 40C, Load Temps at 80-90C

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OminousD

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I just recently upgraded my RAM and CPU from 2133 16GB DDR4 and 6700 Non-K to 2666 32GB and 7700k. Everything is able to boot and load (typing from here as we speak), but I'm very worried about the temps. For context here is the current build.

CPU: Intel Core i7-7700K 4.2GHz Quad-Core Processor
CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler
Motherboard: Gigabyte GA-Z170N-Gaming 5 Mini ITX LGA1151 Motherboard
Memory: Corsair Vengeance LPX 32GB (2 x 16GB) DDR4-2666 Memory
Storage: Mushkin Reactor 1TB 2.5" Solid State Drive
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive
Video Card: Gigabyte GeForce GTX 1070 8GB Mini ITX OC Video Card
Case: Corsair 250D Mini ITX Tower Case
Power Supply: EVGA SuperNOVA NEX 650W 80+ Gold Certified Fully-Modular ATX Power Supply

Prior to the upgrade my CPU temps ranged from around 20- 30 idle and around 56 under maximum load. My radiator fans are setup as an exhaust while the system fan serves as an intake fan. I just reapplied thermal paste to the CPU ant the temps at load are around 85 - 90. I'm wondering if it is an issue with the thermal paste or the way that the fans are currently setup. As far as overclocking the only thing I've enabled was XMP profile 1 for the RAM. Outside of that I haven't touched any CPU speeds. Any help would be greatly appreciated.
 
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JCarax
There are a couple of things that cause the CPU to overheat with 7700K.

In my case I had my memory at 3000(X.M.P) and CPU at 4.8ghz(bios OC preset) and I was getting 36-40 Idle temps and 80+ on battlefield 1. My ambient around 20-25.

I disabled X.M.P, set the speed to 2666(with tigther timings) and removed the O.C profile. Enable turbo boost but disabled Cstate and speed step(so my cores at 4500 constantly).

Now the idle temp is around 29-34, CPU Z benchmark temp at 64 and battlefield 1(intesive 64 man maps) doesn't go above 70.

I tested this with lower ram speed and the CPU was even cooler.

Intel says any ram speed above 2400 will cause the CPU to run hotter and become less stable.

Haven't ran into any problems regarding...
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OminousD

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So far I tried the Prime 95 and CPUZ stress test and I was hitting 90 - 100 C at full load, still on stock speeds. Currently the pump fluctuates between 2056 - 2064 RPM on Corsair Link even when changing the mode form quiet to performance so maybe there may have been issues installing the pump. In the actual Corsair Link application it doesn't give me any configuration options on the pumps but I have control over all of the other fans so that may be a factor. I've installed the cooler twice so far replacing the original pre-applied paste with a new application and the temps are still the same. I'll try to see if changing the fans on the radiator to intake fans make a difference
 
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junkeymonkey

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''Pump is always the same speed no matter what''

maybe as long as you did not get the lemon

if not running at a too low RPM and not circulating the liquid proper it cant cool as efficiently . you can se a lot on these h100's at corsairs forum as well lot of temp issues

good luck
 
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OminousD

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UPDATE: I was able to fix the CPU temps by reapplying the thermal paste (twice) and disabling the XMP profile. While this fixed the temperatures, the GPU utilization severely dropped to under 56% utilization. I only tested this on Witcher 3 so far, but with XMP disabled the CPU was hovering around the 40's on silent mode with around 70% usage at stock 4.2 GHz with the RAM at stock speed of 2133, but the GPU with it's stock overclock had usage under 50% rendering gameplay around 30-40 FPS at 1080p using a GTX 1070 which would regularly get 80+FPS with XMP enabled. *Another strange thing to note is that with XMP profile disabled, whenever I set a cap on the framerate, the temperatures rise up to 100C with the GPU usage scaling upwards with the cap, but setting the framerate to unlimited brings GPU usage down and CPU usage up while at the same time bringing CPU temps down, so I'm completely at a blank.

I'm new to overclocking so I'm not very sure which clock speeds (for RAM or CPU) will stabilize performance while safely overclocking the CPU, but at the current settings I'm not entirely happy with the GPU performance (or understand why it's being underutilized) and unsure why the increase in RAM speed would drastically increase the CPU temps, even at full system fan speed.
 
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mamasan2000

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The memory controller is on the CPU these days, on both Intel and AMD. So if you raise DDR voltage or speed, CPU temp goes up.

I would take a look at your voltages. I wouldn't go over 1.35 volt on memory.
I don't know about CPU voltage since I've never owned an Intel CPU. I would guess around 1.3-1.35 volt max. At 5 Ghz OC.

Do you have chipset drivers installed?
Should be 2 different files.
 
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OminousD

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UPDATE: Apologies for updating an old thread, but I wanted to provide my solution to the long standing question. The pump was definitely the issue. I changed coolers from the H100i to the Cryorig A40 and everything is working as needed. I'm now at 4.6 GHz with XMP profile enabled and temps don't go beyond 65C under gaming load. Idol temps hover in the 35 - 45C range. The issue with GPU usage fluctuating has been eliminated as well (ruling out the CPU as the faulty component). The only compromise when switching coolers was the loss of the USB header to control fans via software. I'm okay with changing speeds in the BIOS as long as the temps are where they need to be.
 
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JCarax

JCarax

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There are a couple of things that cause the CPU to overheat with 7700K.

In my case I had my memory at 3000(X.M.P) and CPU at 4.8ghz(bios OC preset) and I was getting 36-40 Idle temps and 80+ on battlefield 1. My ambient around 20-25.

I disabled X.M.P, set the speed to 2666(with tigther timings) and removed the O.C profile. Enable turbo boost but disabled Cstate and speed step(so my cores at 4500 constantly).

Now the idle temp is around 29-34, CPU Z benchmark temp at 64 and battlefield 1(intesive 64 man maps) doesn't go above 70.

I tested this with lower ram speed and the CPU was even cooler.

Intel says any ram speed above 2400 will cause the CPU to run hotter and become less stable.

Haven't ran into any problems regarding stability with 2666 and 3000 but the former part is most definitely true.

 
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