I7 6700K + Corsair H100i v2

michaelyum · Mar 2, 2016

I have switched from using Noctua NH D15 to Corsair H100i v2 to reduce the chasis temperature to accomodate my 2 GTX 980 Ti.

When I did the realbench stress test, the reported CPU temperature shot up to 88 degree celsius. My pc crashed twice before the 10 mins mark and barely passed a 15 min test. When I did thr same test with Noctua NH D15, 7x degree is the max I could get.

I know in reality, i won't get as high temp as i got in stress test. But is this the kind of performance i should expect from H100i v2? Could someone share his experience? I was looking to replace my GPU stock fan with Corsair liquid cooler. This performance really worries me.

I saw in Corsair website that thermal compound is pre-applied, so i didn't apply any thermal compound, which I have. Should I apply thermal compound myself?

Besides, i tried to gently tap the mount and felt it's secured. Don't know if the mounting could cause the problem.

michaelyum · Mar 2, 2016

By the way, i just realized that the temperature reported by Corsair Link is only around 40 degree (i guess it's the water temperature) when the CPU is 80 degree. Does this tell what's wrong?

Chugalug_ · Mar 2, 2016

michaelyum :

That is the kind of temp I would expect. The H100i isn't a very strong water cooler imo given the fact that there are several midrange air coolers than can outperform it. At the point where you have an GTX 980ti SLI setup, i'd invest in either:
A. A bigger better case (such as the Master Case Pro 5)for increased airflow and some noctua fans.
or B. Custom or closed loop water cooling for your GPUs and some ek water brackets.

Gamer1985 · Mar 2, 2016

Im not sure where you get the opinion that the H100i isnt a strong CPU cooler. Mine keeps idle at 20-23C amd Realbench stress test no higher then 58C and thats with my Overclock of 4.6Ghz. Its a solid CPU cooler.

OP yours does seem a little hot. Do you have any case cooling? SLI 980 Tis are going to generate lots of heat, so you should have adequate case fans to dissipate the heat coming off of them. You could try re applying thermal paste, reseating the liquid cooler mount. Make sure it is not super tight, finger tighten the screws until theyre secure.

Realbench is not a super hot benchmark so you should be a little cooler. What are your idle temps?

fabiodrm · Mar 2, 2016

make sure both fans on raditor are removing air from your case.
are all fans spining?

michaelyum · Mar 2, 2016

Thanks, guy. Seems I will have to try to remount the pump. By the way, could someone tell me what's the normal differential between CPU temp and pump temp? In my case, a difference of 40 degree sound a bit strange.

I have 4 stock fans (3 120mm pushing air in and 1 1400rpm pulling air out) running other than the 2 corsair fans (configured to push hot air out of the case). All fans are spinning. I have to say even i turned the 2 corsair fans to max, which is super disturbing, i still got that 8x degree.

I read a lot of reviews before making the purchase. Most reviews auggest that i should expect temp of lower 70 degree under load. Though i don't know what exactly is "under load". 88 degree is definitely not something I was looking for.

fabiodrm · Mar 2, 2016

are your pump running too? how much rpm?

michaelyum · Mar 2, 2016

Corsair link reported the pump running at around 2000rpm. Could it be faulty? Any way to find out?

fabiodrm · Mar 2, 2016

remount your cooler.. maybe its not placed correctly over the cpu.
i already saw a single hair between cpu/waterblock cause high temperatures .

im using H80I GT with pre applyed thermal compound and i got 50ºC with full load (OCCT Test)

fabiodrm · Mar 2, 2016

another thing to do:
while your system is running, rotate your case, it will make possible air bubbles to move

michaelyum · Mar 2, 2016

In addition, according to Corsair Link, the CPU temperatures are roughly 20 degree (close to ambient temperature) at idle. I do spot that the temperature for particular cores did jump by 10-20 degree for half a second and then fall back. Other than that, the temperatures look normal.

Gamer1985 · Mar 2, 2016

You seem to have adequate case cooling, i still think in the 80s is high for real bench. Your idle temps in the 20s is great and where they should be. Try using HWInfo, HW Monitor, core temp etc. Under load temps is exactly what it means, any activity that puts your CPU at a higher processing state, like RealBench or gaming etc.

I would remove the mount, remove the thermal paste using alcohol, reapply thermal paste (not too much) and reseat the mount and finger tighten the screws until it is secure enough. Turn your fans and pump on max setting for now in Bios. Try and re-run realbench and see what your temps are in one of the monitoring softwares I recommended.

Do not use Corsair Link, the software is crap. It is only good for setting your RGB colors on your cooler. If you need to change fan speeds or pump I recommend doing it through the bios.

Gamer1985 · Mar 2, 2016

Im also concerned about you crashing. Even if you hit the thermal limit of your CPU, you wouldnt necessarily crash, it would just throttle the CPU to reduce temperatures.

Could you please list your system specs?

michaelyum · Mar 2, 2016

I have just remounted the pump but still getting those temp number within 5 mins of realbench stress test. The reason of crashing could be due to the program itself. It did crash even before the temp went sky high. Anyway, the temp I reported was from HWMonitor, which told me my Noctua NH D15 kept my CPU below 70 degree most of the time.

The temp of CPU shot up to over 60 degree within the first second of stress test and the pump temperature seemed to rise very slowly. Don't know if it's really dissipating the heat.

One thing bothering me is the back plate, when screwed, is still loose. But I heard that it is loose and shouldn't cause any problem.

michaelyum · Mar 2, 2016

Gamer1985 · Mar 2, 2016

What is your voltage set too for your 4.5Ghz OC?

And yes, the backplate that comes with the cooler has weird threading that doesnt really snug it up against anything to be secure, but it works as designed and no big deal as long as your cooler is properly installed.

michaelyum · Mar 2, 2016

Gamer1985 :

I have set it to 1.35V in adaptive mode

Chugalug_ · Mar 2, 2016

Gamer1985 :

Not saying that its a horrible cooler, saying that there are alternatives which outperform it in todays market, and that with SLI 980tis pumping out the heat, that is the temp you can expect.

michaelyum · Mar 3, 2016

Update:

I got an replacement for H100i v2, installed it, ran the Realbench stress test and still got those crazy temp no. After that...................

I have reduced the CPU clock speed back to original 4Ghz from 4.5Ghz. Besides, the core speed of my GPUs were reduced to basic 1000Mhz. I have managed to reduce the max temp of CPU achieved in the Realbench stress test was lowered from 88 degree to 77 degree. In game where CPU load is far less, the temperature will mostly linger below 70 degree. It's more in line with some of the review out there.

Conclusion : the heat produced by 6700K and GTX 980 Ti SLI is no joke!!!

My next step will be trying to dump part of the heat produced by my GPU out of the case directly using fan and radiator. I am thinking of a Corsair HG10 N980 + its liquid cooler. A full custom water cooling loop is too complicated for my taste now, I hardly find the parts I want in the country I live in. Even for Corsair HG10 N980, I have to buy from overseas supplier.

Gamer1985 · Mar 3, 2016

Well im glad it dropped, 10 degrees is substantial. May I ask, when you overclocked did you test the minimal voltages you could achieve or did you just jump right in and applied the 1.35? Im sure you could have had lower voltages with your overclock, mine is at 4.6Ghz at 1.29V. Of course not every chip is the same, just a thought. But of course, I can imagine the heat coming off of those SLI 980Tis. Thats the only reason I dont have mine in SLI, I wouldnt know how to cool them enough and dont really want to get into custom watercooling.

michaelyum · Mar 3, 2016

Gamer1985 :

I achieved 4.5Ghz with 1.35V, tested. Mine is not particularly impressive. Besides, my 2 GTX 980 Ti SLI were OC'ed to 1150Mhz. Insane performance and ....... temperature

mytzusky · Jul 1, 2016

I'm pretty surprised by the H100i v2 as well. In games it stays around 63-65 max (DOOM/Witcher3). In Cinebench 11.5 around 73 (only 2 degrees cooler if I set Performance profile on CorsairLink) and then in Prime 95 the animal goes to 95. From what I've heard Prime95 is bad for skylake cpus and somehow irrelevant but still... PS: Phanteks Evolv ATX (3 stock fans) + no GPU heat output (1070 FE).

DmC10 · Sep 9, 2016

When i first installed my h100i on a 2600k it run worse than my V6GT, 10 mins prime95 it reached 73 (my V6GT kept it at 67) during summer. So i saw the backplate moving too much and the screws in mobo's front side having way to much space to move, so i did put some washers between the backplate and the mobo, did the same prime95 bench after 10 mins the max temp it had reached was 54 celcious.

kid-smooth · Sep 10, 2016

I'm going to post the one thought i had the whole time I was reading everythingn, just to see if I'm the only one who thinks this.

However, IMO, one single 1400rpm fan does not seem adequate enough to push out all that hot air. I just feel like it's too weak. Is it a giant 200 mm fan?

psiclone · Sep 26, 2016

michaelyum :

So, you're measuring chassis temp, not core temp. That tells us that what you're measuring is ambient temp? If so, that's a very cool temp inside your case. If not, and it's the core temps from the processors, that's VERY high.

I7 6700K + Corsair H100i v2

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