H100i not performing well with a 8350

B3NDY

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Apr 18, 2014
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So I have a H100i on my 8350 and its mounted in the top of my case pushing air out the top and I seem to be having stupidly high temperatures on my CPU just at stock speeds and voltages.

I am using it on a m5a99fx motherboard and the VRM's get very hot on it so I set the fans up so the radiator was an exhaust bringing air away from the VRM's to keep them cool and I know this may effect the temperatures a little bit but I am still surprised at what I am getting.

So right now with a couple of tabs open on Chrome its reading at about 30C with the motherboard at about 45C. Now the motherboard is still a bit warm at idle for my liking but it will do, the worrying part is when it all gets under load. When I run Prime95 the CPU will get to 80C in around 30 seconds with the fans ramped up to max while the motherboard is getting to 75C at least, there is clearly something wrong but I'm not sure what.

Today I took off the water block, cleaned the cpu and the block itself and then reapplied some new thermal paste with the pea method to try and fix it but it hasn't made any difference. I'm fairly sure I've done it just how you're supposed to and I can't see any other reason why the temperatures are getting so hot. Iv felt the tubes and there is definitely a difference between one and the other so I know some kind of cooling is going on but how much I am not sure of. I need help with this because although it isn't at dangerous levels while gaming the fans have to get a lot louder then I would like and overclocking is definitely not an option for me right now.



Its been a day since I posted this and no answers but I have noticed something else, It is now idling at 45C and I haven't tried Prime again because even when it got to 80C it didn't look like it was slowing now. What I did notice was that even when it was at 80C the air coming from the radiator wasn't even warm compared to what it should be if it's running at those temperatures. There is a little bit just where the tubes entre the radiator part that gets very warm but the rest doesn't warm up at all. What I think has happened is the liquid isn't going through the radiator at all and while idling there is just about enough surface area of radiator being used to cool it down to 45C but as soon as its under load the little part of the radiator that is being used is no where near enough to cool the CPU. What I don't understand still though is when its under load the tube carrying the coolant back to the CPU feels cool so there must be some kind of cooling going on but that could just be compared to the other tube which was very warm so put off my comparison. If this makes sense to anyone else I would appreciate a reply because if it sounds okay I will contact Corsair about it.
 
Solution
I had the exact same problem with the H100i. I sent it back to Newegg the same day I received it. I am using the Antec KUHLER H20 950 now and it works great. It may have just been defective, but if I buy something defective I tend to just stay away from it all together, but that's just me. If you're willing to give it another chance, RMA it. It certainly is not working as it's suppose to in regards to your cpu temps. As far as your MB and VRM temps, make sure you do have good airflow across the motherboard and through your case. Remember that with this type of cooler, you're losing that direct airflow around the VRM that would be there if you were using a HSF on your CPU. The fans on your radiator pulling air through the top of your...
I had the exact same problem with the H100i. I sent it back to Newegg the same day I received it. I am using the Antec KUHLER H20 950 now and it works great. It may have just been defective, but if I buy something defective I tend to just stay away from it all together, but that's just me. If you're willing to give it another chance, RMA it. It certainly is not working as it's suppose to in regards to your cpu temps. As far as your MB and VRM temps, make sure you do have good airflow across the motherboard and through your case. Remember that with this type of cooler, you're losing that direct airflow around the VRM that would be there if you were using a HSF on your CPU. The fans on your radiator pulling air through the top of your case are not necessarily drawing adequate airflow across your VRM HS.
 
Solution
Just as an update, I got a replacement and the process was simple and easy to do so on the whole it wasn't too bad. I have not fitted the new cooler and it is performing great, idling at around 30C and under full load not getting any hotter than 45C while the fans are all on a quiet mode so it is also whisper quiet. This is clearly a huge improvement on the old one so I would now highly recommend this cooler if anyone is interested in getting it, especially with the corsair Links software that works so well with it.