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High Watercooling Temps with 7950 Crossfire and two Corsair H50s + Kraken G10

post #1 of 10
Thread Starter 
I bought two Sapphire 7950 Vapor-X cards and decided to liquid cool them. I then purchased two Hydro H50 and Kraken G10's. Online I heard of people using a copper insert between the GPU and water block so I bought that also. For thermal paste I used Arctic Silver 5. I placed one radiator in the upper rear exhaust of my case and the other in the bottom front as intake. I have 4 x 200mm fans plus the two radiator fans and my CPU cooler so I am sure ventilation isn't the problem. I plugged the Pumps and fans into my motherboard while the 4 200mm fans are plugged into a hub running at 12v. It has been 4 days since installation. My temps on idle(GPU clock 300mhz) range from 35-42C, leaning around 40C during light internet browsing. My room temp is 74F.

The temps seem high, is there anything else I can do to lower them?

Build specs:
CPU: AMD FX6300 OC @ 4GHz + CNPS5x Cooler
MB: MSI GD65v2
GPU: Radeon 7950 CF Liquid cooled
RAM: 9GB 1600MHz DDR3
PSU: EVGA Nex 750b 750w PSU
Case: NZXT H630 + 2 x 120mm and 4 x 200mm Fans
post #2 of 10
Thread Starter 
I remounted the coolers and applied new thermal paste. I also tried a run without a copper insert and my idle temp was 45C. I then added 120mm fans to my radiators for a push/pull effect and created a shroud made of aluminum tape to direct airflow and this only helped by one degree. The idle was 34C. I am now believing that this is as low as they will get.

If anyone has some advice it would be much appreciated.
post #3 of 10
you don't judge effectiveness of watercooling by idle temperatures, the load temperatures are more important. watercooling doesn't necessarily have to be better during idle compared to heatsinks
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post #4 of 10
Thread Starter 
Quote:
Originally Posted by Dudewitbow View Post

you don't judge effectiveness of watercooling by idle temperatures, the load temperatures are more important. watercooling doesn't necessarily have to be better during idle compared to heatsinks

I ran Furmark using the Burn-in 1920x1080 15 min test and within the first 5 minutes my GPU temp was at 79C
post #5 of 10
I have an H55 on my r9 280x. Min. and Max temps today for my GPU were 33 and 56. Probably was around 95f today. I prefer you to tell use what temp it was running while playing games.

Yes, 95f was the room temp. biggrin.gif
post #6 of 10
Thread Starter 
I started up Metro Last Light and after about 10 minutes HWMonitor said max was 60C. My room temp has been around 74F
post #7 of 10
Seems a bit high but the h50 is bottom of the bin for water coolers.
Iv got 2 7970s with antec 620s and max they see is 65C with 1.3V and overclocked to 1300mhz.
VRMs see 68C with heat sinks on them and 120mm fan blowing onto.

Idles 28-31C. (same at stock since they down clock at idle)
Stock they dont go past 58C on core and 50C on VRM.
Room temp 62-64f

Did you check to see if your core is recessed into the shim around it. If it is then youll need to use a shim on the core to make good contact with water cooler.
post #8 of 10
Thread Starter 
Quote:
Originally Posted by bmgjet View Post

Seems a bit high but the h50 is bottom of the bin for water coolers.
Iv got 2 7970s with antec 620s and max they see is 65C with 1.3V and overclocked to 1300mhz.
VRMs see 68C with heat sinks on them and 120mm fan blowing onto.

Idles 28-31C. (same at stock since they down clock at idle)
Stock they dont go past 58C on core and 50C on VRM.
Room temp 62-64f

Did you check to see if your core is recessed into the shim around it. If it is then youll need to use a shim on the core to make good contact with water cooler.

Yeah the h50 is a bit low end but reviews online show them dropping r9 290 temps drastically near 20 degrees. I am using a shim currently. It's is cut to shape and is 0.6mm thick. Looks identical to the EK one online
post #9 of 10
Do the radiators feel hot to the touch?
If so then you know its the air flow though them isnt enough.
If they feel cool then its the contact to the die.
Open up GPU-Z and watch the VRM temps. Some software will display gpu temp as the highest reading sensor.
post #10 of 10
Thread Starter 
I think it might be the fans because the rear radiator fan spins up but doesn't blow air for crap. It doesn't even feel like air is coming through. If I was to upgrade say to NF F12 fans would I see a good change in temps. And yeah the radiator gets warmish hot and I can feel some heat on the tubes. The other one is really cold mostly cause the 2nd gpu doesn't start until something intensive is happenning
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