Water cooling question???????

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Alan11985

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I have a i7 8700k in a custom loop with a 240mm crossflow radiator with 2 ll120 fans on it
I have a graphics card directly below the radiator so the heat rises into the radiator heating it up.
The case I use has very little airflow as it is all glass
Am I best including the graphics card into the loop or leaving it as is. ( I cannot install a bigger radiator)

The graphics card gets very hot and the fans on the card do very little
I am about to replace the card with the same brand but the 1080 so want to know if I should buy the water-block at the same time.
 
Solution
Eximo
4.9Ghz Tom's gave their 8700k ~170W and it was throttling. So 200W isn't too far off...

A GTX1080 is literally double the silicon of a GTX1060, that is going to be 200W plus at stock, and then some with an overclock.

Typical all brass/copper 120mm radiator is rated for about 200W per 120mm, assuming decent ambient air temperature.

In your situation, if you were to add a GPU block, would you then have more room for a thicker 240mm radiator? Increase the thickness and you might be okay with the 1080 in the loop.
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Eximo

Eximo

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I would say start with the full specs, maybe pictures as well to give everyone a better idea. What kind of temperatures are you seeing? Are you trying to overclock?

Typical rule of thumb is a 120mm for each component as a bare minimum. If you don't overclock, it might work out. I wouldn't trust a 240mm with an 8700k and a 1080 if you were shooting for 200W from the CPU and 300W from the GPU...
 
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Alan11985

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I don't want to over clock gpu but the cpu is overclocked to 4.9ghz
I currently see on a 1060 with 70% fan speed 78 degrees for gpu
cpu hits about 78 degrees(On gaming) not stress tests
The loop gets to about 34 degrees on cpu alone stress test
the loop gets to 42+ with the gpu getting hot like it does now
 
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Eximo

Eximo

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4.9Ghz Tom's gave their 8700k ~170W and it was throttling. So 200W isn't too far off...

A GTX1080 is literally double the silicon of a GTX1060, that is going to be 200W plus at stock, and then some with an overclock.

Typical all brass/copper 120mm radiator is rated for about 200W per 120mm, assuming decent ambient air temperature.

In your situation, if you were to add a GPU block, would you then have more room for a thicker 240mm radiator? Increase the thickness and you might be okay with the 1080 in the loop.
 
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Alan11985

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Thanks for your help.
I don't have room for a bigger radiator.

I might change the case to sort sort the airflow problem
 
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n0ns3ns3

n0ns3ns3

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Though already marked as solved, it is hard to recommend something without actually seeing your system.
In theory, a 240 rad can handle both CPU and GPU, though the system will not be quiet or not that cool under load.
overclocked 8700K and GTX 1080 gaming load, you are looking at 250-350w. So even without case (perfect airflow), a 30mm thick 240 rad will have to be paired with ~2000RPM fans to dissipate that heat with 10C delta between coolant and air.
In a gaming load the GPU will be about 10C over the coolant with a full cover block. So assume your room temps 25C + 15-20C for coolant + 10C GPU you will endup with GPU @50-60C and a CPU in 60-70C.
There are ways to improve the airflow.
For example if the intake is on the bottom of the case, raising the case few centimeters will do wonders. or/and vertically mounting the GPU may improve things even further.
 
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