High water temperature O11D Evo Reflection 2 Distro

0121danwilliams84

0121danwilliams84

0121danwilliams84

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I have an O11D Evo Reflection 2 Distro with 2 360 radiators top and bottom with Corsair ML120 fans. Radiators all outtake seems to cool best with 3 side fans intaking and rear outtake. Cooling an RTX 4090 and Ryzen 7900x. All EK blocks.

I run the fans at 50% rpm and the D5 pump at 65%. That fan speed is the highest I can tolerate and I get 130l/hr flow and about 200 at 100% pump speed. Not much temp difference above certain pump speed.

The room temp is around 23c currently and the water temp always idles about +8c over ambient.

Under load the water temp currently gets to about 45c. Gets up to 40 within about 10 mins and creeps up slowly to settle there.

My GPU temps are the main worry getting to around 65c max at stock. Around 20c over water, which I have heard is fairly standard. The water temp just isn’t helping though. The hotspot temp is about +8 over core at idle and +15 load. Not great not terrible.

I can only get a few C cooler maxing the fans but that’s not tolerable.

I don’t think I want to try reseating the GPU. Anything else I could possibly try to lower the water temps other than AC?

Thanks.
 
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Nothing much you can do mate. You have the most power hungry gpu that has ever existed so 65c is pretty good. All changes you can possibly make will make at most 5c difference in temps. You do have choices but they won't make you any happier. More rad space, more fans (push/pull), faster fans (obviously = more sound).

Maybe get rid of the single exhaust fan and try allow more air to pass through the radiators.
Possibly have the bottom radiator in taking air.

You could try liquid metal TIM on the gpu which will probably be the biggest benefit you see. If you do go with that make sure you research it first.
 
I'd personally go with a more balanced approach to airflow rather than such a negative pressure. Maybe switching the bottom fans to intake would get you a bit closer, but ultimately as above... you're dumping 500W+ into 2 rads which is always going to be a challenge, especially if they're not the thick variety which you don't mention.

If you can fit push/pull that might help, but only if the fans are on the thicker side and you still want to run them at low RPM.
 
D1craig said:
Nothing much you can do mate. You have the most power hungry gpu that has ever existed so 65c is pretty good. All changes you can possibly make will make at most 5c difference in temps. You do have choices but they won't make you any happier. More rad space, more fans (push/pull), faster fans (obviously = more sound).

Maybe get rid of the single exhaust fan and try allow more air to pass through the radiators.
Possibly have the bottom radiator in taking air.

You could try liquid metal TIM on the gpu which will probably be the biggest benefit you see. If you do go with that make sure you research it first.
Click to expand...
Thanks for the feedback. I haven't tried removing the rear exhaust fan yet, but tried pretty much all other fan orientations. Intake on the bottom radiator didn't get better temps, with both rads intake or top rad exhaust. I do think a GPU reseat and re-paste would help, but not sure I am ready for the trauma of all that! :cry:
 
Seems a bit hot
Though I only have a 5950x
And a 2080ti
So kind of hard to compare as not as power hungry as your stuff
But few hours gaming yesterday
Max coolant temperature was 33c on mine
43c on gpu
Mid 50s on cpu
You're 45c coolant when it's not even summer yet seems high
Especially if you're using petg tubes
Though I did manage to squeeze in a 44mm
And a 58mm rad in push/pull in my 011d xl
Guessing you might be using 2 x 44mm?
Or maybe even a 30mm and a 44mm?
 
Mcnumpty2323 said:
Seems a bit hot
Though I only have a 5950x
And a 2080ti
So kind of hard to compare as not as power hungry as your stuff
But few hours gaming yesterday
Max coolant temperature was 33c on mine
43c on gpu
Mid 50s on cpu
You're 45c coolant when it's not even summer yet seems high
Especially if you're using petg tubes
Though I did manage to squeeze in a 44mm
And a 58mm rad in push/pull in my 011d xl
Guessing you might be using 2 x 44mm?
Or maybe even a 30mm and a 44mm?
Click to expand...
I think the 2080ti can still put out 350W and the 5950X pushes 100W+ in games.

I have two EKWB Surface P360 44mm rads, top and bottom.

Yeah, I think the water temps is the cause of most of the problems. Not sure if a bad GPU/CPU mount can push up water temp though, if that was the case.

I get pretty decent flow according to the flow meter, so flow shouldn't be an issue.

It's kind of puzzling really why the water temp goes so high. I start at the temps you have under load.
 
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Jay85 said:
Be interesting to see what your wattage is on your 4090?
Click to expand...
Hi Jay, this is just at stock 450W in a heavy load game like f1 2022 or Hogwarts Legacy or Superposition (The game option of that benchmark keeps it pegged at 450W most of the time, so was good for testing.)

Running at 4K on a 144hz screen.
 
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0121danwilliams84 said:
Hi Jay, this is just at stock 450W in a heavy load game like f1 2022 or Hogwarts Legacy or Superposition (The game option of that benchmark keeps it pegged at 450W most of the time, so was good for testing.)

Running at 4K on a 144hz screen.
Click to expand...

I dont know if any other or how much any other factor plays into it but my 3090 draws around 365w and on a 1080 radiator (3x360) external setup on a game like cyberpunk 2077 my gpu temps never pass 42c with water temps sitting around 26c.

Probably not a good comparison as im sure the 4090 die size is quite abit bigger maybe which might play into it somewhat. It just seems rather high to me to be sitting at 65c on a watercooled gpu.
 
Yeah would have thought 50c--55c maybe
For 4090 watercooled ?
You tried with side panel off?
Just to rule out airflow
Or remove the filter from the 3 intake fans
The ones not on radiator

May just be 2 x 44mm x 360mm simply isn't enough rad
For that cpu and gpu?
Though again just guessing as I have nothing similar to compare
 
Jay85 said:
I dont know if any other or how much any other factor plays into it but my 3090 draws around 365w and on a 1080 radiator (3x360) external setup on a game like cyberpunk 2077 my gpu temps never pass 42c with water temps sitting around 26c.

Probably not a good comparison as im sure the 4090 die size is quite abit bigger maybe which might play into it somewhat. It just seems rather high to me to be sitting at 65c on a watercooled gpu.
Click to expand...
For comparisons sake I have a 3090 pulling about the same watts as Jay, with 2x360 and 1x280 rads built into a case alongside a slightly overclocked 13700k. My water temperature with my fans set to be very quiet under load(the rpm is quite low) floats around 30 degrees with my GPU Core never topping 42-43.

I do have an extra rad compared to yourself, but mine are all EK P series Xflow rads, and I just don't see there being such a difference in temperatures on the GPU there.

65 does seem high for a GPU under water, they don't have the same heat density problems as a CPU. As you say, try remounting your block with your best effort for even mounting pressure around the core.
 
Mcnumpty2323 said:
Yeah would have thought 50c--55c maybe
For 4090 watercooled ?
You tried with side panel off?
Just to rule out airflow
Or remove the filter from the 3 intake fans
The ones not on radiator

May just be 2 x 44mm x 360mm simply isn't enough rad
For that cpu and gpu?
Though again just guessing as I have nothing similar to compare
Click to expand...
I think it's enough and his water temperatures aren't dangerous. The 7900x isn't fantastic power wise, but it's certainly not the worst, pulling about 195watts under a full load like cinebench if I remember it right. It'll be absolutely fine when gaming.

One quick question Dan, since you're focussed on negative pressure, are your intake fans covered by a fine mesh? If those fans are restricted too much it won't be helping your temperatures at all, and I saw not insignificant results when I was just playing around with my Lian Li Lancool 3 and removing the fine mesh filter on the front of it. I just use the metal ventilated front panel now and give the computer a clean a little more often, keeps things quieter.
 
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Parsley said:
I think it's enough and his water temperatures aren't dangerous. The 7900x isn't fantastic power wise, but it's certainly not the worst, pulling about 195watts under a full load like cinebench if I remember it right. It'll be absolutely fine when gaming.

One quick question Dan, since you're focussed on negative pressure, are your intake fans covered by a fine mesh? If those fans are restricted too much it won't be helping your temperatures at all, and I saw not insignificant results when I was just playing around with my Lian Li Lancool 3 and removing the fine mesh filter on the front of it. I just use the metal ventilated front panel now and give the computer a clean a little more often, keeps things quieter.
Click to expand...
I have a 360mm fan filter on the side fans. Will give that a go too. Anything simple I can do to avoid taking the loop apart!
 
Parsley said:
For comparisons sake I have a 3090 pulling about the same watts as Jay, with 2x360 and 1x280 rads built into a case alongside a slightly overclocked 13700k. My water temperature with my fans set to be very quiet under load(the rpm is quite low) floats around 30 degrees with my GPU Core never topping 42-43.

I do have an extra rad compared to yourself, but mine are all EK P series Xflow rads, and I just don't see there being such a difference in temperatures on the GPU there.

65 does seem high for a GPU under water, they don't have the same heat density problems as a CPU. As you say, try remounting your block with your best effort for even mounting pressure around the core.
Click to expand...

edit:
ignore what i just wrote lol. Realised you was comparing to Williams setup.
 
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.its possible remounting the gpu might
Lower its temps a bit
But can't see how a bad gpu mount would increase
Coolant temperature
If anything I would expect the opposite
Since better mount would mean more heat transfer to coolant?
Would still assume airflow or amount of radiator might be the culprit
Guess if you remove all the filters
And side panel too just to see what happens
Would be what I would try before remounting the gpu
Since its easier anyway
 
Mcnumpty2323 said:
.its possible remounting the gpu might
Lower its temps a bit
But can't see how a bad gpu mount would increase
Coolant temperature
If anything I would expect the opposite
Since better mount would mean more heat transfer to coolant?
Would still assume airflow or amount of radiator might be the culprit
Guess if you remove all the filters
And side panel too just to see what happens
Would be what I would try before remounting the gpu
Since its easier anyway
Click to expand...
No filters on there now as per Parsleys suggestion. Only had one filter on there anyway.

That's what I was thinking that the GPU mount wouldn't increase coolant temp.

I can keep it under 40C with fans at 100% 2,400rpm, but that's crazy.

I start out with water temps in the low 30s to start with so, it just goes up from an already high level which is the most confusing thing.

I am guessing the case with glass panels and distro just retains the heat really well.
 
0121danwilliams84 said:
No filters on there now as per Parsleys suggestion. Only had one filter on there anyway.

That's what I was thinking that the GPU mount wouldn't increase coolant temp.

I can keep it under 40C with fans at 100% 2,400rpm, but that's crazy.

I start out with water temps in the low 30s to start with so, it just goes up from an already high level which is the most confusing thing.

I am guessing the case with glass panels and distro just retains the heat really well.
Click to expand...
If it's of any help, my fan set up is

3x140 on the front as intake, 2 of these are on a 280mm rad.
3x120 intake on the bottom 360 rad. They intake through the basement of the case, you'd have to look at the case to get a better idea.
3x120 exhaust on the top 360 rad.
1x140 exhaust on the rear of the chassis.

I don't run push pull as I don't have the space!

I've set it up so it runs at a slightly positive pressure in terms of the fan speeds.

The rear fan as exhaust is mostly to ensure a bit more airflow when the system is idle and the fans are barely spinning.

Another thing to consider is what is the location of your temperature sensor? It averages out over the loop, so it doesn't really matter, but when I had a sensor before the GPU + CPU, and then another one after, the delta between the two was around 4 degrees. Going through all of the radiators does cause a temperature drop across the loop, especially if running at a low pump speed with only one pump (in series). I only mention it as it may alter your perception of your loop temperature slightly.
 
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