High water temperature O11D Evo Reflection 2 Distro

As numpty said, there's absdolutely 0 chance that remounting the GPU will cause loop temps to go down, that's all about how much heat you're effectively transferring from one medium to another in a given time.

It seems to me like there are 2 potential factors, possibly in combination: something weird is happening with airflow in the case that's starving the rads of cool air, or the rads just don't have the capacity to get rid of as much energy as you want them to (or a combination of both).

Have you tried both rads as intake with the side and rear as exhaust? Or your current setup with the rear as intake as well?

I would think that both rads as intake with no filters would be your absolute best case scenario, you could even take the side panel off to see what your lowest achievable temp delta is and then work from there.
 
Parsley said:
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.
Click to expand...
The temp sensor is an aquacomputer next flow and is located right on the Distro with flow coming from the CPU that last visited the GPU from what I can tell. I did think about that slight temp difference across the loop. 4C would be a fairly good saving.
 
I don't think anyone thinks his loop temp will go down due to a remount, but the GPU temperature seems to be higher than it should be, so a remount may help with that.

It could also be restriction in the loop, but I don't think the loop has enough in it to be flow restricted, unless there is a kink somewhere perhaps. I've never used a distribution plate though, not sure how that may effect things.
 
Last edited:
SirConfused said:
As numpty said, there's absdolutely 0 chance that remounting the GPU will cause loop temps to go down, that's all about how much heat you're effectively transferring from one medium to another in a given time.

It seems to me like there are 2 potential factors, possibly in combination: something weird is happening with airflow in the case that's starving the rads of cool air, or the rads just don't have the capacity to get rid of as much energy as you want them to (or a combination of both).

Have you tried both rads as intake with the side and rear as exhaust? Or your current setup with the rear as intake as well?

I would think that both rads as intake with no filters would be your absolute best case scenario, you could even take the side panel off to see what your lowest achievable temp delta is and then work from there.
Click to expand...
Have tried all sorts of orientations and both intake actually gave worse temps. I think it’s a probably a perfect storm of problems.
 
Are your rads bled? If theres lots of trapped air that will hinder their ability to remove heat.

Also post of a picture of your system so we have a better idea of what we are working with.
 


d5g7QsG.png
 
I find my 4090 runs a lot cooler than my 3080ti did, my loop temps are around 33 degrees when gaming and my GPU temps are around the high forties/ low fifties so your temps are quite a bit higher than mine and I have a 280mm rad and a 360mm rad so my cooling area is less than yours too.
Have you tried top, bottom and rear fans as intake and side fans exhaust? This might help encourage air flow where rear and side fans both set to exhaust are working against each other.

[edit] just seen you don`t have a fan on the rear so forget that.
 
Last edited:
Sorry, don't have a good up to date picture and need to move the PC to get at it! The build is the same as in the top pic but with the GPU in the loop as below image and with all rad fans outtake. Also, the screen is now a 120mm outtake fan. I had a lot of fun turning the bottom ones to outtake without removing the GPU!
 
Last edited:
Gavster said:
I find my 4090 runs a lot cooler than my 3080ti did, my loop temps are around 33 degrees when gaming and my GPU temps are around the high forties/ low fifties so your temps are quite a bit higher than mine and I have a 280mm rad and a 360mm rad so my cooling area is less than yours too.
Have you tried top, bottom and rear fans as intake and side fans exhaust? This might help encourage air flow where rear and side fans both set to exhaust are working against each other.

[edit] just seen you don`t have a fan on the rear so forget that.
Click to expand...
Yeah, I have tried all sorts of combos including that and nothing makes it better, only worse. Best temps are both rads outtake and 3 intake at the side. I just left the back fan outtake for the moment. Out of interest what is your hotspot delta like under load?
 
Last edited:
0121danwilliams84 said:
Yeah, I have tried all sorts of combos including that and nothing makes it better, only worse. Best temps are both rads outtake and 3 intake at the side. I just left the back fan outtake for the moment. Out of interest what is your hotspot delta like under load?
Click to expand...
I`ll get back to you on that tonight as I can`t remember off the top of my head. I`ll run a couple of runs of Timespy to get it nice and warm then look at the temps, last time I looked they were pretty good.
On another note I`ll be installing my new AM5 mobo and 7800X3D tonight once I`ve done that :D
 
Gavster said:
I`ll get back to you on that tonight as I can`t remember off the top of my head. I`ll run a couple of runs of Timespy to get it nice and warm then look at the temps, last time I looked they were pretty good.
On another note I`ll be installing my new AM5 mobo and 7800X3D tonight once I`ve done that :D
Click to expand...
Nice work! make sure you update that AM5 bios ;). Beautiful chip.
 
0121danwilliams84 said:
Nice work! make sure you update that AM5 bios ;). Beautiful chip.
Click to expand...
I've already done the bios with q flash+ ;) and I've just drained the system ready for the transplant :D
I've just run timespy extreme 4k three times and my temps are gpu temp 65 degrees, memory junction temp 48 degrees and the hotspot temp was 80 degrees.
My coolant temp was 30 degrees.
 
Gavster said:
I've already done the bios with q flash+ ;) and I've just drained the system ready for the transplant :D
I've just run timespy extreme 4k three times and my temps are gpu temp 65 degrees, memory junction temp 48 degrees and the hotspot temp was 80 degrees.
My coolant temp was 30 degrees.
Click to expand...
Wow that’s quite a temp delta between water and gpu load. Sounds pretty much the same as my temps but with apparent 45c water.
 
Maybe try some larger feet on your case. That bottom rads fans should be set to intake regardless of anything else in your setup, that is easily the best way to have cool air going over that rad and into your system. The side fans could be a hinderence. I would also make the top rad exhaust so the air goes straight from the outside of the case over 2 rads and then out. If you are worried about extra heat on motherboard vrms etc then maybe make the rear fan an intake or exhaust. I'm no aerodynamics expert but them side fans could cause any cool air to not hit the top rad reducing its effectiveness.

Have you got the loop running through the blocks in the correct direction? Cpu block will have an in and out port and so do many gpu blocks they might add/remove a good 2 to 4 degrees each if not oriented correctly. I've never used a flow metre but I have to ask does that have a correct flow direction?

I did have that case but with a lot less demanding components and tbh I wasn't overly impressed with the cooling performance of it. It was great to work inside of.

I've noticed before an air bubble around my pump and that led to higher loop temps very quickly.

I think the rule was one fan slot of rad space (120mm) per 100 Watts of cooling needed.
 
Last edited:
Just a little update. My room temp today was 23c and I haven’t used the PC in a week and it has been turned off. The temp sensor stays on via USB when the pc is shutdown and currently reads around 40c. That seems like such a massive difference between room and water temp when not even in use.
 
D1craig said:
Maybe try some larger feet on your case. That bottom rads fans should be set to intake regardless of anything else in your setup, that is easily the best way to have cool air going over that rad and into your system. The side fans could be a hinderence. I would also make the top rad exhaust so the air goes straight from the outside of the case over 2 rads and then out. If you are worried about extra heat on motherboard vrms etc then maybe make the rear fan an intake or exhaust. I'm no aerodynamics expert but them side fans could cause any cool air to not hit the top rad reducing its effectiveness.

Have you got the loop running through the blocks in the correct direction? Cpu block will have an in and out port and so do many gpu blocks they might add/remove a good 2 to 4 degrees each if not oriented correctly. I've never used a flow metre but I have to ask does that have a correct flow direction?

I did have that case but with a lot less demanding components and tbh I wasn't overly impressed with the cooling performance of it. It was great to work inside of.

I've noticed before an air bubble around my pump and that led to higher loop temps very quickly.

I think the rule was one fan slot of rad space (120mm) per 100 Watts of cooling needed.
Click to expand...
Apologies for the late response to your detailed message!

Pretty sure the loop order is correct as it doesn’t really look right any other way and I copied a build pretty much exactly on the EK website.

The flow meter apparently works in both orientations but I believe is going left to right. With a longer run before hitting the meter itself.

Have tried quite hard to completely get rid of any possible bubbles.

Is quite confusing, but I guess it is a sum of multiple possible issues leading to poor performance.
 
0121danwilliams84 said:
Just a little update. My room temp today was 23c and I haven’t used the PC in a week and it has been turned off. The temp sensor stays on via USB when the pc is shutdown and currently reads around 40c. That seems like such a massive difference between room and water temp when not even in use.
Click to expand...

Unless PC was sat in direct sunlight then that doesn't seem accurate. I would expect water temp to sit at ambient temps while system is off.
 
stooeh said:
Unless PC was sat in direct sunlight then that doesn't seem accurate. I would expect water temp to sit at ambient temps while system is off.
Click to expand...
Sunlight is a good shout - maybe the sensor itself is black and in sunlight?

Water won't flow without a pump so even with sunlight I wouldn't expect the water temp to go up much.
 
You must log in or register to reply here.
Back
Top Bottom