New Open Loop Build - Hot GPU (4090 FE)

bthitman

bthitman

bthitman

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Similar to @0121danwilliams84 's thread (https://forums.overclockers.co.uk/t...rature-o11d-evo-reflection-2-distro.18972103/) about high temps. I didn't want to hi-jack that thread though!

I think I know the answer, but I want to ask to be sure.

What I think the answer is:
I think I need to fit the 360mm 30mm rad I have. Even though it's getting cramped in the case!

This is my first open loop build. Specs are:

- Hyte Y40 case
- 7800X3D (EKWB CPU block)
- Nvidia 4090 FE (EKWB GPU block)
- Hardware Labs Black Ice Nemesis GTR 240 (https://hardwarelabs.com/hwlmain/nemesis/gtr/gtr-240/)
(55mm thick)
(which claims to have a capacity of 1100W)
- Lian-Li UNI AL 120 V2 fans

I have 4 fans on the GTR 240, in push-pull config. I also have 3 fans as intake from the top of the case, 1 intake from the bottom, and 1 more exhausting at the rear.

The GPU is running hot :( I ran the 3DMark Speedway stress test (20min) to get the GPU up to temp and stabilised. Results below.

StateAmbientGPUCPUWater
Idle23.7355136
After 20min stress test24.2697055

HWInfo states that the GPU was drawing about 430W during the test. And the GPU hotspot temp is about 8-10 degrees hotter than the core temp.

I also have a Harware Labs Black Ice Nemesis GTS 360 (30mm thick) that I *might* be a able to fit, but if I do get it in there, I will only be able to mount two fans to it (the third fan would interfere with the reservoir)

I will post pictures tomorrow, and my fan and pump profiles, if that will help.

Thanks!
 
One 240 rad is straight up nowhere near enough to cool those absolutely insanely hot components, even with the fans running at full tilt imo. You definitely want that second rad in there for a 7800X3D and a 4090 if you want the components to run cooler.

I will say that 70 is still fine for the CPU, as iirc the 7000 series target 100 degrees instead of a power consumption target (up to an eventual power cap). The GPU is harder to tell without more info, as the temp is fine but it might not be boosting as high as it could to maintain a reasonable temp. I'm not sure what the profile is on a 4090 for temps/boost scaling.
 
Yea... I think I was fooled by marketing! :cry: They made it sound like: 'this rad, being almost 60mm thick, and a double-pass, is like having 2x 240mm 30mm thick rads back-to-back!' So I thought 'great. 480mm of cooling. that should work' (facepalm)

*sigh* At least I haven't stripped my old PC yet! I'll need it whilst I'll drain the loop, order more hardline and fittings, and squish that 360mm in there as well

I was trying to do something a bit different with using a Hyte Y40 for this - but perhaps going down the route of 'another O11-D build' for my first open loop might have been a better option! :cry:
 
Interesting how the CPU reached 70C and the GPU reached 69C and you were only concerned about the GPU temperature!
Both CPU and GPU can run fine at high temperatures. You only need to worry about if they hit the clock throttle threshold because that will hit performance.
However I do agree with @Mcthommo that you need to be careful with water temperature in case it affects any of the components in the loop. The metal parts will be fine as long as expansion doesn't cause something to move, but you should ensure that the fittings and pipes are rated for high water temps.

FYI I have a HW labs black ice SR2 420 which is 60mm thick, but I also have an Alphacool XT45 420 and an Alphacool XT45 140, both 45mm thick. That's so that I can limit my water to 40C max and have a relatively low fan speed for quietness.
 
Be interesting how they tested that 1100w claim
That's the thing with numbers
Unless the exact methodology is given
You can claim just about anything

Online figures seem to vary
As to how hot before a risk of hard Tubing
Deformation
55c coolant is pretty toasty though
Yet to hit 40c on mine
Even on the hottest day this year
30--31c over ambient Isnt something i
would like to see my coolant at
And Unless you have air con
That ambient could get quite a bit hotter
Did you use inserts in the tubing?
 
therealdippy said:
Interesting how the CPU reached 70C and the GPU reached 69C and you were only concerned about the GPU temperature!
Both CPU and GPU can run fine at high temperatures. You only need to worry about if they hit the clock throttle threshold because that will hit performance.
However I do agree with @Mcthommo that you need to be careful with water temperature in case it affects any of the components in the loop. The metal parts will be fine as long as expansion doesn't cause something to move, but you should ensure that the fittings and pipes are rated for high water temps.

FYI I have a HW labs black ice SR2 420 which is 60mm thick, but I also have an Alphacool XT45 420 and an Alphacool XT45 140, both 45mm thick. That's so that I can limit my water to 40C max and have a relatively low fan speed for quietness.
Click to expand...
I probably shouldn't write posts after midnight! Yes, the GPU temp is high (for me - I was hoping for mid to high 50's) but it's the overall loop temp (water at 55, and sometimes higher!) is a concern.

As for the CPU at 70 - It is a 7800X3D, which I'm sure has a target operating temp of 90-100 degrees. So 70 (for me) is pretty good.
EDIT: the CPU at idle is about 50-52, so a delta of 20 degrees under load sounds ok (I guess!)

Thanks for the comparison! I'll experiment a bit with this build, and if still not happy, I might have to go with a different case and more cooling!
 
Last edited:
Mcnumpty2323 said:
Be interesting how they tested that 1100w claim
That's the thing with numbers
Unless the exact methodology is given
You can claim just about anything

Online figures seem to vary
As to how hot before a risk of hard Tubing
Deformation
55c coolant is pretty toasty though
Yet to hit 40c on mine
Even on the hottest day this year
30--31c over ambient Isnt something i
would like to see my coolant at
And Unless you have air con
That ambient could get quite a bit hotter
Did you use inserts in the tubing?
Click to expand...
Good points. I don't know the thresholds for the tubing, or the pump/reservoir. Never expected to be in the situation that I would need to worry about it! :cry:
No A/C in this room. Just windows and a fan if I need. The ambient did go up a degree during the test, clearly from the PC pumping the heat into the room.

"Inserts in tubing"? not something I'm familiar with, or know about. Can you enlighten me?
 
bthitman said:
Good points. I don't know the thresholds for the tubing, or the pump/reservoir. Never expected to be in the situation that I would need to worry about it! :cry:
No A/C in this room. Just windows and a fan if I need. The ambient did go up a degree during the test, clearly from the PC pumping the heat into the room.

"Inserts in tubing"? not something I'm familiar with, or know about. Can you enlighten me?
Click to expand...
same idea if you do plumbing
using push fit plastic piping you put inserts
in the tubing to stop deformation

www.overclockers.co.uk

EK Water Blocks EK-HD PETG Insert 12/16mm (10pcs)

Order EK Water Blocks EK-HD PETG Insert 12/16mm (10pcs) now online and benefit from fast delivery.
www.overclockers.co.uk www.overclockers.co.uk
 
60mm will never outperform or match dual 30mm rad, same fin density and similar design. Rad area is king.
I would go at least dual 360mm as the main focus for watercooling in mid/big sized case is noise level, and doing with a single 240mm rad is more like a mini itx/small format feat than actually a larger format system.
 
Yeah rad Surface area is more important
Than thickness
If you can have the area and bit of extra thickness
as well fair enough

Should double check
Did you use PETG tubing?
Acrylic isn't likely to deform much in hot temp
Though 60c also sounds familiar for pumps
As a limit
With everything there's usually a bit of leeway/safety margin
If 60c is given as a limit
I wouldn't expect it to suddenly fall apart
The instant it hits 60c
Though lab testing of stuff may also
Be done differently from real life use
Since there's so many different configurations
Possible
And so many different manufacturers of PETG tubing

Yours is still too hot regardless
Since summer temperature could hit a lot higher yet
Not sure you picked the best pc case
In terms of radiator support
 
Thanks all. Yea, @Mcnumpty2323 I feel your last comments are correct!

1) I'm using PMMA (Corsair Hydro X Series XT Hardline)
2) Yes, the whole loop is too hot, and not safe for the pump or the fittings, or the tubing :)

I was really trying to do something different and unique with this build. HOWEVER, maybe (clearly?) I bit off more than I could chew for my first build :cry:

So I have scrapped it (it's still a great case! And would do air-cooling / AIO very well!) and I'm going to go down the route of 'the simplest answer is most often the best.' For my first (re-?)build of open loop, I'll pick up an O11-D case. Start again. And will give me the opportunity to maximise rad coverage.

Just goes to show that no matter how much research is done, there is no substitution for experience!

Whilst I'm frustrated that my plan didn't pan out; I'm still enjoying this new hobby.

I don't think I can fit an O11-D EVO in my space, so will go with the original model. Just need to research what will fit! The EKWB for the 4090 FE says it's 155mm tall - need to make sure that will fit in the O11-D. And also check how thick a rad I can put in each location. Etc. Etc.

Will keep this thread posted!
 
We live and learn
All of us old timers at watercooling
We made mistakes along the way too
Probably more mistakes than you
Way back then we had no forums no youtube etc
Far less parts were available
So a lot of our stuff was primitive by today's standard

Main thing is this has given you
Some experience
Which as you correctly said nothing substitutes
For hands on practice
And even more importantly
You accept you got something wrong
And will adapt from that
And we are all here if you're unsure about something :)
 
Mcnumpty2323 said:
We live and learn
All of us old timers at watercooling
We made mistakes along the way too
Probably more mistakes than you
Way back then we had no forums no youtube etc
Far less parts were available
So a lot of our stuff was primitive by today's standard

Main thing is this has given you
Some experience
Which as you correctly said nothing substitutes
For hands on practice
And even more importantly
You accept you got something wrong
And will adapt from that
And we are all here if you're unsure about something :)
Click to expand...
Too kind! These past couple of hours, I have been digging up more and more info (on measurements mostly!) Looks like a 4090 EKWB water block will NOT fit an O11-D (in horizontal)
4090 in O11-D EVO -> "Essentially, most 4090 RTX with water blocks don’t fit O11D and barely fit O11 Evo."

So now not sure what to do!

1) O11-D, with a vertical mount? But then can't mount a rad on the bottom (unless it's mega-thin, and thin profile fans!)
2) O11-D EVO and source an adapter for the GPU power, so the cable is not crammed up against the glass

The cost of an O11-D + vertical mount is MORE than an EVO :cry: But an EVO is just that little bit wider that it makes it awkward for where it fits in my desk setup. (*sigh* 1st-world problems, eh?! :cry:)

Thoughts? At this point, I'm leaning towards EVO. Just getting the system up and running again, and dealing with the physical size of the case...
 
Last edited:
Luckily for me
I don't have any constraints
As to size of case I can use
Currently an 011d xl
But have had full towers before
Like enthoo primo,enthoo luxe v1 and enthoo 719
I do like phanteks cases
So would look see if phanteks have anything of the
Dimensions you need
Nv7 probably too big though
Nv5 not sure how soon will be available to buy
But they have loads of models

Of your 2 choices
Probably the evo as should be able
To get gpu power adapters
Though would obviously make sure of that before buying
 
Mcnumpty2323 said:
Luckily for me
I don't have any constraints
As to size of case I can use
Currently an 011d xl
But have had full towers before
Like enthoo primo,enthoo luxe v1 and enthoo 719
I do like phanteks cases
So would look see if phanteks have anything of the
Dimensions you need
Nv7 probably too big though
Nv5 not sure how soon will be available to buy
But they have loads of models

Of your 2 choices
Probably the evo as should be able
To get gpu power adapters
Though would obviously make sure of that before buying
Click to expand...
Ah! I had kinda stayed away from full-tower; but you enticed me to go have another look. My restriction (limitation) is to do with width, and the N7 is very narrow! (But very tall). The width is great for my location, and the height I think I can deal with. The length might be an issue.

So I will order one to see how it fits for me. And if it works, then I guess that's a great solution! There's even a picture on the Phanteks page that shows a mock-up of one of my ideas! Using an EKWB FLT 240 on the back of the case.

Thanks for the tip.
 
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