Custom Loop Flow Rate Question / Issue

[ChrisLoudon]

Hi all,

 

Firstly, can I ask what would be a minimum flow rate for a custom loop cooling a 9900k and a 3080ti before it starts to affect thermals negatively? Both the CPU and GPU are OC'd but not massively. 

 

I have a recent build in a Hyte Y60, loop as follows:

 

Corsair XD5 Pump / Res > 3080ti > EK Coolstream SE120 > 9900k > EK Quantum Surface S360 > EK Quantum Surface X240M > Back to XD5.

 

I also have a Barrowch OLED flow meter and coolant temp sensor which even with the pump PWM speed set to full chat shows no more than 2L / min.

 

I wouldn't normally be worried but my thermals are much higher than expected and while I attribute this to the case sitting in an area that has very poor ventilation I was thinking that maybe poor flow rate was also a factor.

 

The 9900k is running at 5.1Ghz all core, delided and liquid metalled with temps hovering around 60-70C when gaming which I'm pretty happy with but my 3080ti keeps creeping up to 95C on the hotspot and 80ish on the core. I've re-seated the block and reapplied paste a number of times. I'm starting to look at under-volting the GPU but just wanted to check that flow rate wasn't a major factor.

 

I have another dual-loop build in a Tower 500 with 2 Barrowch sensors showing upwards of 7L / min on each loop which is clearly much higher than my Hyte one.

 

Any ideas?

 

Cheers

 

Chris

[thrasher_565]

flow rate is not normally a problem any more. 1 gpm is good enough. thoe each gpm you get is about 1c drop.

 

back in the day what what we did was get as much gpm but then the jet plate on cpu block was a think witch made a bottle neck for speed. but got good temps. and there were other problem of having so much gmp.

[fonzz1e]

imo barrow or bykski sensors are not really precise if u compare to aquacomputer ones

 

however the main object is keeping your components cool, if yer cpu & gpu are decently cool on max load then yer good... that said how are your fans configure; are they pulling fresh air into the case or exhausting, u can easily test it by removing the glass panel & load test (if temp drops it means yer current fan setup is not gettin enough fresh air pass yer rads)

 

from my exp my d5 pump does dump some heat into the loop when u run them max out, my coolant temp increase by 1-2c when i max out the d5

[ChrisLoudon]

Thanks for the info guys.

 

I think I'll tinker with my fan setup as taking the main glass side panel helped a lot.

 

The main issue is clearance round the case as it sits in a custom MDF AV unit with only 2-3 cm of space at the side, rear and top.

 

As it stands the case sites side on with the rear, top and back side of the case close to a surface.

 

Rear 120mm rad is intake (push/pull). Top 360 is intake (pull) and side is exhaust (push/pull).

 

I know that the rear and top would typically be exhaust but with pretty much all rad sided surfaces stuck against a wall / surface, I kinda thought that might cause issues.

 

See pic below to give you a better idea of positing.

 

Happy to hear any suggestions on fan config.

 

Cheers

 

Chris

[RevGAM]

You're covering most/all of your vents with that positioning. You're always going to have temp problems if you don't resolve that. I suggest positioning it on an angle if you can't relocate it or turn it 90 degrees.  At the very least, move it forward to the lip of the shelf and to the right. 

 

I hope that the particulates in that colorant don't start falling out and filling areas. 

[ChrisLoudon]

17 hours ago, RevGAM said:

At the very least, move it forward to the lip of the shelf and to the right.

Thanks buddy.

 

I can move the case another couple of cm's forward which will give a bit extra breathing space and I think I can reduce the size of the half shelve to move it further right. I don't remember the last time I booted up the PS4 so can relocate that without issue.

[thrasher_565]

16 hours ago, ChrisLoudon said:

Thanks buddy.

 

I can move the case another couple of cm's forward which will give a bit extra breathing space and I think I can reduce the size of the half shelve to move it further right. I don't remember the last time I booted up the PS4 so can relocate that without issue.

how is the fans setup? looks like the back is intake and side exhaust but what about the bottom and top? 

[ChrisLoudon]

11 hours ago, thrasher_565 said:

how is the fans setup? looks like the back is intake and side exhaust but what about the bottom and top? 

Yeh, back is intake, side exhaust, top is currently intake and bottom also intake.

 

I know that the top really should be exhaust but I was worried that with the limited clearance I might get better performance with that being an intake and just keeping the side glass window off.

 

The result right now is very good as my temps have dropped dramatically.

 

C