PC case gets up to 50C while system is under load

[OddOod]

So, since I built this loop about 18 months ago, the case gets wicked hot while I'm mining or heavily gaming. Like, 50C (120F) while the coolant is only 65-70C.

Specs/loop order: EK D5 pump > Distro plate > 8700K > EVGA 3080Ti > Thicc 280 rad w/ 2x fans @ 1200RPM (70%) intake > Normal 280 rad w/2 fans @ 1200 RPM (70%) > Distro plate pt. 2 > Pump
all built in a Phanteks P500 (would not recommend for custom loop) with 19mm low maintenance softline tubing. 

I'm running everything at about 70% speeds and even cranking stuff up to jet engine levels only seems to drop the case temp a few C. Coolant flow is solid and aside from the hot case, everything has been mint

Is this.... normal? I mean, it's kinda great in the winter, but in the summer it's nigh unbearable. 

Thanks for any advice!

[Levent]

Sounds normal to me. I scale my case fans speeds upto 55c internal temperature.

[OddOod]

14 minutes ago, Levent said:

Sounds normal to me. I scale my case fans speeds upto 55c internal temperature.

like, your case is hot to the touch? 

[Levent]

2 minutes ago, OddOod said:

like, your case is hot to the touch? 

Yes

[OddOod]

2 minutes ago, Levent said:

Yes

Awesome, thanks! Just seemed strange

[MaratM]

what is the coolant temp at full load?

[OddOod]

1 hour ago, MaratM said:

what is the coolant temp at full load?

70C usually. If it's wicked hot in the room (like 95-100F) it can get up to 75C 

[MaratM]

1 hour ago, OddOod said:

70C usually. If it's wicked hot in the room (like 95-100F) it can get up to 75C 

This is very bad, with collant temp around 70C your cpu must clock itself down to 3ghz, usually 8700k if delidded runs around 30-40c above coolant. If your coolant is around 70c your cpu must hit 100c and this is very bad for cpu. Get a temp sensor in your cooling loop. The worst what can happen are:

your pump dies due to overheating, one of the tubes comes off one of the fittings and in a best case it is a minor flood under your pc or in the worst water gets to the psu and it will die vilently and takes most of the pc componets with it.

Remove all dust filters, Set both rads as intake and remove the side panel. Give the radiators a good clean from dust. This will improve your situation to something a bit more manageble and secure

[OddOod]

35 minutes ago, MaratM said:

Get a temp sensor in your cooling loop

In fairness, I haven't actually temp'd my coolant. I'm making assumptions based on CPU and GPU temps
The CPU is not delidded.
Here is a shot of my temps under load

[Selle]

If your CPU maxes out at 84C and your GPU at 77, your liquid temperature is going to be way lower than 70C. If you let your CPU and GPU run under load until you reach your maximum temperatures and then stop the load, you can look at the GPU temperature, it should have a temperature only a few degrees higher than the liquid temperature at idle

[OddOod]

2 hours ago, Selle said:

your liquid temperature is going to be way lower than 70C

Oh duh! I forgot I have a thermapen and a reservoir  
My coolant under load is 64C

[Blai5e]

@OddOod 64°C is pretty damn high for coolant temperature. I have my machines (both using PMMA hardline tubing) set to max my fans out if coolant hits 45°C and shut down if the coolant ever gets to 60°C. Even on an overclock run, neither of my machine's coolant temperatures exceed 42°C (one had a 9900k & EVGA 3090 FTW3 Ultra w/500W BIOS and the other has a 12900k & ASUS 4090 TUF Gaming OC w/600W BIOS) each using 3 x 360mm radiators w/Corsair ML120 Elite fans.

 

If cranking up your fans doesn't do much, maybe your fans haven't got enough static pressure to overcome the radiator fin density.

[OddOod]

On 6/14/2024 at 3:24 PM, Blai5e said:

fans haven't got enough static pressure to overcome the radiator fin density

That is a solid possibility. They are BQ Silent wings I think. 
 

[TVwazhere]

On 5/15/2024 at 11:47 AM, OddOod said:

Thicc 280 rad w/ 2x fans @ 1200RPM (70%) intake > Normal 280 rad w/2 fans @ 1200 RPM (70%) 

1 hour ago, OddOod said:

That is a solid possibility. They are BQ Silent wings I think. 

BW Silwnt wings 3 make good case fans, but sub-par radiator fans. 

[OddOod]

17 hours ago, TVwazhere said:

BQ Silent Wings 3 make good case fans, but sub-par radiator fans. 

This is good to know. I suppose my question is "how boned am I if I change nothing?"
I know that a D5 in plastic is only rated for 60C so I'm probably burning life out of the pump and I'll likely have to replace that before the end of its expected service life, but aside from that, assuming I have overtemp safety shutdown set correctly, is there anything I need to be concerned about?

[TVwazhere]

22 hours ago, OddOod said:

This is good to know. I suppose my question is "how boned am I if I change nothing?"

Unsure; I'm not familiar with the lifespan of custom loop pumps, but I imagine it will fail a little sooner than one run under 60ºC. 

 

I'm curious, could you post a photo of your build?  Specifically capturing the fan placements.

[OddOod]

On 6/19/2024 at 7:44 AM, TVwazhere said:

will fail a little sooner than one run under 60ºC. 

Yeah, that's kinda fine. I went from hardline to 19mm zero maintenance which is apparently oversized for most everything
I have a photo of the rig in process. Intakes on the front, output on the roof

[OddOod]

Not that it matters, but loop order is pump > distro > cpu > gpu > front rad > top rad > distro pt. 2 > pump

[Stahlmann]

That's too hot. Pumps are typically designed for a max coolant temperature of around 60°C as per the spec sheets of both the D5 and DDC models commonly used in DIY liquid cooling.

 

My system ran with a max coolant temp of around 34°C under prolonged load, with only 800-1000 RPM on the fans and 1600 RPM on the pump at that temperature, going down to 20-25°C or so at idle. 5800X3D and 4080 are my specs. Granted, I have more radiator space with two 360 mm radiators, and my room temperature typically doesn't get over 25°C even in summer, but 65-70°X seems way too high imo. 

 

I found that slim rads that are specifically designed for low rpm fans have much less fin density. If you have thick or particularly dense rads you will need higher static pressure fans, higher RPM fans or a push pull config to get decent cooling out of them. With a <1000 RPM fan target, the Hardware Labs Nemesis radiator were a huge upgrade compared to the EK Quantum rads I had before. The EKs had much denser fins and were thicker. So if noise is your priority, you need low density slim radiators designed for slower fan speeds.

[Captain Matt]

I wouldn't immediately blame the fans. Static pressure is important.

But fin density is also a big factor in the equation!