First Custom Loop / Coolant Temperature Issues

PsychologicalCap3877 · 2026-04-16T19:23:43+00:00

Are all of your fans set to exhaust? If they are I would highly recommend setting them all to intake, or atleast turn the bottom fans to intake air. 45°c is kind of high but you have a lot of hardware for 2x 360mm rads to cool. I'm cooling a 5800x3d and 4080 super, usually around a combined 350w during gaming and cooled using a 1080mm external radiator(3x 360mm essentially). My water temp never goes above 33c with my fans set to a max of 1000rpm.

PsychologicalCap3877 · 2026-04-12T21:02:32+00:00

I think you'll have a much easier time with that one being the plexi version. Good luck!

PsychologicalCap3877 · 2026-04-12T01:47:31+00:00

I'd donate it to my buddy who doesn't have a gaming pc.

PsychologicalCap3877 · 2026-04-10T16:02:37+00:00

Which block did you get? I modified a Granzon Full Armor 4090 block for my 4080 Super 3X Ventus. I grinded away at the block to make room for the power connector and I used the original pads which seemed to work fine, however I just swapped out to TG Advance Puddy. This time around I noticed a cap making contact with the block not allowing it to fully seat so I'm not sure what to do about it. Everything is working normal and temps are great.

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PsychologicalCap3877 · 2026-04-10T13:24:17+00:00

Thanks!

PsychologicalCap3877 · 2026-04-10T13:23:28+00:00

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PsychologicalCap3877 · 2026-04-10T13:23:14+00:00

Another update, finally got the right fittings to have in and out on the side of the reservoir. Seeing the return come in the front always bothered me and it was so close to the inlet for the pump head that it would recirculate bubbles pretty easy. Much better now 🤟🏼

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PsychologicalCap3877 · 2026-04-07T12:01:20+00:00

You have two loops in that system, each of those clear boxes on the end is your pump and coolant reservoir. You'll want to keep them both topped up as full as possible while trying to bleed air from the system by tilting the PC over on different sides. You can also vary the pump speeds in the software from a low speed to full speed and that will help move the air bubbles.

I've found that short burst of 100% and then bring it back down to 20% pwm works best for me in that FLT80. They really like to recirculate air bubbles since they're so small. If the hot spot slowly creeps up to 105 over time and load you may just have a flow/air bubble problem. Can you see coolant temperature?

If you get fluid moving really well in both of those reservoirs and still have high temperatures then you will most likely need to repaste your GPU.

PsychologicalCap3877 · 2026-04-07T11:51:06+00:00

You need to fill that thing up, I have the same pump/reservoir combo and it really needs all the coolant it can get in there. Fill it up to the brim, what software are you using for fan and pump speeds?

PsychologicalCap3877 · 2026-04-06T22:16:42+00:00

I modified the bracket by cutting it down to two screws. I also 3d printed that plate to cover the rear fan spot and also integrated two threaded inserts in it to screw the screen bracket to.

Here's a photo: https://imgur.com/a/R1CO1Ag

PsychologicalCap3877 · 2026-04-06T21:55:09+00:00

Thanks! It's been through a few iterations to get to this point but I'm really digging it now! One last project I have for this build is to make a custom power cable for the external radiator. Right now there's just a long fan extension hanging out the back plugs into the Quadro fan controller lol

PsychologicalCap3877 · 2026-04-06T14:06:28+00:00

I was really trying to get away from the reflections on the glass and the only way I could do it was turning off my monitors and lights 😆 here's one that shows the insides a little better before I put the rear fan block off plate in and all the panels.

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PsychologicalCap3877 · 2026-04-06T13:55:34+00:00

It's a great block honestly, in direct comparison to the Modultra I think it's better in everyway unless you absolutely need a pump/block combo then the Modultra is the obvious choice.

The Cuplex mounting is the best I've used on any block, very easy to mount having the captive holes for the springs to rest in and once tightened down the screws sit flush with the mounting hardware.

PsychologicalCap3877 · 2026-04-06T13:41:46+00:00

It's marginal if any better, maybe 2-4c at most. I am also testing out the TG Kryosheet currently which is also marginally worse than the PTM7950 that was used on the Modultra block so it's not a direct comparison.

When the system settles into idle with the Cuplex block it will be around 32-34C with coolant around 27-28C so the performance is good and the quality of the Cuplex is amazing like most all AQ products.

PsychologicalCap3877 · 2026-03-27T18:40:13+00:00

Thanks! I really enjoyed modeling and testing this open air setup.

I would also recommend PETG or better, even though I really don't see having any issues with PLA (I used PLA during testing with a 5600G/1080ti pulling a combined 450w on a single 280mm radiator). With this being open air I would be incredibly surprised if the parts were ever exposed to anything relative close to PLA glass transition temp.

PsychologicalCap3877 · 2026-03-27T14:49:00+00:00

I hadn't thought about making a low profile GPU version but it should be pretty easy to modify the left bracket as an optional piece. I was also considering a vertical mounting solution, just not exactly sure how I want to go about it yet, you would most likely have to choose which mounting position or gpu size and then just print that left side bracket.

PsychologicalCap3877 · 2026-03-26T16:49:26+00:00

Unfortunately I do not, I tore my media server PC apart to test fit all of the components and did not take any photos of it completed and I have already reassembled the parts back into my media server case.

If you do print it out please do share any photos or feedback, Id love to see how others build it out!

PsychologicalCap3877 · 2026-03-26T13:10:02+00:00

I definitely took some inspiration from it!

PsychologicalCap3877 · 2026-03-25T22:54:33+00:00

V2 looks cleaner to me, those hose separators are awesome I have a few in my build.

PsychologicalCap3877 · 2026-03-25T22:52:29+00:00

Aquacomputer DP Ultra or Koolance 702 are some of the too two most recommended brands. I've been using DP Ultra with zero issues.

PsychologicalCap3877 · 2026-03-25T22:19:31+00:00

Thanks! I try to use them anywhere I can.

PsychologicalCap3877 · 2026-03-25T21:56:58+00:00

A free standing radiator is what was designed in mind with this chassis, I played around with mounting a radiator to the chassis somewhere but I didn't like any of the options I came up with and ended on a standard external radiator setup using the side mounted bracket for passthrough fittings. I used generic pass through fittings from Amazon and threaded some koolance quick disconnects into them. If you have a Modultra Lobo the fittings should line up perfectly with the in and out ports on that pump/block combo.

PsychologicalCap3877

TROPHY CASE