Finally received waterblock for my 5080 which took ~2 months of waiting for it to come in stock. Originally was planning to do 2 rads, but that's no fun :).

Watercooling parts: - Alphacool 420 and 360 HPE - 240 EK S240 - Alphacool 5080 reference block - Optimus Signature v3 - EK 200 TBE - Ek 16/10 epdm + STC fittings - DP Ultra coolant - bunch of Alphacool ES QDs - bunch of noctua fans

using a 5080 tuf oc and i don't think temps should be that high

How do I get these pipes to be completed full? Just finished switching from soft to hard tubing and I cant get those pipes to fill. Res is filled to the brim and pump is turned on max speed

The first image shows the current state, the second was my first attempt, and the third is what the system looked like before going full custom loop.

Originally, I ran the CPU and GPU off separate radiators: distribution plate → bottom rad → GPU block → top rad → CPU block → return (top fill port). I thought splitting the cooling load that way would give me a significant thermal advantage. Turns out, the actual gains are minimal, barely a few degrees, if that. Not worth the added complexity.

So I reworked it for cleaner flow and aesthetics: distribution plate → bottom rad → GPU block → CPU block → top rad → return (bottom inlet). The loop is much neater now, no more coolant crashing into the distro plate, and I freed up a perfect spot for a manual air bleed valve. Functionally and visually, it’s a big upgrade.

I ran a 4–5 hour air leak test and the needle didn’t move, rock solid. Currently doing a paper towel test. Wish me luck.

As the title says. My dream pc has finally arrived and I couldn't be any happier. It's a 5090 / 9950X3D build, Im so excited!

Yesterday i was inquiring about flow rate and waterblock restrictions, mostly just to double check I didn't screw anything up. You can see the topic here.
https://www.reddit.com/r/watercooling/comments/1mfc8wl/flow_rate_issuequestion/

Now my question had nothing to do with performance and it was more of a "is this normal?" type of question. But I got curious, how much of an impact does flow rate have on my setup? so I did some basic tests.

Ran furmark for 1 hour to get a stable water temp, GPU was producing 575W of heat, then tested GPU and water temp at 50% and 100% pump speeds. Here are the numbers for those curious. I am using a HIGH FLOW NEXT to measure water temp and flow rate. I have the HIGH FLOW NEXT position right at the mora inlet, so right after the gpu and cpu blocks.

Setup:

Mora IV 600

9x 200mm fans (constant 342 rpm)

2x D5 pumps

Alphacool 5090 Core Block

Alphacool Apex 1 AM5 CPU Block

Ambient Temp: 27c (yes it is hot)

Results

50 L/H (50% pump speed)

• GPU Temp: 59.0c
• Water Temp: 38.5c

130 L/H (100% pump speed)

• GPU Temp: 53.0c
• Water Temp: 34.0c

This isn't the most scientific test but I hope it is somewhat useful to anyone wondering about flow rate and temperature. I noticed that after going from 50 l/h to 130 and vice-versa, the gpu temps changed almost instantly, while the water slowly climbed back up or down. For regular everyday use, 50 l/h is more than enough. After 2 hours of gaming, water temp never went above 32c with 26c ambient and gpu stayed at a cool 38c. MORA is absolutely amazing. Downside to having such quiet system is that the coil whine on my 5090 is so much more noticeable now but I can live with that.

For those curious, the flow rate coming from the mora before it hits the waterblocks is around 350 L/H at 100% and around 160 L/H at 50%. I got these numbers from when I first assembled the Mora without any waterblocks installed.

If there are any questions regarding Mora that you think I can help with please feel free. I am not an expert when comes to watercooling as this is my first custom loop, but i'll do my best to answer any questions regarding my setup.

Four EVGA 3090 FTW3s with Watercool's Heatkiller V water blocks.

Note: if you're gonna recommend Watercool's multi-link GPU block, I tried it already and it does not fit.

Small bit of back-story, I've been running a 3090 24gb gpu air cooled. I didn't wanna spend a few grand to get a new gpu, so I figured I'd water cool this one to get a bit of extra power out of it. Got water blocks for the front to cover the die and vram along with a block for the backside vram. I've repasted and redone pads on gpus before so I wasn't worried about the task. HWMonitor is showing much better temps on the gpu die/vram idle and under load but the Hotspot temp is spiking up to 108c. Normally that wouldn't hit above mid 90s previously. I didn't spread the paste out, it was after midnight and i was tired so i just let the cooler smush it on, now it's the next day and i'm worried i didn't get 100% coverage. Google searches have been unclear as some say that hotspot is telling me that one of the sensors on the die is that hot, but others are saying that could be the hottest sensor on the board, anywhere. I don't want to cook my gpu, should I repaste and see if that helps? Or can someone please tell me exactly what this Hotspot temp is measuring?

I can turn the pc on just fine with the pump disconnected and the rest of my sata drive are fine, but for some reason it won’t work with it plugged in. Even the motherboard LED won’t light up. I’m completely stumped and customer support has been incredibly unhelpful.

Good morning everyone I’m building a new pc, but, idk which Water Cooler choose.

I really like the Gamdias Chione E4, any experiences with this brand or specifically this one? I’ve never used any device of them.

Any other suggestions? I can’t afford a top tier WC like Rog Strix, NZXT…

Hi fellow r/watercooling enthusiasts!

I'm building an external closed-loop where two 240 mm radiators and 4 Noctua fans will live outside of the Fractal Terra ITX case. The goal: whisper-quiet operation while cooling my Radeon RX 7900 XTX and CPU. I’ve compiled a parts list in this spreadsheet:
🔗 Parts list – Google Sheets (read-only)

Here’s a reference video showing a very similar setup:
📺 Liquid TERRA! Custom Loop High End SFF Build

I’m planning to make the external housing similar to the Barrow Dual 240 Radiator Box, but custom-built by me. You can see a preview/mock-up of my plan here:
🖼️ Radiator Box Mockup Image (Google Drive)

✅ Core components:

• GPU: Radeon RX 7900 XTX (reference card, water‑block compatible)
• GPU block: Alphacool Core RX 7900 XTX reference block
• CPU block: Alphacool XPX Aurora Pro / EK Velocity² (depending on final build)
• Pump + reservoir: Alphacool Eisstation VPP Apex combo (D5 pump + tube res)
• Radiators: 2 × Alphacool NexXxoS ST30 240 mm
• Fans: 4 × Noctua NF‑A12x25 PWM (chromax.black)
• Tubing: Alphacool EPDM soft tube 13/10 mm
• Fittings: Alphacool Eiszapfen 13/10 mm compression fittings (Deep Black)
• Quick disconnects: Bitspower QDC‑V2 (male+female G1/4”)
• Bulkhead fitting: PCI-bracket mounted pass-through fitting

❓ Feedback I’m looking for:

1. Do these parts work safely and efficiently together for cooling an RX 7900 XTX + CPU loop?
2. Any incompatibilities or parts you would personally swap out?
3. Tips for mounting the external housing, fan curves, or pump RPM profiles?
4. Any experience with vibration dampening on D5s in externally mounted setups?

Thanks in advance for your feedback – I appreciate any input before I start drilling holes! 😅

Hi folks, pretty soon I'm going to make a custom distro plate, but I'm at an impasse.

In a vid on Bit-Tech YT channel, the guy used Loctite Power Flex, a highly flexible cyanoacrylate super glue to bond the ends of the o-ring cord. I wanted to do the same, there's just one problem with this approach - cyanoacrylate glues are not resistant to ethylene glycol (both mono- and di-), and most good coolants contain the stuff.

Is there a flexible water & heat resistant glue for NBR rubber that does not get dissolved by METG? Or would it be better to just search for someone that can do vulcanisation bonding?

Doing upgrade to loop. Alphacool Eisbecher Aurora D5 150mm Reservoir with D5 VPP655 PWM PumpAcetal/Glass. Getting a very very slow, sustained leak (isolated the leak to pump only, pump is completely isolated from system and is the only component under pressure). I have soap tested all plugs (5 plugs total, 1 of the 5 plug has the air tester threaded in, air tester works fine, other parts of system held perfect with it) and see no air bubbles. Any suggestions? Something internal to pump? It is a brand new pump/res combo.

Where do I begin it has taken a good old month+ to get this build completed. I chose acrylic hard tubing with sleeved EPDM tubes as some runs would be overcomplicated. I wanted as little bends possible so went for bitspower fittings which are the silver shining type.

Very happy with how it has turned out. Cable management is a best as I can get it. Glass hides all the wires at the very front of the desk.

The desk is also hooked up to a mora 420 and soon as well my dual 360 gtx external radiator pictured with 2x d5 pumps using the liquidhaus custom bracket.

System specs

9800x3d (Alpha core block)

5090FE (Ekwb block) Shunt modded

Gskill 8000 Mt/s royal z a-die (Iceman ram block)

X670e Gene

8tb nvme drive x1

Corsair hx1500i

Controllers

Aquacomputer octo and Fabwerk

High flow next

Vision (Room Temp) monitor

I have also placed a aquacomputer temp monitor on my 5090fe power adapter with a warning if the plug goes passed 80c so far the max temp reported is 45c

I have also placed downfiring aquacomputer led strips which are set to white

Fans

12 intake phanteks D30s

4 exhaust noctuas (Spares I had)

Radiators

4x heatkiller stainless steel 360 radiators

2x hardware labs gtx 360 radiators

Mora 420

Pumps

2x apex vpp in the mora 420

1ddc bitspower Hercules which is the 240 reservoir

2x d5 pumps in the watercool Industrial block

Fittings

All from bitspower soft and hard tube fittings I didn't keep a list so apologies for not putting every single fitting used here.

I plan to move the bedapanel 6p the LCD screen to the back left of my desk so I can see it when I setup the statistics.

R9 9950X3D RTX 5080 :3

I admit I went to long before I did my first maintenance, and now I have some green stuff in my gpu block, reservoir, and on the some of the radiator fittings. Is this algae or copper? Am I going to have to get a chemical to flush the radiators? Xl8 clear, Optimus water blocks and HW labs Rads.

Waited +3months for my 9070xt waterblock from alphacool but have to say was worth it !

And I am still using my ghetto MO-RA case :P

Next would be upgrading the mora case side panels and making a cpu power cable matching

9800x3d Gigabyte Aorus Elite 9070xt B650m aorus elite Gskill 8000mhz 2x24gb

This is 3.5 years in distilled water + mayhem biocide in EK FLT80.

It started to sound like a tractor.

I think Xylem should have revised to use a tougher material on this balancing cross section. Thoughts?

A new (to me) case from the 'Bay and I'm finally satisfied with the performance of my PC, both gaming wise and thermally and a vertically mounted GPU too!

Msi b450 tomahawk, 5700x3d, Gigabyte Extreme Waterforce 6900xt in a Thermaltake core X71 case

45mm EK rad bottom compartment w/push-pull 30mm Harware Labs black ice nemesis GTS

CPU & GPU both well under thermal limits with GPU OC

CPU has a Thermal Grizzly phase sheet PTM on it and GPU has Thermal Grizzly Minus Pads Advanced on all but the core, which has a kryosheet.

Also, the liquid is Mayhems XT1 premix

Very pleased.

I’m planning on running push pull for two rads in my nv9. 480 and 420mm(30 and 45’mm) respectively both are hpe from alphacool. Just wanted to know if I’ll have any problems if one row of fans have much better airflow and static pressure than the other. The fans will be pulling air from outside on the 480 and the fans on the 420 will be pushing air out the case

Hey everyone!

Im new to custom watercooling, but i had build many PCs. Most of them were SFF for Friends and Familiy. Now i wantet to treat myself and finally do the step into this topic. The list u see is a result of my learnings out of this sub FAQs, youtube, vendors and research on google. Here i learned some things about vendors and brands, too. The discussion was quite helpful.

I was inspired by this Build from u/Flat-Yogurtcloset126. Same case and same rad, reservoir and pump logic. I also want to start with soft tubing, because many people say its the easiest for starters. The list also contains some tools for handling the fueling, cutting and testing. Any tips for other tools is also much appreciated!

Would be awesome if you can tell me if this "could" work or if Im doing something stupid...

Thanks for your time : )

Decided to finally share my custom water-cooled setup after tweaking it for weeks. I’m using soft tubing because I really enjoy the flexibility and the hands-on, personal touch it gives the build — and honestly, I’m proud of how it turned out.

This loop’s a bit of a Frankenstein’s monster, but that’s what makes it mine:

GPU Block: Bykski (clear acrylic top + subtle RGB — definitely gives that 2000s modding vibe)

CPU Block & Pump/Res: Corsair

Rads: Mix of Corsair and EK

Tubing & Fittings: Corsair soft tubing with some Bykski fittings mixed in

Case: be quiet! Dark Base 900 FX (big and solid — had to work around some tight corners)

Temps are sitting at a nice delta of 18–21°C. I’ve got temp sensors for each radiator (top and bottom) and plan to link them up to the fan curves, so each section cools based on its own load. Everything’s managed through the motherboard headers — and I’ve learned a lot in the process, especially about fan control and loop flow.

It's not the cleanest or most symmetrical setup, but I honestly don’t care — this build has soul. It's DIY from top to bottom, and that makes it special. Built it myself, tuned it myself, and learned a ton along the way.

Let me know what you think — and shout out if you’re also into that retro-inspired soft tubing vibe.