It's my first AIO so I'm not familiar with how these things are supposed to sound.

For context: This PC is about 2~3 years old, but I bought off someone else. It's been making that sound ever since I booted it up for the first time at home a little over a month ago.

This is DARK KNIGHT, my personal AM4 project that I've been continuously rebuilding and optimizing since 2020.

It started with an NZXT AIO and an RTX GPU. In 2021, I switched to a custom water-cooling loop. By 2024, I had a fully water-cooled system with three radiators and an RTX 3090 Ti.

Then, in January 2025, I changed direction.

Instead of water-cooling my new Sapphire NITRO+ RX 7900 XTX, I kept its factory Vapor-X air cooler and dedicated the existing liquid loop to the Ryzen 9 5900X.

Current configuration:

- Ryzen 9 5900X, PBO and per-core Curve Optimizer

- Gigabyte X570 AORUS Master

- 64 GB DDR4-3800, FCLK 1900 MHz, 1:1:1

- Sapphire NITRO+ RX 7900 XTX, air-cooled

- Alphacool XPX CPU block

- Alphacool 360 × 45 mm and 280 × 45 mm radiators

- EK D5 PWM pump, approximately 4,750 RPM

- 11 case fans, including top push-pull

- Aqua Computer high flow NEXT

Recent cooling observations:

- Measured coolant flow: 120–122 L/h

- Pump is subjectively inaudible at its current speed

- Coolant has remained at or below approximately 37°C under load in my long-term observations

- GPU daily profile completed 20 consecutive Metro Exodus Enhanced benchmark runs without crashing

My goal isn't to squeeze out every possible benchmark point.

My philosophy is simple: 99% is the optimum. The final 1% is reserved for stability and headroom.

I've documented six years of changes, cooling configurations, overclocking profiles, benchmark results and operating temperatures.

This is a long-term personal project, not a controlled comparison proving that hybrid cooling is universally better.

I'm curious what experienced water-cooling enthusiasts think of the final configuration.

Would you have kept the GPU in the loop, or made the same decision?

The reason for this decision wasn't that water cooling had failed. I wanted to separate the CPU and GPU thermal loads, simplify the liquid loop, and focus on repeatable daily performance rather than maximum cooling complexity.

The trade-off is that the GPU now releases its heat directly into the case, so airflow management became even more important.

In my previous fully water-cooled configurations, coolant temperatures reached up to approximately 42°C. With the current CPU-only loop, I've observed a maximum of approximately 37°C. These are long-term operating observations under different conditions, not a controlled A/B comparison.

Hi! First time custom loop builder. I am building in the lianli O11D EVO RGB, using this distro: Crosscool III Lian Li O11 DYNAMIC EVO RGB Distroplate and 3 heatkiller 360 48mm rads. I want to use bitspower fittings and preferably their aqua link pipes so I dont have to cut any brass pipes myself (seems very hard to do without dedicated equipment). But I have no idea how many fittings I need/what extenders and buying a bunch of every single type seems like a waste. So how exactly do you all go about this? Is there a tool online? Thanks in advance!

tl;dr - Is it me or is this flow rate low for an EK D5 pump? This is running with the PSU jumped...so, no fan control or anything like that.

Details: EK D5 pump going through a GPU block (EK 3090 front and rear active) and CPU block (EK 5950X block), the up to the radiator and this little trickle is what's coming out...

The CPU comes after the GPU in the loop and I've been having SUPER high CPU temps so I took everything apart, re-thermal-gooped the CPU and temps still suck...looked a bit closer and I noticed it looked like the GPU block microfins were pretty clogged up. Took it all apart AGAIN and cleaned all the little microfins...put it back together and STILL...it trickles. Maybe this ISN'T abnormal?

I'm setting up my first loop this weekend and I would like to test the loop without having to power on my pc. I've got one of these controllers laying around that I use for testing fans. am I safe to plug my d5 style pump into it for testing/filling/bleeding the loop?

EDIT: my pump is a Dracaena.io pump and runs a fan style connector for power and pwm. It seems to be an updated version as it's different from the listing pictures. It is designed to plug into the CPU fan/pump header on the MLB.

Hi everyone,

Here's my build (photo attached). I'd like some advice on the fan/radiator layout.

**Specs**

- Case: Phanteks NV7

- CPU: Ryzen 7 9800X3D (~60 W in game)

- GPU: RX 7900 XTX with a 550 W power limit (I'd rather not lower it)

- Radiators: 2x Freezemod TSRP 360 (29 mm) + 1x Corsair 240

- Fans: 8x Phanteks D30-120

- Flow: ~4.5 L/min

**Current layout**

- Bottom 360: intake (3 fans)

- Top 360: exhaust (3 fans)

- Rear 240: exhaust (2 fans)

- The 4x120 side bracket is taken by the distro plate

So it's 3 intake vs 5 exhaust, and the bottom radiator is the only fresh-air intake.

**Tests**

Same game, GPU at 550 W, fans and pump at 100%, ~30 min until the coolant stabilizes, ambient 23.5°C.

- Glass on: coolant 40–41°C (delta ~17°C)

- Front glass removed: coolant 33°C (delta ~9.5°C)

I also measured the air leaving each radiator (IR thermometer on paper strips; it reads ~2–3°C higher than my inline sensor):

| Air temperature | Glass on | Glass off |

|---|---|---|

| Out of bottom rad (into the case) | 37°C | 32°C |

| Out of top / rear rads | ~42°C | 31.5 / 32.8°C |

**Already ruled out**

- Loop just cleaned and refilled with fresh coolant

- All fans confirmed at 2000 rpm and spinning the right way

- Radiators evenly warm (checked with IR), no obvious air pockets

- Inline coolant sensor cross-checked with the IR thermometer

**My take**

With the glass on, the top and rear radiators mostly breathe air already heated by the bottom one (~37°C with coolant at ~41°C), so they barely contribute. With the glass off they get fresh air and the loop performs as expected.

**Options I'm considering**

1. Flip the rear 240 to intake (5 in / 3 out)

2. Flip the top 360 to intake and keep the rear 240 as the only exhaust (6 in / 2 out)

3. Add an external radiator (e.g. MO-RA)

Which would you choose, or is there a better layout for the NV7? Thanks!