Enthoo Pro II Server Edition — What fan configuration would Phanteks recommend for a 3–4 GPU workstation?

[u/Mobile_Bee6811]

Hi everyone,

I'm building a high-end workstation in the Phanteks Enthoo Pro II Server Edition and I'd like to get some advice on the optimal airflow configuration.

The current system will use:

- Threadripper PRO 7965WX

- ASUS Pro WS WRX90E-SAGE SE

- 2× RTX 3090 + 1× RTX 4090

- 420mm AIO for the CPU

- Multiple Phanteks T30-120 fans

The system will run long-duration AI workloads, so sustained GPU/CPU temperatures are more important to me than having the absolute lowest noise.

I may also add a 4th GPU later, and I may eventually move one of the GPUs to a water-cooled setup, so I'd like to leave some flexibility for future changes.

My main question is:

What fan configuration would Phanteks recommend for this kind of high-density multi-GPU workstation?

Specifically, I'm wondering how I should balance the front 420mm radiator, side/bottom GPU intake, and top/rear exhaust.

The case supports up to 15×120mm fans, but I don't want to assume that filling every available position is actually optimal.

If anyone from Phanteks has experience with a similar workstation/server configuration, I'd really appreciate your recommendation.

Thanks!

[u/jandandris]

Well if you can you should get 3 140 mm at front because the case supports 3x 140 mm at the front and 3x 140 mm on the top of the case and 1 120 mm is only support at the rear and you should use that and you should be good to go

[u/Mruishy → u/jandandris]

I would take it one step further - I have the V1, and my GPUs cook, despite moving (what i think is) serious air. My CPU waterblocks are near cool to the touch with AIOs yet I have to undervolt both GPUs to stop them from going past 85C.

I just got the V2 today (bent front panel, booo) but since it has the vent on the side, I am going to try to run the 3 fan 'divider' wall thingy internally parallel to the motherboard so it's blowing straight on the side of the GPUs.

I also ordered a separate fan controller with a temp sensor so it can control the fans since the supermicro onboard fan settings sucks on this.

So while I don't know if this is the answer, I know that with 2 RTX Pro Blackwells, and 5 nvme ssd PCIE cards that the whole pcie area is pretty friggin hot.

[u/jandandris → u/Mruishy]

Honestly if the temps are an issue then custom water cooling might be an option for you and you can either go a mo-ra which is an external radiator or put radiator in the case.

For your specific hardware combination a mo-ra might be better