I have an HL15 and inbound hardware Supermicro H13SSL-NT and EPYC 9354P with an upgrade path to 9575F. What about cooling ??
Arctic Freezer 4U-SP5 ? I watched a video of this not fitting in a general 4U chassis (but not HL15)
SilverStone XE360-SP5 ? Anybody put an AIO in this chassis ?
Anybody running an SP5 in an HL 15 ?
Quite frankly, if you need to run 400W of compute and an array of 15 spinning disks and keep noise bearable, the HL-15 may not be for you. You might be better to move the storage to a separate box with a high speed NIC or external SAS connection and use a box for compute that can accommodate an AIO. Or consider changing to an HL15 Beast, which would give you beefier tower cooler options.
The Arctic Freezer 4U-SP5 should fit fine in the HL15 but it’s maximum TDP is 360W. If you aren’t going to be pushing the 9575F to the limit, or can deal with a bit of thermal throttling, then using it may be your best 4U option.
There is also the SilverStone XE04-SP5 which is rated for 400W and will fit in the HL15, but the fans are smaller and can ramp up to 5000 RPM, so it will sound more like a server fan.
You can try a DIY mod to the mid-chassis fan wall to install an AIO, but the case just isn’t really designed for that. You’re either going to be exhausting hot air onto the drives, or bringing already hot air from the drives into the motherboard chamber.
Thank you. I’m worried the Arctice Freeze won’t fit based on an old video in an old inwin case (https://youtu.be/v0jZ12U3u4A?si=gF6PovTBlnah_Mdp). But I will pull the trigger on that and let everyone know. The HL15 is the most expensive Chassis I every purchased and it’s been sitting here for 6 months - I don’t want to have to recoup those funds to jump on the beast 
Just get the cooler from Amazon or somewhere you can return it without a fuss. If I’m incorrect, i apologize. The numbers seem to suggest it should fit. The difference may be that because other cases are built from thinner metal, they need to double-up in the motherboard area with a structural plate. The HL15 Doesn’t need this.
For those interested - the Arctic Feezer 4U-SP5 fits fine. the configuration is a lot different than the noctua cooler you see in a lot of HL15 builds online and really leaves a lot less room in the back of the case and the way folks are mounting SSD’s in the bracket back there wont work. But the clearance is GOOD to the top of the case.
Note the mighty fine zip tie installation method of replacement Noctuas on the arctic
I absolutely agree the comments above. The short depth doe not make the HL15 a good candidate for high-end compute and storage.
I recently built a new EPYC system to combine three separate systems into one compute platform. with two Intel B60 Pro GPUs and couple extra SSDs the HL15 and it is just way to crammed for space.
I made the decision to separate compute and storage as I had to remove the inner fan panel which really impacted airflow and temps unless I cranked the fans up.
The HL15 can work well for combined compute/storage setups, but there are hardware tradeoffs that have to be made.
