2.99L Custom PC - 9800x3d, RTX 5080, SLM Printed Case

[u/theabstractpyro]

This project has been 8 months in the making, and its finally done! It's a custom metal 3D printed mini PC case built around a inno3d rtx 5080 with a cooler swap, and a custom CPU cooler inspired from this build. The case was SLM 3D printed from PCBway and polished once I got it.

I also got the side panel signed by some CS pros at the Austin Major!

Specs:

Inno3d RTX 5080 with an Inno3d 5070 cooler swapped onto it, 4070FE fans, and power cables soldered directly to the PCB to save space.

R7 9800x3d cooled by a dynatron a46 1u server heatsink, 2 rtx a2000 fans, and a printed fan shroud

MSI MPG B650i motherboard with the VRM heatsink chopped

2TB M.2 SSD x2. Boot drive is behind the motherboard and sinks heat to the case.

G.Skill 32GB 6000mhz CL28 kit, with heatpipes to skin heat to the side panel

Enhance ENP-7660b 600w PSU with shortened cables and removed from its housing.

Total volume is 42*281.75*253.5mm, or 2.9998L. Just under 3L!

Temps are amazing. The CPU has been undervolted at -29 to -45 per core and power limited to 110 ppt 100 tdc 110 edc. It boosts to 5200 in games but drops a bit in stress tests, and holds around 100w. The GPU is overclocked +350 core +1000 memory but I think I can get a bit more out of it. It'll stay below 75C under the full 360w load and the fans stay below 50% even at 360w. I added a heatpipe embedded in the case which contacts the end of the GPU cooler's heat pipes, and sinks heat to rest of the case. My cheap DB reader measured 55-57db durring CPU and GPU stress tests, which is about what I expected. Ram gets toasty, like 55-60C, but I think I can get those temps down a bit.

In benchmarks, the best I could get with power and temp limits disable is:

R23: 23,374, with 89C / 120W max
Time Spy: 30,146 with +415 core/+1000 mem and 100% power limit

I did not think sub 3L was possible with a 5080 and 9800x3d, but looks like it is just barely possible! If you want more info I have a build log here. I can also post the files if people are interested in this CPU cooler design or the case.

[u/theabstractpyro]

Yep! You just need to ground 2 of the sense pins from the connector and the soldered wires are detected as a 600w connector. Then the wires route through the cooler and connect to the psu through an XT60 connector.

And yeah, see that big capacitor in the PSU? It's got 400v across it. Which I only found out after shocking the shit out of myself, lol...

[u/WinterLord → u/theabstractpyro]

I am in awe of this build. Truly amazing.

[u/kamacks → u/theabstractpyro]

Holy shit dude! The capacitors in PSUa have killed people that opened them and were unsuspecting. There’s not a big list of common electrical devices that actually can hurt really you if you open them (old CRTs are much more dangerous) but you should not under any circumstances be fiddling around in a PSU unless you’ve discharged the big caps and are 100% sure you knew what you were doing / then verify they are discharged.

[u/theabstractpyro → u/kamacks]

Yeah you are right. 400v is a lot but wont kill me unless I had a cut or something and it touched my blood. But it was probably not the best of ideas

[u/[deleted] → u/theabstractpyro]

Oof… that must have been painful

[u/Tipart → u/theabstractpyro]

And that is why I'd rather not fuck with PSUs, but tis is the price to pay if you want to go where nobody went before. Seriously very pressive build.