I've been looking for and testing some mini-PCs to replace a couple of aging i7/64GB Mac Mini units.... Initially bought the Geekom IT13 (got through 4 of them I think...) and it was a disaster.
1. After a week or so just wouldn't turn on, return and replaced.
2. Replacement from Geekcom .... lasted about 2 weeks before it turned off and wouldn't turn on again.
3. Second unit I bought from Amazon...They delivered an IT12 instead of an IT3...so returned.
4. Amazon unit also failed.
5. Geekom said they think there was a problem with 'a batch' of them, so I Amex'd my money back. Meh.
Anyway, ended up with one of these - a MinisForum MS-01. It's bigger than the Geekom but then its a far better unit (even if the Geekom worked...). Supports DDR5 (the Geekom only DDR4) and has 3 NVMe slots (one of them U2 supporting). In addition it has
TWO 10Gbe SFP+ ports, 2 x 2.5Gb ports, 2x TB4 ports and some USB on the front/ back. Yes, I had accidentaly pulled out the SFP+ to RJ45 converter when taking that crappy picture. So far it's been brilliant - it's been on and solid now since I got it a few weeks ago, so suspect I'll have another one incoming shortly.
Spec I've ended up with with is
96GB RAM (2x48GB), 4TB+1TB+1TB NVMe (had a couple of 1TB drives kicking about so put them in because why not), 10Gbe and 2.5Gb connected (main network and HyperV network). Very impressed.