[rmah]

Their competition is the enterprise hardware divisions of HP, Dell, and IBM. SuperMicro makes reasonably good quality, lower-cost server equipment. They are, IMO, a pretty good value if you don't want high-end support from the hardware vendor.

[0xcde4c3db]

ASRock has also pushed into some of Supermicro's traditional product segments via the "ASRock Rack" brand. I have no idea how big that business is, though.

[jauntywundrkind]

Gigabyte and Zotac also comes to mind, resemble Asrock.

There's a bunch of other kit too, but https://servethehome.com reviews a bunch of the various rack systems.

Example of some late January posts. Albeit none are of the "fits lots of GPU" sort that is helping propel Supermicro, but these folks all have those offerings too,

Supermicro SYS-511R-M Intel Xeon E-2488 1U Server Review https://www.servethehome.com/supermicro-sys-511r-m-intel-xeo...

Gigabyte R183-Z95 Review Dual AMD EPYC Server with a EDSFF Twist https://www.servethehome.com/gigabyte-r183-z95-review-dual-a...

ASRock Rack ALTRAD8UD-1L2T Review This is the Ampere Arm Motherboard You... https://www.servethehome.com/asrock-rack-altrad8ud-1l2t-revi...

[kbar13]

nowhere near as prevalent as supermicro still. asrock rack does make some decent stuff tho so i would imagine theres a good future there

[1letterunixname]

HPE, Dell, and IBM are glorified CDW-business model salespeople. Megacorps have no use for that when they can engage the source and get their own custom gear.

https://en.wikipedia.org/wiki/Quanta_Computer