General Knoppix support for those who've read the FAQ at the Wiki
Lenovo ThinkStation P920 2x Xeon Gold 6128 3.40GHZ 128GB DDR4 RAM No HDD TESTED
$504.95
Dell Poweredge R730xd LFF 14-Bay 2U Server | Choose Your CPU & RAM Config
$454.99
Matched pair Intel Xeon E5-2667v4 SR2P5 3.20GHz, 8 core, 25MB Processors LGA2011
$62.95
HP Z6 G4 Workstation Xeon Silver 4116 1.5TB SSD 1TB HDD 16GB B Win 11 Pro M4000
$349.00
Intel Xeon E5-2680 V4 CPU 2.4~3.3GHz 14-Core 35M LGA 2011-3 R3 Server SR2N7 120W
$15.99
Intel Xeon E5-2680 V3 2.50Ghz 12 Core 30MB Cache LGA 2011-3 CPU SR1XP Tested
$5.90
INTEL Xeon E5-2697 V4 SR2JV 2.30GHZ 18-Core CPU 2697v4 GRADE A CONDITION @ E
$39.00
Intel Xeon Gold 6138 2.0GHz 27.5MB 20-Core 125W LGA3647 SR3B5
$37.00
HP Z440 Workstation 18Cores Xeon E5-2699 V3 128GB 1TB SSD 2TB WIFI WIN11 R5-340X
$309.99
HP Z2 Mini G3 Workstation Intel Xeon E3-1245 v6 3.70Ghz 32GB RAM No SSD No Hdd
$174.00