General Knoppix support for those who've read the FAQ at the Wiki
Dell Precision 5820 XEON W-2102 2.9GHz 16GB 256GB (x3) Quadro P5000 Workstation
$272.79
INTEL XEON GOLD 6242 2.8 GHZ PROCESSOR | SRF8Y
$499.99
Dell Precision 5810 Workstation Xeon E5-1650 6C 3.5GHz 16GB 500GB Win10 K2200
$124.67
Matched Pair __ Intel Xeon Gold 6152 2.1Ghz 22-Core 140W CPU SR3B4
$214.95
Intel Xeon E5-2697 V4 2.30 GHz 18C 2011-3 2400MHz 45MB 145W SR2JV CPU Processor
$49.99
Intel Xeon Gold 6140 SR3AX 2.3GHz 18-Core Processor CPU
$39.99
SR1XD INTEL XEON 18 CORE PROCESSOR E5-2699V3 2.30GHZ 45M 145W CM8064401739300
$44.90
SR1XP Intel Xeon E5-2680 v3 12 Core 30MB 2.5GHz LGA 2011-3 A Grade Processor
$5.27
SRF8T INTEL XEON GOLD 5218 2.30GHZ 16-CORE 22MB 125W CPU PROCESSOR
$297.00
HP Z440 Workstation 18 Core E5-2699 V3 128GB RAM 512GB SSD 2TB WiFi WIN10 DVD
$309.99