General Knoppix support for those who've read the FAQ at the Wiki
HP Z420 Workstation Xeon E5-2690 v2 3ghz 10-Cores 64gb 512gb SSD 4TB Win10
$239.99
Intel Xeon E5-2697 V4 2.30 GHz 18C 2011-3 2400MHz 45MB 145W SR2JV CPU Processor
$45.00
Dell Precision T5600 Xeon E5-2603 1.80GHz 16GB RAM 1TB HDD Quadro 600 #27
$76.99
Lenovo Thinkstation P510 E5-1620 V4 16GB RAM 512GB SSD DVD Quadro M2000 W10 Pro
$184.95
Intel Xeon E5-2680 v4 SR2N7 2.40GHz 35MB 14-Core LGA2011-3 CPU Processor
$14.99
SR1XP Intel Xeon E5-2680 v3 12 Core 30MB 2.5GHz LGA 2011-3 Grade A Processor
$4.05
Intel Xeon E5-2697A V4 2.6GHz CPU Processor 16-Core Socket LGA2011 SR2K1
$37.99
Intel Xeon E7-8890 V4 2.20GHz 24-Core 60MB LGA2011 Server CPU Processor SR2SS
$29.99
Intel Xeon E3-1285 V3 3.6 GHz 8M Quad-Core SR14W CPU Processor
$49.50
Dell Precision T7820 Tower 2x Intel Xeon Gold 6130No RAM/ GPU/ HDD/ OS
$454.97