General Knoppix support for those who've read the FAQ at the Wiki
Dell Precision 5820 Intel Xeon W-2102 64GB RAM 120GB SSD + 2TB HDD Quadro M2000
$319.99
HP Z420 Workstation Xeon E5-2670 v2 2.5ghz 10-Cores 64gb 240gb SSD 1TB Win10
$199.99
HP Z840 Workstation Intel Xeon E5-2637v3 3.5GHz 32GB RAM 512GB SSD W10P Nvidia
$225.00
Dell Precision 3420 Tower, Intel Xeon E3 -1225v5 3.3GHz,8GB Ready to build
$67.49
Intel Xeon E5-2680 v4 SR2N7 14 Core 2.4 GHz Server Processor
$15.45
Intel Xeon E5-2697 V4 2.30 GHz 18C 2011-3 2400MHz 45MB 145W SR2JV CPU Processor
$49.99
SR1XP Intel Xeon E5-2680 v3 12 Core 30MB 2.5GHz LGA 2011-3 Grade A Processor
$4.23
Intel Xeon W-2145 SR3LQ 3.70GHz 11MB 8-Core FCLGA2066 140W CPU Processor
$94.99
HP Z440 WORKSTATION XEON E5-1603V3 @ 2.80GHz, 16GB RAM 250 GB SSD Win 11
$119.99
Matched Pair __ Intel Xeon Gold 6152 2.1Ghz 22-Core 140W CPU SR3B4
$209.95