General Knoppix support for those who've read the FAQ at the Wiki
EXAGRID EX32000E Server Intel Xeon E5620 @ 2.40GHz 16GB RAM 16x 2TB HDD
$679.00
Dell PowerEdge R720 Server - 2x8c CPU,256Gb RAM, 128Gb SSD/3x900Gb SAS, Proxmox
$340.00
DELL PowerEdge R730XD 24x 2.5" Server Dual 750W Dual Heatsink - BareBones TESTED
$269.99
Dell Precision T3600 | Xeon E5 | 16GB | GPU | 128GB SSD | Win 10 Pro
$115.00
Intel Xeon Gold 6140 SR3AX 2.3GHz 18-Core Processor CPU
$39.99
Intel Xeon E5-2697A V4 2.6GHz CPU Processor 16-Core Socket LGA2011 SR2K1
$39.99
Intel Xeon E5-2680 v4 2.4GHz 35MB 14-Core 120W LGA2011-3 SR2N7
$17.99
Intel Xeon E5-2699v4 SR2JS 2.2GHz 22-Core 55MB 145W Server Processor CPU
$144.95
Dell Precision T5600/t5610 Xeon E5-2670 2.6Ghz 16GB DDR3 RAM NO HDD Nvidia
$90.00
Rare WaterCooled HP Z800 Workstation Dual Xeon X5680 16GB RAM 120GB SSD Nvidia
$279.56