General Knoppix support for those who've read the FAQ at the Wiki
HP Workstation Z640 2x Xeon E5-2623V4 32GB Ram Dual 256GB SSD K420 Linux GA
$161.24
HP Z440 Workstation 18 core Xeon E5-2699 V3 64GB 1TB SSD R5-340X WIFI WINDOWS 11
$249.99
Apple MAC Pro A1481 Late 2013 Xeon Quad-Core 3.7GHz 32GB 1TB SSD FirePro D300
$285.00
Intel Xeon Silver 4214 12-Core 2.20GHz FCLGA3647 CPU Processor - SRFB9
$129.99
SR1XP Intel Xeon E5-2680 v3 12 Core 30MB 2.5GHz LGA 2011-3 Grade A Processor
$3.96
Intel Xeon Gold 6140 SR3AX 2.3GHz 18-Core Processor CPU
$32.79
Intel Xeon E5-2680 V4 2.4GHz 35MB 14-Core Processor SR2N7 *km
$13.99
Intel Xeon E7-8890 V4 2.20GHz 24-Core 60MB LGA2011 Server CPU Processor SR2SS
$29.99
Apple MAC Pro A1481 Late 2013 Xeon Quad-Core 3.7GHz 16GB 1TB SSD FirePro D300
$235.00
INTEL XEON 5218R GOLD 2.1GHZ PROCESSOR | SRGZ7
$549.99