General Knoppix support for those who've read the FAQ at the Wiki
Intel Xeon E3-1285 V3 3.6 GHz 8M Quad-Core SR14W CPU Processor
$49.50
HP Z440 Workstation 18Cores Xeon E5-2699 V3 128GB 1TB SSD 2TB WIFI WIN11 R5-340X
$369.99
Matched Pair Intel Xeon E5-2697 V2 E5-2690 V2 E5-2680 V2 E5-2670 V2 LGA2011 CPU
$56.90
Lenovo P520C 6 CORE XEON W-2135 RTX 2080 64GB RAM 2TB SSD + 4TB HDD WIN11 WIFI
$349.99
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
$3.96
Intel Xeon E7-8890 V4 2.20GHz 24-Core 60MB LGA2011 Server CPU Processor SR2SS
$29.99
Intel Xeon E5-2667 V4 SR2P5 (3.2GHZ/8-CORE/25MB/135W) PROCESSOR CPU
$29.95
HP Z440 Workstation 18 Core E5-2699 V3 128GB RAM 512GB SSD 2TB WiFi WIN10 DVD
$281.00
Intel Xeon E5-2673 V2 SR1UR 3.3 GHz 8 Core 25 MB 110 W LGA 2011 CPU Processor
$40.00