AAEON SBC-555 CPU Boards-half-size 586 CPU Card with ISA Bus with support for Intel Pentium MMX 166~233MHz, AMD-K6-2 233~300MHz, Cyrix 6X86MX-PR166 ~ 200GP/M2-300MHz, and IDT Winchip C6 200~240MHz
P5A-BRev1.04 ASUS System Board
MMX - Chessprogramming wiki
Gigabyte GA586S2 MMX AMD K6 CYRIX M2 READY DRAM & SDRAM MIX POSSIBLE Motherboard - Retro PC Store
MMX (instruction set) - Wikipedia
Performance - AMD K6-300
Pentium MMX vs AMD K6-2 - YouTube
AMD K6 MMX Gold - 25 x 25mm 1" Domed PC Case Badge Logo Rare New adhesive | eBay