Tested. Working perfect. See photo. With CPU i486DX2 50MHz, 256KB Cache, 4Mb RAM & Heatsink
 
Chipset SiS 85C401/402 (ISA 486DX/SX Cache chipset)
Socket PGA168
FSB speeds 20MHz25MHz33MHz50MHz
Form factor Baby AT (max 220 x 330 mm)
Dimensions 245mm x 220mm
Cache 256KB
Max RAM size 32MB
RAM type 30-pin SIMM
PSU connector AT (6-pin P8 + 6-pin P9)
I/O ports
1x AT Keyboard
Expansion slots
6x 16-bit ISA
1x 8-bit ISA