Got the AMD 5x86 work on this board, jumpered as 80486DX2-66 except voltage of course (3.3v) and multiplier (JP31, jumpered as x2).
I did not even upgrade the AWARD Bios v4.50, Release 11/01/94', 11/03/94--2C4X6H01-00.
The CPU is reported as Am486DX4-120 at boot, but chkcpu detects an AMD x5 at 133.7 MHz, x4 multiplier, 33.4MHz bus.
I tried to jumper it as P24D (486DX2 rite back) but the PC does not POST. No beep, nothing. I will try with my POST debug card. So for the moment it works as write through for the L1 cache.
Performance is great, e.g. Descent with a very good framerate, much better than the DX2-66, Tombraider is almost playable - but I still prefer a PCI machine with a Voodoo Banshee for that 😉