AJ49er wrote:

BastlerMike wrote:

The jumper settings in TH99 are not covering all supported processors. Though there are much more processor types included in th […]
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The jumper settings in TH99 are not covering all supported processors. Though there are much more processor types included in the GOEFA/EFAUTIL configuration utility, it is not clearly stated which jumpers control relevant processor functions.

I finally found out the correct settings for the AMD 5x86 to run at 133 MHz in writeback mode.
Configure the jumpers according to the AMD 486DX4-100 3V SV8B table shown in EFAUTIL
To force 4x mode connect JP9 pin 2 with JP8 pin 3
To force writeback mode set JP46 to 2-3
Bios version 1.04 or greater is needed in order to get this working.

I know this thread is pretty old, but where can I get a copy of the util? I have this exact motherboard and would be interested in putting in this processor.

Here it is GOEFA "EFA UTILITIES V. 2.00 FOR WIN & WIN 95" (last version, I got it from archive.org).
For me Cyrix 5x86-120GP and Pentium Overdrive 83 CPUs are not works. I'm using bios version 1.05 (last version).