It's alive

😁

So it turns out the socket is indeed a socket 3. But I couldn't find any voltage jumpers, though after some more searching on the net, there is indeed a way of auto setting the voltage for certain boards.

I came accross some old threads on VOGONS (seriously what ISN'T on VOGONS), which linked to this fantastic resource:

http://web.inter.nl.net/hcc/J.Steunebrink/amd5x86.htm

It shows a simple test for checking if the board auto sets the voltage. And it does! 😀

I tested with VOLDET grounded and floating and the Voltage did indeed change from 3.44V to 5.01V confirming that I can use these lower voltage CPUs in my Acer.

So I inserted an AMD 133 and although the POST screen thinks it's a DX-2 (I believe the 2x multi is 4x with the AMD), the CHKCPU utility identifies it as a DX4 with the correct clock speed.

I set the FSB to 25MHz and later to 33MHz and ran some tests and took pictures. I haven't got a cooler that fits, just one for Pentium sized coolers, so I just placed it loosely on-top.

One thing about this machine: It has no L2 cache (mainboard cache). The sockets are all empty. So keep this in mind regarding the benchmark results. Not sure how much of an impact it has...

The Intel DX4 works as well. Gets detected properly and benchmarks similar to the DX4-120

I have a 486DX4-T100 which gets detected as a DX2 in my Socket 3 Olivetti M4 434S, strange isn't it ? 🤣