486 Interposers

[RJBJR]

And for anyone looking for the interposer http://www.amazon.com/TrinityWorks-Intel-Voltage-Converter-Adapter/dp/B004IJ681O

 

[NeXT]

An update now that the system as arrived and I could test.

There's no magic smoke when plugging it in however it won't POST so I assume we need to be running at most a 3x multiplier.
I can however get it to work in the older Type 2 complex by removing the Overdrive 50 and the SX 25 and putting in the SX's socket.

I've been out of the hardware level overclocking for a while. Were you able to forcefully set the multiplier by removing or soldering pins like on the later socket 7 machines?

Edited: Apparently yes. According to this it's as simple as removing and covering over pin R17 to force the multiplier to be x3.

Edited: Huh, that didn't work.

 

[NeXT]

So it turns out that it isn't the chip that's causing me grief.

some older systems (particularly IBMs) won't work with the am5x86 in 4X mode. Apparently the CPU uses different IDs depending on how the multiplier is set. Some BIOSes won't boot with an ID they don't recognise. Short of a BIOS update, there are no easy workarounds....unless you can set the adapter to 3X mode an wedge a 1.33X PLL in there somewhere.

Going to be honest and say I don't know where to source the PLL, much less what exactly the PLL is. So for the sake of convenience and the fact that it CAN work, I have no choice but to source an interposer. Thanks for that link RJBJR.