Hi.

I just got my hands on a 486 MOBO from eBay. 50ish bucks from a guy in Ukraine, apparently they are a good source of old electronics. Anyway, this is the MOBO:

GMB-486UNP Socket3 motherboard + Intel 486 25 Mhz + 4 RAM + 256 cache VESA ISA

Now, on another auction site I found a Texas Instruments 486DX2 66 Mhz for 10 USD including shipping.

Here's the thing: the manual states the board supports up to 256k cache (which comes with the board), and in 2 configurations: 25ns for 25 Mhz processor and 20ns for 33-50Mhz. It never says anything about 66 Mhz for cache, but it mentions support up to 66 Mhz processors. The seller doesn't know what speed they are. The pictures from the auction show the following numbers on the cache chips: UM61256CK-20 9348S N91474. I can't find any info on those chips.

Could there be issues if I have the wrong type of cache/processor?
Do you think that the serial number is describing a kit of UM61, 256Kb, 20ns chips?
The manual never mentions TI processors, are they incompatible?