Incidentally, you can if you're handy ity an SMT rework statistics n remove the 80386sx chip entirely, and fit a Cx486SLC2e/50 chip directly to the bridgeboard - this is what I did. I have a brand new SLC2 chip waiting patiently for the next 386sx bridgeboard (CBM or golden gate) to come along. 
@Spirantho Cool! The surface mount soldering always scared me.
I have only used the snap on ones. The bad with the snap on ones is they can come off on occasion. They can be expensive (and or rare now of days). But, the snap on ones do have some advantages 1) some (not all) come with cache memory. 2) you can always turn them off. (not that you would want too).
