Yes and the new 50MHz processor will run at 16MHz, unless you change something else. Accelerators are electronically meaty, so they boost the clock speed, provide logic for everything hanging around the PDS slot and attempt to modify everything that uses a timing signal (sound, floppy drive, serial). Typically accelerators require a combination of hardware and a software INIT/CDEV.
I could plead the multiplicity of Macs in my sig. to service (or serve), or blame tomlee59 for not finding and lending to me his round tuit, but the plain fact is ... nuffink. But, if a suitable DayStar PowerCache accelerator were to drop onto my doorstep in the small hours of some morning, and I were to have no socketted MLB, imagine my chagrin.
But that's it! It's all about the warm fuzzy! Having part of the dream gives one the hope that someday the socketed processor will be found and the board will be ready for it!
Confirm? Not at this distance. But assert that there is no doubt, no shadow of doubt, no possible doubt whatever (with apology to W.S. Gilbert). For one, as Charlieman noted, the shadow and height-above-board are giveaways. For two, there is the PGA packaging as an even-more-certain giveaway.
I guess I am just odd then. I get warm and fuzzy when I can put classic Macs to good use. Having things and never putting them to use doesn't thrill me. Such would be the case for me if I bought a socketed SE/30 board and waited around until I could put that socket to proper use.
