I am curious about what configs you all are using for your RP4 crunchers.

What memory size version?
What OS? 32 or 64 bit?
What OC settings, if any?
What enclosures, heatsinks, fans, if any?

I have had a 2gb version running since they came out. It is in one of these stands with a fan and heatsinks. It has been running 32bit rasperian (now Raspberry Pi OS), with no OC until now. I just overclocked it to 2.0ghz with 6v, based on the instructions here. It seems to be running stable now, at ~54 degrees, running 4 tasks of WCG covid19.

I just bought an 8gb version, and will be installing the 64bit beta version of Raspberry Pi OS tonight. It will be interesting to see how BOINC and the projects that support RP4 will deal with a different architecture (aarch64), if they have apps that will work.