Honestly asking though is it worth that trade off? I enjoy watching people benchmark older Intel x86 based chips and without cache they are frankly awful slow. I'm not sure two without cache beat one with. The BeBox did run a totally different processor though so I have zero domain knowledge for that which is why I'm genuinely curious.

Looks like the BeBox motherboard didn't have the external L2 in the first place.

Besides web sources, logic dictates this as well: Since dual-cpu was its selling point, it wouldn't make sense to ship a disabled L2 implementaton on the mobo at extra cost. There was no single-cpu model.