Wasn't there a trick to knowing if your memory/cache would run stable at 0ws?
It had something to do with the speed IIRC.

Currently I have no space for the 4 486 boards I have so I must decide which one or two to keep.

EISA Board:
Pro: Has EISA, decent video card, has L2 cache, 16MB with 4 30pin simm slots free
Con: 5v only, limited to ISA or EISA cards, goddamn huge, uses 30pin simms, SCSI seems to be more of a novelty vs using IDE+Compactflash

M919:
Pro: Has PCI, ISA, and VLB, uses 72pin simms, pretty good memory bandwidth, onboard I/O, supports a ****tonne of CPUs
Con: No L2 cache!

ISA 486-SV2:
Pro: Has VLB, overdrive socket, L2 cache
Con: I have no decent VLB cards, 30 pin simms, 5v only

I'm thinking of keeping the last board and one M919 since it seems to be a fair balance between having L2 cache and having PCI.
The EISA board is neat but limited to 5v CPUs unless you have that special socket which doesn't seem to exist anymore.

[Edit]
Maybe not...
The M919 is basically equal with the 486-sv2 board when it comes to DooM at 66MHz despite having no L2 cache.
Both get ~25 FPS with their ram and cache timings tightened up.
😳