Bridgeboards can be quite useful with enough modifications. My main bridgeboard in my A4000 (CSPPC/060) has a Cyrix 486SLC/2 50MHz chip, with an ISA bus running at nearly 20MHz, I think it is (can't remember for sure, but it's way overclocked). Coupled with a fast EIDE card with a 4GB Disk-On-Module SSD, a good SVGA card and an ISA sound card (Yamaha OPL-3 I think it is), it runs Ultima VII perfectly.... and that was what it was installed for.

Getting cards that work on the overclocked ISA bus is the tricky bit, but the speed increase on graphics-heavy stuff is huge.