I'm running a 486BL machine here, mine was originally clocked at 3*25 for 75MHz but with help from a friend I'm using a modified BIOS to set the multiplier to 2x as 3*33 wouldn't even POST. Technically the CPU is underclocked now at 66MHz but as you can see from the second screenshot, I don't lose a ton of CPU performance and in return every other aspect of the system is uplifted (RAM, IO, Video, FPU). It doesn't seem to properly detect the cache, I have 16K L1 and 256K L2, but as I said in the SIV thread even cachechk doesn't think I have L2 even though there is a small (but measurable) difference in latency for accesses below/at and above 256K. Without a CPUID instruction, it seems this really struggles to say anything about the CPU. FPU is an IIT 4C87DLC at 33MHz.
The .zip attachment is the .cvf validation file it generated, I don't know how much use that is to you.
Nanto: H61H2-AM3, 4GB, GTS250 1GB, SB0730, 512GB SSD, XP USP4
Rithwic: EP-61BXM-A, Celeron 300A@450, 768MB, GF2MX400/V2, YMF744, 128GB SD2IDE, 98SE (Kex)
Cragstone: Alaris Cougar, 486BL2-66, 16MB, GD5428 VLB, CT2800, 16GB SD2IDE, 95CNOIE