I like how this thread slowly morphed into a "show off your otherwise stock high-clock 486 rigs" thing. Not complaining, just an observation.
TBH the "ultimate ___" meme, in 2026 at least, is strictly for market speculation purposes anyway.

Anyway, I might as well post the results I get with my MV035F-based Am5x86-P75 setup, running on 40MHz FSB at 160MHz.
Motherboard: EDOM/Wintech MV035F /w OPTi 82C802GA chipset
CPU: AMD Am5x86-P75 running at "P90" equivalent speed, 160MHz; 40MHz FSB
RAM: 16MB 30-pin FPM SIMMs
Cache: 256KB, dual-banks, made out of UMC data SRAMs and a wonky little Winbond 16Kx8 TAG
VGA: Cirrus Logic CL-GD5434 VLB, 2MB FPM
Sound card: Some ESS thing, due to be changed to an OPTi 82C930 (due to me needing a second IDE interface for the optical drive)
HDD: Quantum Fireball 540AT 516MB thing
OS: Windows 95 RTM upgraded to 'OSR 1'

Results:
3Dbench 1.0C: 82.5 FPS
PCPlayer benchmark: 21.1 FPS @ 320x200, 7.8 FPS @ 640x480
Doom timedemo: 2134 gametics in 1641 realtics (FastDoom knocks this down to 1076 realtics)
Speedsys: CPU: 58.22; RAM: 92.46MB/s L1, 54.90MB/s L2, 32.97MB/s off-cache; VESA Memory: 2048KB (15765 KB/s), HDD: Average/Max seek 10.39 / 15.27 ms, Random seek: 8.53 ms, Track-to-track 2.18 ms, Random access 15.88 ms, linear verify speed 1878KB/s
Cachechk:Reading: 1-16KB 7 uS/KB, 32-256KB 15 uS/KB, off-cache 29 uS/KB; Writing: 20 uS/KB across the board; Results: 164.9MB/s L1, 74.4MB/s L2, 38.4MB/s off-cache

Pretty hum-drum compared to the garish (meant in a good way) results common of this thread, but it sure feels nice. The OPTi 82C895/801/802 isn't about to win any benchmark awards for its stellar off-cache throughput, but it handles 40MHz FSB reasonably well once you've sussed the cache (dual banks or bust). Long-term longevity remains an open question mark. We'll see if this one disintegrates at high FSB like so many SiS and UMC 486 chipsets do.