i put in cyrix fastmath fpu.
result is here.
top is cyrix 486drx2 66Mhz, bottom is ti 486dlc 40mhz
cyrix 486drx2 speedsys youtube : https://youtu.be/A8jqm6-wp-M
ti 486dlc 40MHz speedsys youtube : https://youtu.be/W4AHeZaj_g4
and i run doom timedemo demo3 benchmarks.
result is here.
AMD 386DX 40MHz + CL-GD5428 VLB 2MB 9,124 (8.19 fps) youtube : https://youtu.be/EAPnbZjOOxQ
AMD 386DX 40MHz + CL-GD5434 VLB 1MB 8,986 (8.31 fps) youtube : https://youtu.be/iFKv0DFVooA
AMD 386DX 40MHz + CL-GD5434 ISA 1MB 10,154 (7.35 fps) youtube : https://youtu.be/8-rJcTLY8GE
TI 486DLC 40MHz + CL-GD5428 VLB 2MB 5,838 (12.79 fps) youtube : https://youtu.be/EzJfuCAVfdQ
TI 486DLC 40MHz + CL-GD5434 VLB 1MB 5,813 (12.84 fps) youtube : https://youtu.be/NvVS9KtNr10
TI 486DLC 40MHz + CL-GD5434 ISA 1MB 6,621 (11.28 fps) youtube : https://youtu.be/O1m-Q7XhSVY
Cyrix 486DRx2 66MHz (without 486drx utility) + CL-GD5428 VLB 2MB 4,950 (15.08 fps) youtube : https://youtu.be/dW1OpcHMdEA
Cyrix 486DRx2 66MHz (without 486drx utility) + CL-GD5434 VLB 1MB 4,767 (15.66 fps) youtube : https://youtu.be/wDdfEkWKYz0
Cyrix 486DRx2 66MHz (without 486drx utility) + CL-GD5434 ISA 1MB 6,212 (12.02 fps) youtube : https://youtu.be/S_EbIwLshFc
Cyrix 486DRx2 66MHz (with 486drx utility) + CL-GD5428 VLB 2MB 4,705 (15.87 fps) youtube : https://youtu.be/kTkd8FZjOUY
Cyrix 486DRx2 66MHz (with 486drx utility) + CL-GD5434 VLB 1MB 4,556 (16.39 fps) youtube : https://youtu.be/IPp316s2TCc
Cyrix 486DRx2 66MHz (with 486drx utility) + CL-GD5434 ISA 1MB 5,938 (12.57 fps) youtube : https://youtu.be/vmZN3jwlbus
CL-GD5434 VLB 1MB is Orchid Kelvin64 VLB
CL-GD5434 ISA 1MB is Diamond Speedstar 64 ISA
CL-GD5434 have 64-bit memory bus. but it requires 2mb memory. if have 1mb memory, CL-GD5434 running only 32-bit memory bus mode.
my cards have 1mb memory.