The Cyrix 486 chips were said to be 5-10% slower than the intel parts at the same clockspeed.
The DX/2-50 will be a little faster than the DX-33 at CPU intensive things, but fall behind at I/O intensive stuff. I remember reading the reviews in PC World and PC Magazine in early 1993, and those two CPUs were roughly equal.
I've reinstalled the 486DX 33MHz for try bios configuration
Doom result 35x1091/2050=18,62 fps..
same of Cyrix DX2 50MHz
EDIT: SpeedSys drops from about 20 to about 12 points
Speedsys apparently isn't a very accurate tool for measuring CPU speed on older systems. The DOOM result is probably more useful for performance comparison.
The Cyrix 486 chips were said to be 5-10% slower than the intel parts at the same clockspeed.
The DX/2-50 will be a little faster than the DX-33 at CPU intensive things, but fall behind at I/O intensive stuff. I remember reading the reviews in PC World and PC Magazine in early 1993, and those two CPUs were roughly equal.
I have numbers for Intel chips, Phil's test suite :