Here's something iv been noticing after running a few tests and playing a few 3d games on a DX2. It doesn't seem to be performing as well as other same spec DX2 machines iv seen.

The big example here would be Rise Of The Triad. That game runs slightly-dreadful at fullscreen \w statusbar and high detail. On the flip side though i swore iv seen videos online of people running DX2 setups with equal spec that handle the game on the same settings MUCH better.

My current setup is as follows:
486DX2-66
8mb ram
256K Cache
Data Expert EXP4044 motherboard
Tseng Labs ET4000AX 1Mb (ISA)
Generic Yamaha YMF719 Soundcard
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For research, i have run a few select benchmarks. These where run more then one time, from a clean bootdisk with nothing else loaded (no sound, etc)

-DOOM (full screen, high details test)- -Topbench- -3Dbench 1.0c-
FPS: 15.06 Score: 122 FPS: 28.6

CacheCHK confirms all 256k of cache present and functioning. All System-ID programs correctly list the processor as a 486DX-2 @ 66MHz.

I suppose those scores are OK for the type of system, but iv seen better. Seen some benchmarks put Doom at around 20 fps, 3DBench definitely has seen better on other DX2s, and as mentioned earlier, iv seen ROTT play better too.

Now the big question i have here is where the bottleneck is. Unless i'm just seeing things wrong.
I wouldn't normally put too much thought into that as 3D isn't why i initially build the machine, But i'd like to up-it to a DX4 for the extra power and i'd be more curious if i should throw that money first at a VLB video card.

That's assuming of course the ISA Tseng is causing a slight dip in performance (fair), but i'm not too sure yet.