The first config I used to play MTW on was:
- QDI Titanium IB+ motherboard
- Pentium MMX 233MHz (first OC'ed to 266MHz but it refused to run that fast after some time)
- 16MB 3Dfx VooDoo3 2000
- 128MB RAM (later 256mb)
- Win98 SE
- up to 1024x768 but usually 800x600 map, 640x480 battle.
- about 5-10 fps in 1v1 battle, you can imagine bigger battles. Felt like turn based game even during battles.

Actual config:
- ASUS P5Q-E mb.
- Intel Xeon E5450 3.0GHz (4 cores)
- 3GB Radeon HD 7950, PCI-E
- 8GB RAM
- Win 7 64bit
- 1440x900 (1200x900 in MTW)

Both configs are rock solid. Zero crashes guaranteed.