Right now I have a pretty basic PC in my MAME arcade cabinet:
Athlon 1.0 GHz (w/512mb RAM), Radeon 7500 AGP Video card
Since I've rebuilt my main computer, I can now upgrade my MAME arcade computer to this:
Pentium 4 - 2.53 GHz (w/512mb RAM), Radeon 9700 PRO Video card
One thing I've noticed, is that on my current MAME/PC machine is that games like Hamsterball run very slow and sluggish. I haven't tried many other games because I mostly use MAME (eg. Non-3D games).
Would it be worth it for me to put that new computer into my MAME arcade cabinet? It would be nice if the Dreamcast emulator was better, but since it's not I'm in the process of putting a real Dreamcast in there.
Are there any other good PC 3D games that are arcade-ish?