Mame-X, is there a way to play 13+meg games??

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I know that Mame-X has trouble playing games that are higher than 13+megs due to ram, (don't know anything about ram, lol) Here's my beef. My marvel vs street fighters, and marvel vs capcoms are about 20megs, and play 100% perfect (video and sound) on fbax. I'm a huge mortal kombat fan, and I can't play mk3, umk3, on Mame-X. My MK2, the sound crackles, and the video is kind slow (it's only 12 megs) MK3, UMK3 are about 15-16megs. My question is, will there be an upgrade Mame-X where it will be able to handle 20+meg games (like fbax) or, do I have to do something internal to my xbox?!? (something to do with ram i take it huh) I'd really like to know what to do, to get my MK's playing. This xbox keeps amazing me everyday. Thanks for reading, and thanks for your inputs.

P.S. Also, don't tell me to go play the snes, or sega versions, lol. If I'm able to play the arcade versions, I want to play the arcade versions, lol. Thanks again guys!!