F18 Interceptor.

Yup was thinking that myself...will do ;)

Lemmings 2: The Tribes

With more than 1MB Chip RAM you have extra sound effects and with any extra RAM reduces disk access, probably using caches.

I don't know if that applies also to the first Lemmings game.

Smash TV: Preloads the levels into expansion memory to reduce (or eliminate completely) loading. I think another ZZKJ game does the same.
Pro Tennis Tour 2/Great Courts 2: Speech available if you have 1Mb chip memory.

Manchester United Europe.

With 1MB total RAM you have animated substitutions and action replays.

F/A 18 Interceptor plays music if you have 1meg if I remember correctly?

I believe Prime Mover reduces disk access like Lemmings 2 does.

John Madden Football

Extra music during the game with 1MB of RAM or more.

Info Frenzy! Thanks guys

Team 17's Arcade Pool does something but I forgot what.

Zeewolf 2 makes good use of Fast RAM for a frame-rate boost.

Pinball Dreams reduces loading if you have 1meg, by storing the menu and music in extra ram instead of having to reload from disk constantly.

Speedball 2 loads all the game into extra ram which means no ingame loading.

Gods stores loaded levels into extra ram, if you have to replay it, it loads from ram not disk.

Mortal kombat 2 :there are more sound effects if you have 2mb+
also disk usage is reduced relocating some parts in ram

Desert strike: there are more sound effects for 2mb +
Jungle strike: there are more sound effects for 2mb +

also there are tons of games that runs with 512k but with 1mb there are more sound effects or pluses ex : paradroid 90, unreal etc

other games like Hugo loads totally in memory if there is enough memory available... ( no more disk activity during the game once is fully loaded)

Just now i remember...

SDI (Cinemaware) - 1mb loads the whole game into ram
Lords of the Rising Sun - The more memory, less loading times
Rings of Medusa - 1mb gets lots of sampled sounds
First Samurai - 1mb gets extra sounds (oh no my sword, haleluya...), and also in-game music.
Unreal - 1mb gives option to play with excellent fx sounds
Dragon's Lair II - 1mb gives less loading times and sounds (¿and the scene intro/death?, not sure about that)
Birds of prey - Intro only plays with 1mb
Pro Tennis tour - Is said before, as it gives more sounds, but also more ram gives option to play girls vs boys.

I seem to remember Megalomania liking more chip ram for samples...

Titus the Fox, has in-game music with 1mb

I seem to recall wing commanders taking advantage in the frame rate side of things but cant be sure....
Mind you a couple of extra volts might have helped as well for that one :)

Yep it definitely benefits from Fast RAM, I think only 32bit Fast RAM though :confused

2 corrections
Pro Tennis Tour 2 - More ram gives option to play girls vs boys (that option is not available in PTT1)
Dragon's lair II - The more ram does not makes shorten loading times: with 512kb some scenes need to stop and load at half play, but with 1mb the loading will be longer to load all data but scenes does not stop for loading at half play...

Wing Commander - 2mb gives hand animation when controling the ship, and animations/images on radio messages.
Welltris - 1mb will play beautiful russian music
Lotus 2 - 1mb gives extra speech and fx and less loading times

Final Fight: Awesome attract mode music if you have 1Mb.