[lafester]

the titan has plenty of system memory so i just install everything there.
not sure why you want to keep stuff on the storage card... save that space for maps and mp3s and videos etc.
i also keep a copy of all my .cabs there so i have a backup.

if for some reason your card fails or is removed you won't be able to run any of those apps untill you reinstall.

ram use does not change either way if thats what you are concerned about.