I think that most internal computer soundcards still record and play at 16 bits, unless of course you had a computer built for audio.
There is one way to tell what your card does for sure. Try setting your audio recording app( cakewalk, cubase, etc ) up for 24 bits. It won't let you if the card isn't capable. If you don't have an app that is capable, you can d/l a demo that can probably tell you. I think even some freeware DAW's now support 24 bit recording. KVR audio or Shareware Music Machine are great sites to find them.
I still have my M-Audio Audiophile Card in my older computer. It's a 24 - 96 card that does a very good job, and the noise floor is quite low for a lower end card. It is noticeably better than my Soundblaster Live card was ( cleaner, lower noise floor, etc ).
I paid $ 179.00 USd for it a few years ago. I just looked and Z sounds has it for 99 Usd.
AJ
[This message has been edited by Bluezplayer (edited 01-27-2005).]
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AJ