AS far as i'm aware...
CPU - there shouln't be any problem, i used to have redhat 8 with my amd athlon Xp and it ran fine, so i imagine it will work.
RAM - i very much doubt any compatibility problems.
Monitor - shouldn't matter
Motherboard - shouldn't matter
CD-RW and DVD Rom - souldn't matter
Graphics card - I can almost guarentee that RH9 will come wih drivers for these cards, if youre still not sure, search to see if anyone has had problems in the past.
About modems, i would very much reccommend getting a serial/usb external for dial up. they come very cheap (if you're uk, i think dabs has one for about £20, which is serial) more or less any will work fine...
then again, im a newbie so dont take my word for anything i said
