Just look around on the motherboard itself, if it is on there it will be silkscreened somewhere, quite often near the PCI slots. The age mobo you are talking about, it should have something on it.
Could D/L AIDA32 as well, run it. It might get it for you, will get you closer anyway.
http://www.majorgeeks.com/download181.html
As for the RAM, identifying the mobo will give you all the answers. You will quite possibly need to do that eventually anyway for drivers and BIOS updates.