SUBSIM Radio Room Forums - Could someone help me refit my 10 year old PC for Subsim 3?

Right there with ya, man! I was running SH3 on a computer with 256M ram that I got for free from a friend.
I got some parts from some really nice people on this site, and I eventually broke down and got a 1G stick of ram on the web for $20us, and now it runs beautifully! don't let these guys get you down, just be choosy with your mods and (if you can) learn how to pare some of it down to fit your style.

let's see, my specs...
KT4AV MoBo
AMD Athlon 1.2 MHz
1.25G RAM
GeForce 7300GT with 512M of ram itself.

and my modsoup...
NYGM with H.Sie's hardcode fixes
MEP v3
Hires subs with waterstream
type II interior (my own and the torpedo room ported from sh4)
IABL ships for NYGM
Turms your way
and a mess of sound mods.

get to know your computer, and only load mods you actually use!
not bad for an 11 year old machine!