Thanks for that irishron I'll give that ago. Implemented FactionHeirs tutorial about removing ambient effects this afternoon which works. So was thinking about if i changed the size of the textures myself...so its saved me some work. lol
Edit: Been playing so far with those two changes this evening and I've noticed a small but noticeable improvement which is good.
Also looked at the cpu list of my Socket A m/board and I can go upto 3200 Athlon or 3000 Sempron if I can find one. So good news there. My RAM is under clocked at the moment for the present cpu I'm using. Which I know is compatible with the faster bus speed needed by using a faster processor. Looking on Ebay for quick idea on prices it makes sense to go for that option giving me some more grunt rather than a relatively newer but out dated AGP graphics card.