What diff will more RAM make.

I am really getting infuriated with my PC because its performance is real bad.

Firstly i am having great difficulty finding a compatible RAM i only have 512mb RAM but problem is that its a DDR PC2-5200 i have been to all shops bought two different ram cards neither worked.I have been told that it was one of the first ddr2 chips and i must go to a specialist shop to find one.

Secondly my graphics card is ATI Radeon Express 200series.Which i guess is also not suited to gaming.

I have intel(r) pentium(r) D CPU 2.66ghz processor.

I run crossfire on lowest graphics setting and have no other programmes running.my problem is when more than 6 players my fps goes down to around 18/25 fps or lower and spikes constantly.

Maybe sounds a silly question but what additional purchases will make the biggest difference.For example when only 4 people playing and i get 45 fps i can play pretty well as game runs smoothly.But when lots of players its real difficult to play and mostly end up with negative or slightly positive k/d.
I am not really a tech expert but i think my cpu processors are adequate.
I am on a tight budget but if say i have 100euro maximum to spend what would you recommend? I dont need a state of art game computer as basically crossfire is only game i really play.So with that in mind could someone please give me some guidance and tell me if it will really make big difference for my k/d.

Also this problem about finding a compatible ram for my computer.Does anyone know anything about ddr pc2 5200?

I should also add that i have a 10euro saitek mouse and a really old crappy keyboard.So how do i pimp my computer on a budget?
thanks in advance
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