hi, u thinking of upgrading ram ok but what does your motherboard support? and what number is on your ram modules? you may be able to and most probly can also install faster ram easing the burden of your cpu more, and not just installing more ram ,once again down to spec of motherboard. What operating system windows are you using? do you plan on changing that? cpu most likley old duel core as you mentioned or is it core 2 duo? also sorry but what wattage is you main power supply unit ? somethings have to be checked before buying, then we can see what best suits and can help you to tweak it faster as well, and how much to push it. understand you on a budget most probly looking at a hd 4850 but let us know the other specs if possible, because for the future of ur needs and time present you may pick up a 4870 for same price in march, but b4 new eyes have to know more info,
where in fife cupar? cheers