I have a 256mb pc2100 ddr memory and i can see that i have another available slot. if i want to buy an extra memory does it only have to be ddr and of any make or does it have to be of a specific type and match my other one perfectly? Also, there are some Graphic cards that have a ddr at the end does that mean you can insert them in the part of the pc where the memory goes or does it have to go in a special part made for the graphics?

First off, you can go out and buy a stick of lets say PC3200 but if your mobo (motherboard) can only handle 2100, then it will work only at the speed of 2100 and therefore being a waste of money, but if your mobo supports the 3200 and you have a stick of 2100 in there, then it will run at the speed of the 2100. To answer your second question, NO. A video card needs VGA, and SVGA compliant slots in order to produce an image, and the slots where your memory goes, have access directly to your CPU so the CPU can store temp. data in there for future use and then call that data back form the Memory, making your system run smoother. The AGP slot is the most common and most widely used today. You can have a PCI video card too. Growing slowly in popularity but looks like a good deal, is the new PCI-x, where it uses a Serial interface for communications. You can be amused by the simplest of things. The smartest people in the world, over-look the smallest objects. War does not determine who is right, only who is left.

May sound confusing, (i kinda did myself too when i reread it) and if you need me to clarify on someting just ask. You can be amused by the simplest of things. The smartest people in the world, over-look the smallest objects. War does not determine who is right, only who is left.

ok, so basically by adding another 256 or 512 surely i will get better performance or no is that not the case?

if u add more ram you will get better performance. its the cheapest way of gaining extra oomph! i would strongly recommend Crucial www.crucial.com or www.crucial.com/uk Simon

You will only get improved performance by adding more memory, if you currently do not have enough. The amount of RAM needed is determined by the number and type of programs running.