Buying a new Mobo and RAM

[ReapingDeath]

I need to buy a new mother board very badly and some RAM to go with it. I need something that will be compatible with an ATI RADEON HD2900PRO, an ENERMAX Liberty 620watt PSU (specifications here http://www.newegg.com/Product/Product.aspx?Item=N82E16817194004). Would I need to upgrade from my AMD Anthlon 64 939 socket processor? I need a good motherboard that I can use for Crossfire later. And I need some RAM, sadly, these are the two parts of the computer I know nothing about. I do not know what kind of RAM to get, but I would like 2 gigs or maybe even more depending on how much it costs, but for now ignore the cost and if anyone could help me on finding some RAM and maybe a mobo then thank you VERY VERY much.

[glc]

You will need to upgrade from your 939. Quality 939 boards are getting very hard to find and they use (relatively) expensive DDR1 ram.

What board do you presently have and what's wrong with it?

[ReapingDeath]

You will need to upgrade from your 939. Quality 939 boards are getting very hard to find and they use (relatively) expensive DDR1 ram.

What board do you presently have and what's wrong with it?
Gathering information from the box, I have an ASRock 939dualsata2 and it says DUAL SERIES! The problem I have with it is that its 3 or 4 years old and I want to go into crossfire soon and my current mobo doesn't support crossfire. Since christmas is coming around the corner, why not ask for a new one!