Windows 7 - Ram replacement

Hey everyone!
I have a quick question, i want to buy new ram for my pc, but not sure what to find to buy them. all i know is it's DDr2 and i want to go up to 8G of ram, i got 5G of ram at the moment.

Windows 7 professional 64bit
AMD Athlon 64x2 Dual core Processor 5400+
5G ram / ATi Radeon HD 4650 1G
480W power supply
going to upgrade video card to either 5850 and 5870
or ATI 5670 since it's a mid range causal gamer card.

Welcome
The best advice that I can give you is, Do not buy 3gb of ram. This is called mix and match a big NO No. Go out and buy all that you need.

I agree totally, do not mix and match RAM.

Run Crucial's memory scanner for best advice on what you can install and in what configuration.

I assume that your motherboard supports dual channel memory, as you haven't listed the exact model in your specs. If you already have 2x2Gb matched dual-channel memory modules, then buy another 2x2Gb dual channel set of modules. If you don't already have a dual channel set, get 2 sets of 2x2Gb dual channel modules & be sure to place them in the correct dimm slots per ASUS' recommendations.

It would help greatly if you can get the specific model for your motherboard. You could go to RAM Memory Upgrade: Dell, Mac, Apple, HP, Compaq. USB drives, SSD at Crucial.com & run the system scan. It will give you the info you need to choose your ram. It is a great tool to use in your case - no matter whether you buy Crucial ram or not.

Sorry - After posting I noticed that SeaVixen beat me to it!

It makes a change TBoyd. It's not often I beat anybody at anything!

i didnt put the ram in before.
it's 2G, 1G, 1G, 1G so i should buy 2x2G? or buy a whole new 4 set?

Memory upgrades from Crucial.com - Determine My Memory Needs
this is what i got.
i buy things on amazon because i feel more better there.
not sure if you can help me pick it out on there?

Go buy a whole new set. RAM is not that expensive. You never want to mix and match. Why open yourself for potential problems?

it's all good, heres what i got, posting it to you so you can also see.
Memory upgrades from Crucial.com - Determine My Memory Needs

If anyone of you guys dont mind helping me pick the right ones on Amazon?
that's where i buy stuff and i feel more safe.
i will buy a whole new set to get to 8G of ram since each solt can hold max 2G.
please and thank you guys for helping me.

is this the right ram?
http://www.amazon.com/PNY-Channel-PC...020545&sr=1-10

45$ for the 4G of ram