Whats better to get?

[Greantea]

Hello, i wonder what is better , a 2x2gb ddr2 ram or 4gb ddr2 ram?

Also what do i do if i will install a new video card?

 

[lexron]

You have to read motherboard manual does it support one stick ram or must two...for videocard you need install drivers only

 

[PyroRaider]

Depends if the motherboard supports Dual Channel
Here are eomeinstructions on how to install a gpu
http://www.pcworld.com/article/2913370/how-to-install-a-graphics-card.html

 

[Dark Lord of Tech]

What board do you run?

 

[Greantea]

Asrock g31m s r2.0

 

[PyroRaider]

As i see, your motherboard does support Dual Channel
Go for 2 sticks of 2 gb

 

[Dark Lord of Tech]

Dual Channel DDR2 memory technology
Get 2x2 ram your board supports it.

- Dual Channel DDR2 memory technology
- 2 x DDR2 DIMM slots
- Supports DDR2 800/667 non-ECC, un-buffered memory
- Max. capacity of system memory: 8GB*