Upgrading RAM, some advise?

[Melletjee]

I want to upgrade my RAM
because of the newer games.

Where do i have to look for?
like:
Does it matter if I buy DDR2 or DDR3?
Does it fit with my Motherboard?

I want to upgrade to 8GB RAM
and try to stay under US$121,- = €90,-
But if it is a really good brand I'm able to pay more.

My PC specs:
OS: windows 7 64- bit
CPU: Intel Core I5 2320 3Ghz
RAM: 4 GB Dual-Channel DDR3 498MHz Kingston HyperX
Motherboard: ASRock H61M-S
GPU: GTX 660 SC (2GB) EVGA
HDD: 932GB Seagate (SATA)

if you have any recommendations, please post.

Thanks,

 

[Emerald]

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231314

 

[Melletjee]

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231314

But does it fit in my motherboard?
it says: ''Supports Dual Channel DDR3 1600''
does that mean only 1600?
or is that not important information?

 

[Emerald]

No, you could also use DDR3 1333 or DDR3 1066.

 

[Melletjee]

No, you could also use DDR3 1333 or DDR3 1066.

oke thanks for fast reply.
so almost every RAM stick is compatible?
but why are there 4 rows on the motherboard and you only put 2 in?