4x2gb kits: Compatible?

[flashfir]

G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBRL
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231277

G.SKILL Sniper 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBSR
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231416

Can I stick all these in my mobo? Compatible? All the specs are the same... I'm going to run them in MemTest tonight.

 

[flashfir]

Oops. Forgot I had 2x4gb & 2x2gb. I'm stupid.

 

[flashfir]

For some reason I thought my new kit was 4gb... -_-;

 

[flashfir]

Ramdisk a good idea?

 

[flashfir]

Best answer selected by flashfir.