How many DIMM's with DDR3?

[buzzby]

Hopefully a simple question.

looking at get this mobo

Is it best to get 2 dimms or do you need 3? Basically my question is what does the motherboard CPU and memory prefer.

Would be looking to get 8GB. What is a good compromise speed. Not looking for the fastest machine in the world but would rather the ram is not the limiting factor.

Thanks in advance

 

[buzzby]

Thats great. Had already thought of the XMS3 set so glad to see i'm on the right page.