Dual or single channel?

[Zulu]

I am buying a laptop from a website that is offering me the same price for either dual or single channel RAM.

My options are;

2048MB (2x1024) 667MHz DDR2 Dual Channel

2048MB (1x2048) 667MHz DDR2 Single Channel

What should I be going with? And what are the benefits?

Thanks

 

[Zulu]

Thanks for the help.