I got the Corsair XMS3 1333Mhz.. did not compare it with others...

If price almost the same, go with a more reputable brand....or brand with more shops that carries it

Sometimes it also depend on yr experience with that brand.... mine was either Corsair or Kingston...

Somehow I made my personal decision that Corsair is a much better brand for higher speed memory..

Read user reviews on amazon or some other website..

A bit strange to see you use 2 different size for the DDR3 ram...

Dunno if yr laptop hv 3 slots or not but most Intel i7 mobo comes with 3 slots or 6 slots for Three Channels of memory bandwidth...

Pls hv a look at the article below...

http://www.techreport.com/articles.x/15967


Use CPUID to check the memory channels the system is currently using...