What type of RAM i should go for?

I'm having Lenovo Z460 which has a Samsung 2GB PC3-8500 DDR3 1066MHz RAM in one of the slots. I'm going for an upgradation. But the thing is, i find it very hard to get a 8500 - 1066MHz RAM.

So will it be ok if go for the next higher configuration RAM.say. 10600 - 1333MHz. Anyway it will run @ 1066MHz, rite…

And… I've referred the user's manual & it says…

Bus architecture - Hyper Transport Link 16 x 16
- A link Express 2
- DDRIII 800~1333MHz
- PCI-Express x 16

DDR III 800/1066MHz DIMM socket x 2 (max 4GB per slot)

Does this mean. Do i have to stick with 1066MHz RAM?

Grateful to any sort of help.

RAM speed is backwards compatible. You can safely buy 1333MHz speed ram.