Memory N00b needs help

Hellooooooooooo World...

So recently I purchased a [laptop] Lenovo B560 knowing full well that 2GB of RAM would have to be updated. I'll include the user manual at the bottom. So what I was wondering is that currently there is a 1066 DDR3 SD RAM 2GB stick in there with an open slot. I know the computer can handle 8GB of RAM total and that each slot has a max of 4GB. My question is what kinds of memory can I purchase? More precisely,

1) Can I purchase a 1333 DDR3 SDRAM 4GB stick? (does 1066mhz matter here?)
2) Can I purchase a 1333 DDR3 SO-DIMM RAM 4GB stick? (ie what is the difference between SDRAM and SO-DIMM?)

I don't really know my option and I'd appreciate some practical user expertise here. Thanks for your time!

HAUNTMEE

User Manual link

1) Probably not - the larger sticks (not marked 'SO-DIMM') won't fit. They're about three times too big.

2) That sounds about right. SO-DIMM indicates that it's a smaller format. I attached a photo of some older modules for comparison (thanks Google image search!).

Anything in this range (DDR3 SODIMM) will physically fit. http://www.newegg.com/Product/Produ...00006178&IsNodeId=1&name=204-Pin DDR3 SO-DIMM Additionally, your laptop specifies PC3-10600 RAM, which indicates the speed the RAM should be rated for.

Here's the kit I would pick if I was in your shoes:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820139482

Or, if you want just one stick:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820139190

Thank you for the reply - So does the speed actually matter? Also, the picture shows the difference between DIMM and SODIMM - your reply seems to suggest that SDRAM is DIMM memory... is this always true?

'SDRAM' is a specification, I believe. Just about every type of memory out there is SDRAM. http://en.wikipedia.org/wiki/Synchronous_dynamic_random-access_memory Some old Pentium 4 platforms used to use RDRAM, which was different and rather rare. The word still gets thrown into all memory descriptions for some reason.

DIMM vs SODIMM is a question of format, where SODIMM is the Small Outline version of a Dual In-line Memory Module. Lots of acronyms flying around. Laptops and some other small format computers use SODIMM memory.

The speed matters up to a point. Your laptop has a specification for how fast memory should run, sort of like a speed limit. The memory you buy needs to be able to go that speed or faster. Slower memory won't work and the computer may be unstable or not boot. Faster memory will work, but your computer won't take advantage of it; it will 'clock it down' it to run at the normal speed. Faster memory is usually more expensive.

Okay I think I got it - going to order some memory online and see how it goes. Thanks for your help!