you need to look at your motherboard's specs to see how much ram it could suppor and the maxium speed. i guess 1 gig is find and for the speed since it has 2700 why not just get 2700 also but for acurate speed refer to the mobo spec.
If you're looking for a specific stick then find your lappy on www.crucial.com, they'll show you what will work with your system and it's guarenteed. Usually you can also find the ram you need and buy it from Newegg for cheaper.