That will depend on the exact make and model of your laptop. You can either go to the manufacturer's website (Advent) and look up the specs, or you can post the model number and someone here will look it up.
They usually can tell you what your board can take.
__________________ My puter:
MOBO - ASUS P5W DH DELUXE
CPU - INTEL Core 2 Duo E6600 Conroe 2.4GHz
VIDEO - EVGA 8800 GTX
MEM - 4 GB (1BGX4) G.SKILL PC2 6400
PSU - CORSAIR 620WATT
HD - 2 SAMSUNG 500GB 7200 RPM
OS - Windows Vista 64Bit
two 1xgig ram sticks will do you very well. you want a name brand value series set of two together. they will be DDR pc3200. 2x1gig. and run you about $165. worth every penny