help,please! newbie question for memory upgrade of sony s460p,

hi, everyone
great thanks for reading my post

I have a sony s460p notebook. I'm thinking to upgrade its memory.
I got out the memory of my sony vaio s460p laptop. the sticker on the surface of the memory says " Samsung , 256MB 1Rx16 PC2-3200s-333-10-C1" (looks very similar to this pic: http://i14.ebayimg.com/02/i/08/07/19/67_1_b.JPG).
pic:


The one I am thinking to buy having a label says " 1GB 128x64 PC2-3200 ICXX321/64x8-0" It's a DDR2-400 module, from All4Memory. Here's the link to the product website:
http://www.4allmemory.com/index.cfm?
fuseaction=search.memorySearch&model_id=-6076&memory_id
=-55939
link:
http://www.4allmemory.com/index.cfm?fuseaction=search.memorySearch&model_id=-6076&memory_id=-55939

Is this 1GB memory compatible to the memory I have now, as you know, I am thinking to use one of my original 256MB memory together with this 1GB memory. looks like they are all PC2-3200, but my memory is PC2-3200s (one extra s). so, what do you guys think? your suggestion will be highly appreciated!! thanks and bow!!

 

can anybody help me out? thanks