what cpu can i put in a socket PGA478

[lildoode]

what cpu can i put in a socket PGA478 i currenlty have a intel celeron 900 i want to put a dual core cpu in my acer extensa 5235 but i don't know wich one to put in or which will fit my socket and improve my laptops performance

 

[logainofhades]

http://panam.acer.com/acerpanam/notebook/2009/acer/extensa/Extensa5235/Extensa5235sp2.shtml