To find all the Socket P CPUs available on Newegg simply filter on that socket type.
To find a list of all Socket P (PGA478) CPUs click the following link:http://ark.intel.com/products/family/26548
You need to go to the manufacturer's website to determine what socket p CPU the laptops can use. Just because the CPU can physically fit into the socket does not automatically mean it will work. If the BIOS is not updated to recognize the CPU, the CPU might run at the lowest speed or the laptop may not even get past to post screen.