I believe that socket 478p's that could possible be swapped in include the t5xxx, t7xxx, t8xxx, t9xxx, and the q9xxx series intel chips. However, if you do so, the higher performing chips may require more power and your MOBO/PSU may not be able to support it.
I don't recommend doing so, but here is a list of processor benchmarks:
http/www.notebookcheck.net/Mobile-Processors-Benchmarklist.2436.0.html
I believe that socket 478p's that could possible be swapped in include the t5xxx, t7xxx, t8xxx, t9xxx, and the q9xxx series intel chips. However, if you do so, the higher performing chips may require more power and your MOBO/PSU may not be able to support it.[/b]
That being said allow me to interject. The Socket 478P as BUWISH states will accommodate nearly the entire T(XXXX) Line. to Include Centrino, Celeron, Pentium and Core 2 Duo in the T4xxxx through T9xxxx range. The catch here when looking for a Drop n' Swap processor is to pay attention to the Thermal Design Power (TDP) rating. At quick glance at ARK I see the TDP on pretty much all 478P processors is 35W. Your min. charger/PSU will be rated for 65W. As such the TXXX line socket 478P was a durable, flexible and seriously upgradeable lineup and dominated the laptop processor market for a few great years. The Core I(x) lineup isn't bad but Intel's getting away from upgradeablilty with LGA (line grid array) processors mounted directly to mainboards...low voltage...high performance...etc you know the routine. All about the bottom line NOTE: I still frequently use my Inspiron 1545 which is a 478P board and a T4200 Pentium 2 thread...nice lappy!