i have an old toshiba l510 b400, running on pentium t4400. so i decided to upgrade the hardware because i want to run win10 (now running win 7 ultimate sp1). first upgrade is the CPU. my laptop use socket P. and its use gl40 chipset. FSB of GL40 is 800 mt/s. but some websites says this toshiba have 1066 mt/s FSB, and i want to uprade the processor to core 2 duo/extreme, if my laptop can support core 2 quad/quad extreme, i decided to use the quad extreme. so can anyone find me the best processor for my laptop?