What can Linux Do for an old laptop, Laptops compared.

We had done this because I had just fixed some up, shows tech through the years. Dell inspiron E1505 Specs (Intel Core Duo T2500 - ATI Radeon X1400 - 2GB DDR2 533mhz Ram - 250GB HDD - 15.4in 1680 by 1050 Screen) Lenovo ThinkPad T520 Specs (Intel Core I7 2760QM - NVIDIA NVS 4200M - 8GB DDR3 1333mhz RAM - 1TB HDD - 15.6in 1600 by 900 Screen) Dell Inspiron 3542 Specs (Intel Core I3 5005U - Intel HD Graphics 5500 - 4GB DDR3 1600mhz RAM - 1TB HDD - 15.6in 1366 by 768 Screen)