HP Probook 450 G3 i5-6200U 2.30GHz, 8GB RAM, 256GB SSD, class A-, refurbished, warranty
Open Box: HP Laptop Pavilion Intel Core i5 1st Gen 450M (2.40GHz) 4GB Memory 500GB HDD Intel HD Graphics 15.6" Windows 7 Home Premium 64-bit DV6-3033CL - Newegg.com
How does the Intel Core i5-8250U turbo up to 3.4 GHz with a base clock of 1.6GHz? - Quora