In today’s user group I asked my peers if they know the difference between the Samsung SSD EVO and PRO - they seem to have the same speeds and reviews. However the PRO version harddrive is double the money - just found this great article explaining it really well - basically the PRO drive gives you double a warranty of 10 years instead of 5 years. So there you have it: http://www.tomshardware.com/answers/id-2632684/samsung-850-evo-850-pro-differences.html