CREATE TABLE table_name_71 (voltage VARCHAR(255), turbo VARCHAR(255), cores VARCHAR(255), release_date VARCHAR(255))
What is the voltage when there are 2 cores, turbo is 5/8 and the release date is September 2010?
    
SQL: SELECT voltage FROM table_name_71 WHERE cores = "2" AND release_date = "september 2010" AND turbo = "5/8"