uh.. does itx mean its not the OC version? here's mine https://ibb.co/bYwPtQ i think we're the same because i did not see him mention that he has a 6 pin
it think it's alright. because accdng to buriedone (https://www.youtube.com/watch?v=JKM60VVIfRg&t=542s)
 it doesnt matter if its 400 or 500 series. what matters for bios modding is you have the same memory type and memory size as stated in 2:06 to 2:10
so yeah, i think you'll be fine. just have a backup file of your original bios.