I checked the cpu which did have a bent pin, carefully bent it back reseated the cpu and now all my slots work. Thank you for your help!
Glad you got it fixed
You can run in dual channel with 4 sticks at 1333 Mhz , but if they are double sided ones and all memory controllers banks are taken you may not have a proper experience stability wise so you may have the need to drop to 1066 Mhz when all slots are taken.
Also if the 4 modules are not factory paired the probability to have issues is even bigger.
AMD CPU memory controller is a little nasty in some memory combinations.
Run dual channel ,run matched pair of 2 to be on the safe side.
Enjoy your system.