than leave every thing on AUTO!
Just put a small fan blowing across the ram for now and test it.... 2.2v is really nothing if you keep them cool... the 790 chipset is really limiting when it comes to memory, I found that out when I got the CH4 890 mobo, a difference between night n day
your running UNGANGED right? if you dont like the idea of doing what we sugest than Gang the memory and run your mem bench, it is faster ganged but for photo shop im not sure if it will rather like the memory unganged or not.. and the below pix of the Vipers..... dont worrie you wont hurt em