Optiplex 790 upgrade help

Hello. i just got a OptiPlex 790 with the quad core i5 3.1ghz processor.....it came with 8gb ram and a 250gb hard drive.......my questions is this computers ram is limited to 16gb correct? and can the 1333mhz speed be overclocked if i get ram that can do it? this is the ram i was looking at. will it work?

next is the video card. whats the best i can put in this computer. i know im limited because of the size....not sure the model it is out the few but its not the ultra mini.


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