Hi Danuts
🙂3rd and 4th gen refers to the mainstream desktop processors. 4820K is an IB-E chip made for LGA2011 socket...X79. That platform is quad channel RAM and while it will run the RAM you are looking at, that kit is dual channel only. X79 you don't want to combine RAM kits even of "same" make and model.
Third gen processor like 3770K
Fourth gen processor like 4770K or 4790K want Z87/Z97 chipset. 4790K with Z97 board like maximus Vii formula would be good gaming machine.
X79 board like Rampage IV Black edition and 4820K would be good gamer and good video editor etc...
Though really there is not much between those two...