TooLucid

ok, im about to upgrade my cpu to a i7 8700k and was looking at rgb ram, ive came across trident z rgb 3200mhz, but im wondering if its compatible with the i7 8700k even though on intel's website it states its memory type is 2666mhz, and if it is compatible would the ram run at 2666mhz or could i push it to its 3200mhz? Also the mobo i would be using is the ROG STRIX Z370-E

fx 4300, 12gb ddr3 ram, gtx 1060 6gb, 500w psu, the graphics card I upgraded because the one before it was horrible, but all my money went into that.

most of my computer parts from a pre-built I bought about half a year ago are from 2012, I need to upgrade them but I do not have any money, any help on what I should do while I wait before I can get some money to upgrade?