Yep, the spike in the green line was from a previous screenshot i took but this one came out better so i chose this one.
As for my gpu core temps they're normally matched but i alt tabbed out before i took the screenshots to change the quality in afterburner, hence gpu 1 is a few C hotter than gpu 2 as once you alt tab gpu 2 goes into idle clocks. Regarding the temp i use auto fan so the card remains quiet under load. Temps go to about 80-84c with vsync off. I could run the fan faster to keep temps much lower if i wanted but i don't see the point as 7990's are fine up to 90c. Vrms are usually about 5c lower than core temps.
Regarding what the graph means this picture will explain better than i can. The commands listed don't work in BF4, they've changed but the principle is the same.