I'm a bit useless when it comes to things like this
I have a 295x2 card, I've noticed after looking at MSI after burner and GPU-z
that the second core on my card, the memory core keeps jumping from 1250 down to 150 Mhz
the first card uses 24% fan speed whilst the second card is using 100% of the fan speed
Should the card be jumping like that on the Mhz?