Asus gtx 760 throttling?

Arcanine300

Honorable
Oct 30, 2013
164
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10,760
So i had this card for awhile now and i wanted to overclock so i opened up msi kombuster to get a reading for my stock temps. My temps were only at max 67C and i noticed every so often my load would go from 91-92% and for a split second to 67-72%. I have never seen this happen. It seems like the card is throttling but i don't know. any ideas? Also its only using 65% of its tdp.
 

Arcanine300

Honorable
Oct 30, 2013
164
0
10,760


no notcible fps drop and my other specs are:
cpu :fx 4100
mobo: msi 970a-g46
psu: corsair hx 650
ram: corsair vengence pro 18gb 1866mhz