2012 iMac - Sporadic Kernel Panics


i'm trying diagnose sporadic kernel panics late 2012 imac fusion drive. typically happens when machine has been left running awhile. return find has shut down. upon rebooting, i'm shown following screen.

http://imgur.com/7hqlzbq

not sure start, or how diagnose problem.
 

is 27" imac?
if so, have added ram?
if so, have tried taking replacement ram -out-, , re-installing factory-original ram?
 


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