Just to be sure, which of the following 980 Ti models have the reference pcb design?
EVGA GeForce GTX 980 Ti (06G-P4-4990-KR)
EVGA GeForce GTX 980 Ti ACX 2.0+ (06G-P4-4991-KR)
EVGA GeForce GTX 980 Ti Superclocked (06G-P4-4992-KR)
EVGA GeForce GTX 980 Ti Superclocked ACX 2.0+ (06G-P4-4993-KR)
EVGA GeForce GTX 980 Ti Superclocked+ ACX 2.0+ (06G-P4-4995-KR)
EVGA GeForce GTX 980 Ti Classified ACX 2.0+ (06G-P4-4998-KR)