Yes, currently, this feature is only available on a few of the P55 motherboards. This is available as a voltage measure point next to the memory on the edge of the motherboard.
Currently, only these models have the voltage measure point:
EVGA P55 Classified 200 160-LF-E659
EVGA P55 FTW 200 141-LF-E658
EVGA P55 FTW 132-LF-E657
Example from the EVGA P55 Classified 200 (160-LF-E659)
