We had a modified version of HMTT that can measure the power consumation of a DIMM in real-time at an timing-accuracy of millsecond.

Please see:

Zehan Cui, Yan Zhu, Yungang Bao and Mingyu Chen, “A Fine-grained component-level power measurement method”, The First International Workshop on Power Measurement and Profiling (PMP 2011) in conjunction with IEEE IGCC, 2011.