I'm upgrading my aging NAS hardware to something more recent, and I've decided that I will either buy an i5-7500 (3.4 base, 3.8 boost, 65W) or an i5-7500T (2.7 base, 3.3 boost, 35W). Given that the two CPUs are so similar in price, I don't want to miss out on potential performance, but right now I am more keenly interested in lower energy consumption.
1) Will the CPUs use similar amounts of energy when at low utilization?
2) Can I underclock the i5-7500?
3) Would that achieve a similar power consumption to the i5-7500T?