i think this is the best reply you'll get?

i have an 88w 4790k in my alienware alpha. 55w socket, cooler tuned for that power load.

stock it performed worse than the 4790S, which was the same silicon but tuned to 55w. it generally performed better than the 4790T, the 35w variant of the same silicon. in games it acquitted itself OK, but it was a mess in synthetic benchmarks.

with a custom tune i got it to nominally outperform both chips. it's not surprising since they're the same silicon and i knew the thermal/power limits. i could tune to the limits of the silicon while intel's tune had to account for all their qualifying samples.

applying that information to your question- if the 45w cpu is power/thermally constrained it might not perform any better outside of bursty workloads, but it has the capacity to do so if the rest of the system has the power and thermal management to compensate.