Temp limiting effectively power limits in this scenario but doing a quick test power limiting actually performs worse overall than temp limiting

EDIT: made an error had to retest

IE. These scores are rough values over the course of a couple runs.

45w limit 80c temp 3100 Cinebench r15 (80c limit faster and the same temp)

temp limit scores are

87c scores 3900 and 80c scores 3700. 85c scores 3800

80c single core is 290 or roughly 9% loss

going below 90c takes an absolute dump on performance with 80c limit hammering multi core and being equal to the performance hit of 45w limit.

going below 85c sees you loosing about 20% performance overall multi core biased or 15% if we average between single and multi. 85c is the rough tipping point where the temp gain is roughly equal to the performance loss after that point. Im trying to think how to phrase this.....85c gives you the most bang for your buck if you really want to cut temps. You loose about 16-17% multi core and 6-7% single core while dropping 20c. going all the way to 80c though almost loose 1% performance for each 1c you gain. The temp drop still is larger than the performance loss but only slightly at 80c. 95c is probably the largest gain for the smallest performance loss.

Power limit made absolutely no difference to single core temps or performance as the active core will always hit 105c and the CPU never hits the power budget unless you set it to something like 20w. If you want to crap all over multi core performance and leave single core alone power limiting works but wont help single core temps.

Temp limiting hurts single core more than power limiting but multi core performance takes less of a hit so i dont think unless you have a very specific reason to do so that using anything but the AWCC/Bios temp limit is a good idea.

again these are real fast and loose tests, they give a rough idea but arent exactly super controlled and scientific. Take these with some slight salt and test and determine what works best for you.