First photo is LM, second is PTM. Just a quick post to show my results. All settings exactly the same between these runs. Both runs were 5 minutes and I calculated temps via delta between water and cpu ccd. Scores were negligible difference.
Interesting that ptm7950 is less than 10c higher. Honestly might stick with ptm7950 given it lasts basically forever. I allowed it to heat up once to 80c then tightened a little more. Will probably do this when I can get my hands on a 9850x3d.