Worth pointing out that you "only" get <= 270GB/s of memory bandwith with those Macs, unless you choose the max/ultra models.

If that is enough for your use case, it may make sense to wait 2 months and get a Ryzen AI Max+ 395 APU, which will have the same memory bandwith, but allows for up to 128GB RAM. For probably ~half the Mac's price.

Usual AMD driver disclaimer applies, but then again inference is most often way easier to get running than training.