> In terms of actual $/perf, Ampere 192 core is 1.7x better than Turin Dense 196 core based on Phoronix's review.

You're comparing it to the highest MSRP Turin, which doesn't have the highest performance/$. People buy that one if they want to maximize density or performance/watt, where it bests Ampere. If you only care about performance/$ you would look at the lower core count Zen5 (rather than Zen5c) models which have twice the performance/$ of the 192-core 9965.

Doing the same for Ampere doesn't work because their 192-core 3.2GHz model is very nearly already their peak performance/$.