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monster_trucktoday at 4:47 AM2 repliesview on HN

The extra cache doesn't do a damn thing (maybe +2%)

The lower leakage currents at lower voltages allowed them to implement a far more aggressive clock curve from the factory. That's where the higher allcore clock comes from (+30W TDP)

I'm not complaining at all, I think this is an excellent way to leverage binning to sell leftover cache.

Though if I may complain, Ars used to actually write about such things in their articles instead of speculate in a way that suspiciously resembles what an AI would write.


Replies

Aurornistoday at 5:19 AM

> The extra cache doesn't do a damn thing (maybe +2%)

It depends on the task. For some memory-bound tasks the extra cache is very helpful. For CFD and other simulation workloads the benefits are huge.

For other tasks it doesn't help at all.

If someone wants a simple gaming CPU or general purpose CPU they don't need to spend the money for this. They don't need the 16-core CPU at all. The 9850X3D is a better buy for most users who aren't frequently doing a lot of highly parallel work

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EnPissanttoday at 5:19 AM

It's very workload dependent. It certainly does more than 2% on many workloads.

See https://www.phoronix.com/review/amd-ryzen-9-9950x3d-linux/10

> Here is the side-by-side of the Ryzen 9 9950X vs. 9950X3D for showing the areas where 3D V-Cache really is helpful:

Coincidentally, it looks they filtered to all benchmarks with differences greater than 2%. The biggest speedup is 58.1%, and that's just 3d vcache on half the chip.

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