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I wonder how much the silicon quality differs on a single Threadripper Chip. It would really be interesting to see if it's feasible to Overclock the best numa

I wonder how much the silicon quality differs on a single Threadripper Chip. It would really be interesting to see if it's feasible to Overclock the best numa node to a degree that gives this a couple of high single thread performance cores comparable to the 3900X or 3950X while retaining stability overall.

kllrnohj 6y ago
> Overclock the best numa node to a degree Do you mean the best ccx? Or best chiplet? There aren't any numa nodes here, and the cache & memory architecture are already the same as a 3900x. Per-core & per-ccx overclocking does already exist on ryzen though, should work the same on threadripper.
- Roritharr 6y ago
  Interesting, is it already feasible to pin tasks to such OCed cores? It would be interesting to turn the 3990/3995 into a does-it-all chip with best in class single-core performance on certain cores and just lots of a tad slower cores in general.
  - kllrnohj 6y ago
    That's essentially what it's supposed to do out of the box. The chip already communicates to the OS what its "best" and "good" cores are for single- and low-thread count workloads: https://www.anandtech.com/show/15137/amd-clarifies-best-cores-vs-preferred-cores https://www.anandtech.com/show/15137/amd-clarifies-best-core... These are the cores that can turbo the highest. You can attempt to manually OC higher, but that by & large doesn't work without extreme cooling. Typically instead it's about achieving higher all-core frequencies than the built in all-core turbo, typically via higher voltages & power limits (and of course much better-than-stock cooling) Indeed if you look at single-thread cinebench numbers you'll find the 3960x & 3970x right in the middle of the 3700x, 3800x, and 3900x pack: https://www.guru3d.com/articles_pages/amd_ryzen_threadripper_3960x_review,7.html https://www.guru3d.com/articles_pages/amd_ryzen_threadripper... They all hit around that same 4.5ghz single core turbo mark without any overclocking. And Zen2 by & large doesn't really go much beyond 4.5ghz anyway, so there's not all that much manual overclocking you can do without going sub-ambient cooling anyway. The only real downside to Threadripper 3rd gen is the price. It's already a pretty killer jack-of-all-trades CPUs otherwise. It's a very competent gaming CPU without any tweaks at all right out of the box. It doesn't at all have the cons of the 1st & 2nd gen Threadrippers, which were actually NUMA and therefore came with huge gaming downsides.

kllrnohj 6y ago

> Overclock the best numa node to a degree Do you mean the best ccx? Or best chiplet? There aren't any numa nodes here, and the cache & memory architecture are already the same as a 3900x. Per-core & per-ccx overclocking does already exist on ryzen though, should work the same on threadripper.

Roritharr 6y ago
Interesting, is it already feasible to pin tasks to such OCed cores? It would be interesting to turn the 3990/3995 into a does-it-all chip with best in class single-core performance on certain cores and just lots of a tad slower cores in general.
- kllrnohj 6y ago
  That's essentially what it's supposed to do out of the box. The chip already communicates to the OS what its "best" and "good" cores are for single- and low-thread count workloads: https://www.anandtech.com/show/15137/amd-clarifies-best-cores-vs-preferred-cores https://www.anandtech.com/show/15137/amd-clarifies-best-core... These are the cores that can turbo the highest. You can attempt to manually OC higher, but that by & large doesn't work without extreme cooling. Typically instead it's about achieving higher all-core frequencies than the built in all-core turbo, typically via higher voltages & power limits (and of course much better-than-stock cooling) Indeed if you look at single-thread cinebench numbers you'll find the 3960x & 3970x right in the middle of the 3700x, 3800x, and 3900x pack: https://www.guru3d.com/articles_pages/amd_ryzen_threadripper_3960x_review,7.html https://www.guru3d.com/articles_pages/amd_ryzen_threadripper... They all hit around that same 4.5ghz single core turbo mark without any overclocking. And Zen2 by & large doesn't really go much beyond 4.5ghz anyway, so there's not all that much manual overclocking you can do without going sub-ambient cooling anyway. The only real downside to Threadripper 3rd gen is the price. It's already a pretty killer jack-of-all-trades CPUs otherwise. It's a very competent gaming CPU without any tweaks at all right out of the box. It doesn't at all have the cons of the 1st & 2nd gen Threadrippers, which were actually NUMA and therefore came with huge gaming downsides.