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Question [Phoronix] Ryzen 9 3900X vs. Ryzen 9 3950X vs. Core i9 9900KS In Nearly 150 Benchmarks (Linux)

DrMrLordX

Lifer
Apr 27, 2000
16,352
5,266
136
Interesting. Usually the Phoronix test suite is biased enough towards ST performance that higher-core-count options don't shine all that much.
 

Makaveli

Diamond Member
Feb 8, 2002
4,100
178
106
Viewing the graph for some reason or another I picture the center as a wagon train surrounded by hostile Indians....Maybe because AMD is the red team?
When invading someone's land you would be hostile too :)

I found the review to be good and nice to see non windows testing. And the 3900X winning some of the benches due to clock speed was also a surprise.
 

Atari2600

Golden Member
Nov 22, 2016
1,215
1,324
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The variability of performance between 3900X and 3950X is a bit surprising - and somewhat concerning given the very consistent advantage the 3950X is plotted up to hold over 9900KS.


I didn't really see an explanation why - which would leave me wondering what caused it. Some mix of throttling & Ahmdal? Or Silicon lottery? Or was it test procedure?
 

DrMrLordX

Lifer
Apr 27, 2000
16,352
5,266
136
I didn't really see an explanation why
A 3900x can sustain clocks north of 4 GHz on "real world" workloads that have 24t or more. A 3950x will (sometimes) downclock as far as 3.5 GHz, though I don't have one on-hand to test. Theoretically, if a 3950x downclocked to 3.5 GHz on a 24t workload, the 3900x would be faster. Boost algorithms should make that impossible, but as we all know, AMD's boost algorithms took a long time to "get right" via AGESA updates. The 3950x may still need some work.
 

Topweasel

Diamond Member
Oct 19, 2000
5,327
1,525
136
Yeah, I would have also expected the 3900X to be a smooth curve, like the 3950X.
The 3900x has a more boost range. It doesn't cap power limits til 10 cores and 12 cores is still within 10-20w of that. Means it has large range in boost behavior from 8-12 core loads (and as someone mentioned can maintain for some time a 4GHz boost all core). Due the extra power usuage of 33% more cores the 3950x starts balancing clocks and sustaining performance much earlier in the process which I think causes it to maintain a more uniform profile.
 

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