AMD Threadripper 3990X's 64 cores promise monster rendering

Post by g4omingron » Mon, Nov 25, 2019, 9:10 PM UTC

jowdones wrote: post #6

c2h5oh wrote: post #3

Earlier quoted context omitted.

That's about 3960X and 3970X, which are the 24 and 32 core CPUs that had their benchmarks released today. Post is about a 64 core part that launches next year.

Core count is becoming more and more bullshit. If I get performance X using 1 core and Y using all cores, then true core count is Y / X, regardless of what advertised CPU count the manufacturer may dream. Geekbench scores: ----------------- Intel Core i7-8086K: 6288 single core, 29927 multicore, asvertised cores: 6, real cores: 4.75, bullshit factor (advertised/real): 125%. Decent. AMD Ryzen Threadripper 3970X: 5838…

So your "true core count" for the entire Summit supercomputer will be one if you run Dijkstra's SSSP on it?

What is the bullshit factor for your "true core count"?

Post by lliamander » Wed, Nov 27, 2019, 8:23 PM UTC

eatmyshorts wrote: post #9

chapplap wrote: post #7

Earlier quoted context omitted.

This just means Geekbench isn't good at scaling to multiple cores. It could be the workload or the implementation. If you have the right workload and a good implementation, modern processors do scale reasonably well (all numbers with Threadripper 3970X): Cinebench R15: 206 single, 7302 multi, 35.4x scaling POV-Ray: 9:02 single, 0:19 multi, 28.5x scaling The scaling can be greater than the number of physical cores due…

Or they demonstrate that the CPU is throttling cores due to excessive heat. Compare the 24-core 3960x to the 32-core 3970x, and also look at the power consumed when running cores at 100% utilization. It would appear that the 3970x starts throttling the cores once ~21-22 cores are in full utilization, leading the 3970x to be only marginally faster than the 3960x, even though it has 50% more cores. EDIT: 3970x has a Ge…

> Meanwhile, power consumption per core starts dropping off significantly at 21 cores for both

Which you would expect with so many cores. Power consumption per core is probably going to be even lower for the 3990X, especially considering it has the same TDP.

Re: AMD Threadripper 3990X's 64 cores promise monster rendering

Re: AMD Threadripper 3990X's 64 cores promise monster rendering