Új hozzászólás Aktív témák

• #2459 S_x96x_S addikt Petykemano #2457

  Új Válasz 2020-01-17 06:21:49 #2459

  Új hozzászólás

  Összes hozzászólása itt Válaszok az összes hozzászólására itt Válaszok erre a hozzászólásra

  Privát üzenet küldése

  

  S_x96x_S

  addikt

  válasz Petykemano #2457 üzenetére

  lehet, hogy a " 12 - 18 month cadence" ... -ből a 18 hó
  .. ezt a csúszást jelenti .. sokszor kommunikálják ...
  és valószínűleg nem véletlenül.

  --------------

  Érdekesség - friss (tomshardware) AMD -s Hallock interjú
  Talking Threadripper 3990X With AMD's Robert Hallock
  főleg skálázási problémák, és szűk keresztmetszetek a téma
  a 64 magos TR-el .
  Mivel szerintük 4 csatornás memória sávszél annyira nem korlátozó, valószínűleg emiatt nem lett TRX80 -as alaplap ..

  " core count from 32 to 64 doesn't result in doubled performance. Even in the scaling-friendly Cinebench tests that AMD shared, we can see that performance only increases ~48%. "

  "Hallock doesn't see memory throughput as a limitation in the majority of workloads, but told us that memory capacity per core is actually one of the biggest challenges. As a result, Hallock said that compile workloads require a bare minimum of 1GB per core (64GB total), and that 2GB (128GB total) is better. That means you'll need to budget in a beefy memory kit for a 3990X build. "
  ...
  "We don't see a lot of memory bandwidth starvation with 64 cores," Hallock explained, though he did specify that some simulation work, like DigiCortex, is faster with more memory throughput. However, most workloads are fine and Hallock feels that concerns about memory throughput are largely a legacy impression, and that DDR4 memory provides plenty of throughput with relatively few channels. AMD has also made architectural decisions to keep data on-chip, like an almost unthinkable 288MB of total cache, a third AGU (Address Generation Unit), and larger opcaches, among other changes, that help keep data in the caches to overcome memory bandwidth challenges.

  Workload intensity is another factor that limits scaling, with small compile jobs like the Linux kernel or PHP suffering because the jobs simply run so fast they can't unleash the full power of the cores, while heavier jobs, like compiling Android or the Unreal Engine, are stringent enough over a long period of time to fully exercise the cores.

  Those same concepts apply to video encoding: For instance, 8K HEVC encoding scales much better than H.264. Hallock says you can expect a 60% to 70% increase in rendering performance when doubling the core count, and noted that if your render jobs take half an hour, the 3990X probably isn't for you. However, if you measure your render time in hours per frame, the 3990X makes a lot of sense. Rendering is obviously one of the key target applications for the 3990X, so we'll certainly spin up 8K HEVC testing for our upcoming review"

  Threadripper 3990X Overclocking

  "Hallock said a 64GB should overclock to DDR4-3600 fairly easily, while performance with 128GB kits will vary. As expected, it's safe to say you'll see extremely limited overclocking, if any, with 256GB kits. In either case, we don't think most users that drop $4,000 on a processor are particularly focused on overclocking. "

  ....

Új hozzászólás Aktív témák