Kinvermark wrote on 10/26/2018, 12:22 AM



bitman wrote on 10/26/2018, 4:10 AM

Maybe only 16 ?

see the note in the article by Guru 3D,15.html



Current system: VP 18 (build 284), VP 17 (build 452), (uninstalled VP 12,13,14,15, 16 Suite), Vegasaur, Magix Video Pro X (VPX11), Corel VS ultimate 2019, a lot of NEWBLUE plugins, Titler Pro 6, Mercalli 4.0, Respeedr, Vasco Da Gamma 12, VASST stuff, Production Assistent pro3, Boris Continuum 2020, Davinci Resolve Studio 16,...

  • OS: Windows 10 Pro 64, version 2004
  • CPU: i9900K stepping R0 (since October 2019), previously, der8auer i7-8700K (advanced edition), default speed (no overclock), Cooler: Noctua NH-D15s
  • RAM: G.Skill Trident Z 3200C14 DDR4 64GB, XMP set to profile 1 in BIOS
  • Videocard: NVIDEA RTX 2080Ti (Founders edition), NVIDEA studio drivers
  • Monitor: LG 38 inch ultra-wide (21x9) - Resolution: 3840x1600
  • C-drive (games & APPS): Samsung NVMe SSD 2TB 960 pro

  • Current Video source work drive: Samsung NVMe SSD 2T 970 EVO plus

  • Mass Data storage & Backup: WD gold 6TB + WD Yellow 4TB

  • MOBO: Gigabyte Z370 Aorus Gaming 7, BIOS F14
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Stiven wrote on 10/26/2018, 3:47 PM

Hah crap. My CPU has 18 cores and 36 threads.

Is there a reason why it is capped ?

Kinvermark wrote on 10/26/2018, 6:41 PM

Not capped, just (maybe) not written to take advantage of these brand new processors. It's not "automagically" scalable you know.

How many cores Vegas uses effectively in practice is not an easy question to answer. You would need to test performance versus the "same" processor with less cores in a variety of situations. Without that testing I will guess 32 threads as this is what is shown in the Vegas 16 preferences. The Guru3D article only seems to have looked at one aspect (UHD render) and IIRC a Techgage article claimed the opposite. So who knows.

astar wrote on 10/26/2018, 8:42 PM

Why do people think Vegas is limited to 16 threads? I think that comes from some setting under the preferences for render threads. There are more threads the system uses for other tasks.

I have seen Vegas use over 70 threads, you can verify this under task manager by adding thread count to the columns. Windows controls how the CPU threads are utilized.

If the render engine used all the threads while rendering, your GUI would not be responsive.

Kinvermark wrote on 10/26/2018, 8:52 PM

The setting is in the video preferences section. 16 for Vegas 14, etc. 32 for Vegas 16.

Personally, I don't worry about the "engine" details like that; just want to know what makes it go faster :)

Stiven wrote on 10/26/2018, 8:55 PM

Ah it does utilize all, I switch the limit from 32 to 36 threads in options.

astar wrote on 10/26/2018, 8:59 PM

In another thread, someone posts a link to a Vegas review of processors.

So granted there are improvements in memory architecture and bandwidth, and other system elements. But the graph does basically show how more threads helps improve render times. The bottom CPU is what 4 cores/8 threads and the top is 16 cores/32 threads.

What is not shown in the review are the details on each of the test systems. I find it hard to believe that each of the processors had identical ram quantities given the vintage of some the test machines. The 2600K might have had maybe 8-16GB of ram, while the 2950x could easily have a lot more due to the amount of memory channels.