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dhuting
Participant
January 25, 2019
Question

$12,000 18-Core iMac Pro SLOWER than Base Model w/ Premiere CC

  • January 25, 2019
  • 3 replies
  • 2213 views

Hey guys, just wanted to report a very interesting yet also frustrating finding.


I just recently purchased an 18-Core iMac Pro with the 2.3GHz Intel Xeon W and 128GB 2666 MHZ RAM and the Radeon Pro Vega 64 Graphics card, expecting it to be a beast with video editing on Premiere Pro.  Its benchmark score was more than 50,000 with GeekBench...so upon turning on the computer I only installed Premiere Pro CC and began a typical edit, which involved some H.264 100-bit files from the Mavic 2 Pro.

What I have experienced is that when compared to the $5,000 Base-model iMac Pro 6-core I have, is that the performance is not any faster, but in fact is SLOWER in rendering!! How does this make sense?

For example, I am currently looking at 30 hours to render less than 1 hour of H.264 footage which was color corrected and stabilized with Warp Stabilizer.

My question is, how is this even possible? Clearly Adobe has not prepped their software to take advantage of the extra cores OR the extra Ram.

Please advise.

Returning the computer to Apple thankfully as its within the 14 day return period.  Considering ditching Premiere Pro due to all of the hassles with it locking up and freezing on iMac Pros, but that is a different thread and story altogether.

Screenshot of Media Encoder showing 20+ hours remaining + 11 hours elapsed all just to render one 54 minute reel of H.264 footage with warp stabilizer applied:


GEEKBENCH screenshot:

This topic has been closed for replies.

3 replies

Mo Moolla
Mo Moolla
Legend
January 28, 2019

The Mac you have is a decently specced machine BUT what you didn't take into account is that the number of cores is less important than the processor speed.

So many end users make this mistake its crazy.

Your iMac is set up to get the best out of software that supports multithread processing i.e.. parallel processing.

Premiere, AE etc do not run instructions in parallel. They move along a que system much like a conveyor belt. So instructions go to the RAM and then to the CPU "ONE AFTER THE OTHER".

So even if you had 50 cores it won't matter.

A faster single core processor will outperform a multicore Mac any day in Premiere and AE.

Unfortunately you will need to wait until Adobe decides to optimize their software for multithread ability but I don't know when or if this will ever happen.

So for now I am afraid the only way to get more speed is to...well theres real not much more you can do besides roll back to High Sierra if you are in that horrible Mojave OS.

Mo

    allanc41645757
    allanc41645757
    Participant
    July 23, 2019

    We found the same thing, its why we had to move the whole team to Final Cut Pro on Mac OS. its at least 10x as fast. We don't exaggerate. Its Adobes fault for not optimising their software. Same with even Adobe Photoshop, although in 2019 any modern processor can power through picture editing without a problem.

    We have three iMac Pro's 18 cores, and we can scrub edit, native 4k without a hitch. No chance of doing that with Premiere. Final export times are around 5x as fast as well for most of our content.

    I know this isn't a solution for businesses or individuals set into Premiere, but its such a different experience now. Premiere needs a complete overhaul.

    R Neil Haugen
    R Neil Haugen
    Legend
    January 25, 2019

    You bought a $12,000 computer with 18 creepy-crawling cores? Did I read that right ... 2.3Ghz?

    Processing most media especially H.264 in Pr takes a moderately decent number of FAST cores, between 8 and 10. Each with as close as possible to 10GB of RAM per core as possible.

    By fast we're talking 3.8Ghz or better. Many of those cores are probably sitting near idle, and the ones in use aren't working fast enough to max you RAM use either.

    That's a dog. Ship it back!

    Neil

    Everyone's mileage always varies ...
      D
      dhutingAuthor
      Participant
      January 25, 2019

      Thanks for the response.   More like a sick dog - even watching videos on the timeline was jittery (like always) - seriously its mind blowing how the performance is so dull given the specs and price point. 

      Re: processor
      The funny thing this is a $2,400 upgrade - their literal best and most expensive upgrade for the iMac Pro processor:


      Here's a screen grab from the Apple Store configure page showing the +$2,400 upgrade for 18-core - no bigger GHz processor available. What a sham.

      R Neil Haugen
      R Neil Haugen
      Legend
      January 25, 2019

      Their fastest base CPU is only 3.2Ghz? Huh. That's ... sad.

      Especially as we've had comments from Mac folks here that the cabinets are not necessarily setup for massive cooling airflows, so over-clocking is rather risky. I don't really know them well, but ... from first glance, the 14 core IF it could be safely OC'd to say 3.8Ghz would be what I'd look into ... but I know near diddly of Mac details.

      Neil

      Everyone's mileage always varies ...
      M
      Meg The Dog
      Inspiring
      January 25, 2019

      This may be of no help at all, but I'd be curious - if you are willing - can you try an export with the Renderer in Media Encoder set to Software Only?

      MtD

      D
      dhutingAuthor
      Participant
      January 25, 2019

      Thanks for the recommendation; I have switched it live in Media Encoder but so far no change:


      Tried the same with switching it to OpenCL from Metal. Its just slowwwwwwwwly creeping

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