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Re: iMac Pro thoughts

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Joe Marler
Re: iMac Pro thoughts
on Jun 13, 2018 at 8:54:02 pm

[Oliver Peters] "if the main concern is rendering/exporting within an NLE like FCPX or Premiere Pro, then the iMac Pros will still yield superior results. Although we are mainly talking about a 10-20% bump for the iMP over a decked out iMac."

This will vary based on the codec and NLE. Some common workflows in FCPX are significantly slower on a 10-core Vega 64 iMac Pro than a top-spec 2017 iMac. I ran these tests yesterday:

Export from 4k Sony XAVC-S, clip length = 10:17

Output = 4k H264 Fast Encode, 2017 iMac 27 = 5:53, 10-core Vega 64 iMac Pro = 7:10
Output = 4k H264 Better Quality, 2017 iMac 27 = 11:25, 10-core Vega 64 iMac Pro = 14:49
Output = 1080p H264 Fast Encode, 2017 iMac 27 = 5:53, 10-core Vega 64 iMac Pro = 4:00

So at least the iMac Pro is faster at encoding to a 1080p H264 file, but it's slower than a 2017 iMac at encoding to a 4k H264 file. FCPX on the iMac Pro is also slower than the 2017 iMac on the H264 decode side, not just encode. This can be seen by how scrubbing an H264 4k timeline is more sluggish on the iMP than the iMac. The iMac Pro is faster at encoding and decoding ProRes.

In Premiere 2018, the iMac Pro is faster than the 2017 iMac at all the H264 encoding tests I've done.


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