In most cases, a single GTX 1080 is going to be faster than any dual GPU configuration (with the exception of RED 6K where you would need a Titan X to match the performance of two GTX 1070/1080 video cards). What is really interesting here is that if you compare these results to the results from our single GPU test in the previous section, it becomes clear that we are definitely hitting some sort of bottleneck that is preventing the workstation from exporting any faster. Even then, even the GTX 1070 was able to match the GTX 1080 or Titan X. This time, the only time we saw an advantage to using more power cards was when exporting RED 6K footage to H.264 1080p. With two video cards, our results are quite a bit different than what we saw with a single GPU.
PREMIERE PRO MAC GPU CARDS 1080P
While these two tests did not show a benefit to using a Titan X, Exporting RED 6K footage to 1080p did show a pretty significant decrease in export times when using a Titan X. If you work with H.264 or CineForm 4K footage and export to 1080p, there is a definitely an increase in performance by using a GTX 1070, and a further increase by using a GTX 1080. However, there were three times where you would notice the difference with a more powerful video card. Others (ProRes 4K) showed some minor differences, but they were only minor and not consistent - the more powerful cards were sometimes slower than the less powerful cards. In some instances (H.264 1080p, CineForm 1080p, and RED 4K) we saw essentially no difference between any of the cards we tested. Right off the bat, we are getting some very interesting results.
PREMIERE PRO MAC GPU CARDS PRO
Because of this, we thought we would start our testing by looking at how Premiere Pro is able to utilize a single GPU when exporting from a variety of resolutions and codecs to H.264 1080p: While more and more people are starting to shoot in 4K and higher resolutions, 1080p is still by far the most common resolution to export to.
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