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Premiere Pro hardware considerations with H.264 and HEVC footage
If you deal with a lot of H.264 or HEVC footage, it might be wise to get a computer which features Intel CPUs that support Quick Sync technology. Quick Sync can be a boon to both performance during editing (while decoding) and also for faster exporting times (when encoding). That's a powerful advantage for short form H.264 editors that simply do not have the time to transcode or create proxies.
At first, AMD CPUs were more suited to non-H.264 workflows, like ProRes, when editing with Premiere Pro. Nowadays, these CPUs are fine for H.264 and HEVC editing, though, now that GPU decoding and encoding is now available.
As of Premiere Pro 14.2, and later, most modern GPUs support hardware accelerated encoding for H.264 or HEVC in both Windows and macOS systems. Hardware accelerated encoding reduces the time it takes to export either a H.264 or HEVC file. For guidance on hardware requirements for this feature, see system requirements.
As of Premiere Pro 14.5, and later, GPU hardware accelerated decoding in H.264 or HEVC is also supported further accelerating performance of these formats, especially for playback.
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Pretty sure Quick Sync is turned off when a better video card is used. It is on mine because playback on the timeline is choppier.
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Actually, the discrete GPU is selected as the hardware decoder by default when the "better" GPU is installed. You may opt to manually change the decoder to the Intel decoder in the Media settings when you launch Premiere Pro.