It does fine on 1080p, but for my taste it's just not fast enough on 4k without using proxy files, except in limited situations for small single-camera clips.
I edit lots of 4k every day on my 2015 top-spec iMac 27 using both FCPX and Premiere CC. A higher-end Mac Pro or powerful Windows workstation might be able to avoid that but not an iMac. The bottom line is if you want fluid, responsive H264 4k editing you generally need to use proxy files - whether on Premiere CC or FCPX.
Effects can often (but not always) be GPU-accelerated, but this does not remove the CPU load from H264 encode/decode - it just adds another burden. GPUs by themselves cannot meaningfully accelerate H264 encode/decode, so import, export and scrubbing the timeline is mostly a CPU-oriented task if no effects are used. Even FCPX can struggle with this on a top-spec 2015 iMac 27, and it uses hardware accelerated Quick Sync on Sandy Bridge and later Intel CPUs (excluding Xeon). It is an incredible load on any editing machine. The problem is H264 4k is four times the data of 1080p. Naaaa, I like the simplicity of sticking with camera files, but it's nice to know the option is there for proxies.Plus I want that new 5K screen after using a cheap monitor for 2 years and an average laptop.Just been to look and torn between the one in 1st post (£1600) and upgrading to i7 and the next step up graphics card (M395 with 2GB) for £500 extra. So excited to get back on the iMac train with a 5K 27" screen I currently have a standard 1TB hard drive, i7 2.7GHZ, 2GB 960M graphics card, 16GB RAM (Windows 10), so I appreciate rendering will be slow- just wondering if any specific tweaks will make a big difference like either better GPU or SSD or i7 for example?ĨGB (two 4GB) memory, configurable up to 32GB (I will add an extra 16GB myself) Will be just using footage in UHD from G7 and GH4 recorded at 100Mbps (but likely to get the GH5 next year). Anyone have any real world experience with the same or similar specced iMac? Is it enough for 4K editing pretty basic timelines exporting as HD H.264 at 9 bitrate, 4K at 25 bitrate, and 4K H.265 at 13 bitrate: on MP4. I have seen this one almost half the price of the top spec one and it looks good enough to me on paper. Finally settling down for a while so jumping on the chance to get another iMac.
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