![]() OMG! I am so excited to try out DaVinci resolve rendering of C4K. Your kind advice on how to speed up Blender on my pretty beefy machine, will be greatly appreciated. I already posted on BlackMagic forum what I think about DaVinci not supporting 4K monitors in 2020. But DaVinci resolve menus and toolbars are so tiny on the 4K laptop screen, that it is unusable. I installed DaVinci Resolve because I want to see how fast it can render C4K video. My question is: what am I doing wrong? I can’t believe Blender can only run that slow. Yet Blender can only do 2.6 fps in C4K export from the plain C4K clip, no transitions, no overlaying text, no effects. I can’t find the bottleneck, as all my laptop resources are not fully utilised. I know it’s a lengthy explanation, but it might help others. I also added Disk Caching, and it made no difference in rendering speed.ĬPUs are not throttled, I am also looking at the temperatures monitor while rendering, and I get 80 C - 95C max (mostly 85 C), and watching System Monitor graphs of CPU threads in use, I can see CPUs are not throttled and not even at 25% of the available power. it makes no difference in rendering speeed. ![]() so I don’t think SSD is a bottleneck either.Īnd I experimented with Memory Cache from 0 to 1 GB, 2 GB and 4 GB. NVMe SSD sequential write 1400 MB/s ( 1 frame of C4K resolution is only 8MB, so at 2.6 fps, we are writing only < 24 MB/s to SSD ). RAM is not a bottleneck either, I have only few GB of RAM being used, < 5% in use. When I watch the top software while rendering, it uses only 260% out of available 1200% CPU power, which is effectively only using 16-21% of available CPU power. that makes it 840 seconds to render 2200 frames, 2.6 fps rendering speed. It takes 14 minutes to complete 2200 frames of plain C4K clip export. When I test render C4K 2200 frames (24 fps = 92 seconds of footage with no effects, just plain clip) on Blender, I ran the Phoronix cpu benchmark both on scaling-governor set to: powersave and performance, both had zero throttling, so I believe my undervolting is set to perfect values. all threads 100% for 3.5 hours, without a single throttle. I ran Phoronix benchmarks on pts/cpu and it ran on all cores. ![]() I undervolted the CPU to -115.2mV on CPU Core and CPU Cache -115.2mV, -24mV on GPU, AC CPU power set to 44 Watts on short and long load. NVMe PCI 3x4 SSD, 2 TB Sabrent Rocket (advertised as 3500/3000 MB/s, I measured sequential Write/Read as 1400/1380 MB/s) I have pretty beefy laptop Dell XPS 15, with nVidia 1650 Maybe I am doing something wrong? are there any recommended Memory Cache preferences? Should I use Disk Caching? Should I change the tile size in Cycles? Should I choose Fixed number of CPU cores? Or should I use Eevees? Or Workbench? I wonder what is the Video Sequencer Rendering speed (fps). ![]()
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