Hardware acceleration is vital! If you're referring to the i7-7700K with 34 cams/1400 MP/s, that's our system. While setting it up I'd tried h.265 to see how it does and didn't even make it to 10 cams before hitting 100% CPU. Currently at 34 cams and will probably end up closer to 40 when we're...
While I'd tried the 21.20.16.4664 driver before, I'd installed it a different way. Following this guide to a "t" worked. Back down to ~50% without having to constantly restart.
Just want to add my recent experience. Over the weekend our 30 camera system went from 65-75% CPU usage to 100% and RAM went from 8GB'ish to over 14GB (16GB installed).
i7-7700K
16GB Ram
Windows 10 Pro
Blue Iris 4.6.5.3
Direct two Disc is on for all cameras
Most of the 30 cameras are Amcrest...