I've been running
blue iris the last few years with various hardware (CPU and or NVDEC cards). A high end intel setup works well for most people, but I have about 20 cameras running high resolution that performance was paramount. My last setup was dual xeon E5-2650v2 CPU's running on ESXI 5.5 and windows 10. This barely got the job done, but it did work for my needs. Running H265 was out of the question. I have been testing tons of hardware looking for improvement. Almost every i7 and i9 variant and last years 2990wx threadripper which was a huge disappointment. The 3950x also did not perform as well. You would think an i9-9900k with quick sync would outdo the xeons, but no dice (xeon CPU's don't even have quick sync). Well my xeon system crashed, so I decided to try the new AMD 3970x with ESXI 6.7. I bought a used motherboard on ebay and half the ram slots didn't work so I couldn't run quad channel (go figure). I was already prepared for a performance let down; but I was totally wrong..
The AMD 3970x is AWESOME!! Even being limited to dual channel, this setup smoked my dual xeon server. I want to fully test it when I have another card game at my home (will be awhile thanks to covid). There are probably 8 cameras that will have people moving around which can really tax the CPU. Running at H265, it's more fluid than my dual xeon system at H264! I will probably stick with H264 because it's very CPU taxing and I want to add more cameras. If you have fewer than 10 cameras running less than 15fps and under 4k resolution, you won't need this much CPU. If you are looking for the ultimate Blue Iris hardware that won't drop frames, and run the best quality, then this is it.