1. Very few businesses are in the position to replace perfectly running, functional hardware just to save $.10 (10 cents) or less per day on electricity costs, per system.
2. The cheapest i5-6500 system on Ebay is $100 more than the i7-3770 system I linked. It's pre-owned, also.
3. Regarding H.264 vs H.265 - in my setup, replacing 24 cameras and upgrading to a 6th or 7th generation Intel processor to get H.265 support would be about $3000, and the only benefit would be higher quality at lower bitrate. If I were to spend just $500 on extra hard drives, I could up the bitrate on my cameras to the max and get equally good quality and probably higher recording capacity than a person using H.265 on a single large drive.
4. Because I'm curious, I opened the interface. UI2 now reports 58% average CPU use, instead of 50% with the interface closed. Still barely breaking a sweat.
I think this is an important discussion because it's a common belief on this board that only new hardware will suffice for large IP cam systems. Well, I'm here with one of the largest systems on this board I'm aware of, and I'm telling you and everyone else that 5 year old hardware will run
Blue Iris just fine, and way cheaper than newer hardware will.