I have 9 amcrest cameras (7 dome POE and 2 wifi). Dedicated server with i5 and 8gb ram win 10. Ssd for main and wd purple for recording. I have direct to disk, blue iris encoding, intel hardware quicksync accel and everything else rec. I've stepped down fps to 10 for all cameras. I even brought resolution down a notch as they are 3mp cameras. Cant seem to find culprit. I purchased i7 and waiting on ssd so see if that helps but cpu is only at 60-70% and 2.4 Ram. I am using continuous recording and turned off pre trigger buffer and that helped cpu usage.
On another note when I initially make changes I get cpu drop down into 20-30’s but then it always comes back up to 70’s.