Greetings , I currently have 4 x DS-2CD2T85FWD cameras . I'm trying to get them to work with either blue iris or ivms4200 and an i7 computer but its using 100% of my CPU. I believe they are set to max spec and i would like to keep it that way. is that not possible? what is the general rule of thump for this sort of thing. I was thinking of getting an NVR but it can only decode 4 ch at 8mp ( i plan to get 4 more) and the rest at 1080p where i want to have 8 cameras at 8mb. im abit of a newbie at this and require some assistance. can someone please point me in the right direction.