NVR hardware specs for a channel/resolution/fps relation

Hello,

I'm trying to build a NVR (network video recorder) on an ARM based embedded linux board.

I have seen NVR manufacturers mentioning specs in the form of a relation like:

<no. of channels> * <resolution> @ <fps>

I understand that this relation is quite straightforward in terms of network bandwidth.

However, I need to know how one can determine the hardware specifications (CPU, RAM, etc.) for a given relation.

For example, say I need to support 8 channels * 1080p @ 30fps, how can I determine the required hardware specifications for my board?

And similarly, for the same hardware, I would like to know what max. fps can be supported for 8 * 2K cameras.

Thanks in advance.

any newish pc should be able to handle IP cameras with no problem. The only thing I can think of that demands the latest CPUs is if your cameras are going to utilize H.265 codecs. I have 32 cameras on a 2012 i7 built PC and its no issue.