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Hello,
Here is some very useful info on our NVR-SB64...
For starters I'm sure you have realized that this NVR supports two HDMI outputs. It is very important you know HDMI #1 is NOT the main display, HDMI #2 is in fact the main display, while HDMI #1 is the secondary display (Video Matrix). That being said, only the main display (HDMI #2) can support a 4k output, the secondary display (HDMI #1) only supports up to 1080p output. Please see the images below.
![Image Enlarger](https://www.securitycameraking.com/securityinfo/wp-content/sp-resources/forum-themes/reboot/images/sp_Mouse.png)
In Addition, you should also know that you can only watch up to 32 cameras at a time on both main and secondary displays. However, on the secondary display you can enable a tour to change between two sets of 32 cameras (1-32 & 33-64) if necessary. You can also do cameras 1-32 on the Main display (HDMI #2) and cameras 33-64 on the secondary display (HDMI #1) if that suits your needs better. There are also many many different sets of tours you can enable under the secondary display. Please see images attached.
![Image Enlarger](https://www.securitycameraking.com/securityinfo/wp-content/sp-resources/forum-themes/reboot/images/sp_Mouse.png)
Hope this is helpful for you. If you have any questions/comments we would be happy to help. Thank You!
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