Are these devices compatible?

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highest possible is mostly a waste of diskspace.. the quality difference between lets say, 8Mbps and 15FPS and 10Mbps and 30FPS is minimal.. but the storage differences are considerable.
 
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As peoples here always says one who needs a four channel NVR/DVR. He always needs to buy an eight channel. In future you can upgrade your system without investing so much on it.

Me also suggest the same, go for a 8 Channel NVR