DS-7604NI-E1/4P v DS-7104N-SN/P

7604 has much better hardware than 7104 and can handle up to 6MP cameras.
I bought mine from Hi Secu (http://s.click.aliexpress.com/e/A4ftuTA) shipped from USA, seems there is no stock available to send from USA right now but anyways has better price than the seller you've posted.
http://s.click.aliexpress.com/e/bk2DmarI

Xinray is also a great seller. I bought many cameras from him.
http://s.click.aliexpress.com/e/bRcRWJDW

If you have 4 cameras go for 7608, it will have better performance and you will not have to change it if you need to add another camera.
 
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7604 has much better hardware than 7104 and can handle up to 6MP cameras.
I bought mine from Hi Secu (http://s.click.aliexpress.com/e/bAw06YIk) shipped from USA, seems there is no stock available to send from USA right now but anyways has better price than the seller you've posted.
http://s.click.aliexpress.com/e/bDdv2wVi

Xinray is also a great seller. I bought many cameras from him.
http://s.click.aliexpress.com/e/c4DWmGa4

If you have 4 cameras go for 7608, it will have better performance and you will not have to change it if you need to add another camera.

ok thank you. What do you mean by "better hardware"?
 
Overall. 7604 supports up to 6MP cameras, 7104 supports up to 2MP cameras.

well i have a 7604 with a 3Mp + a 4Mp camera. How does that work then? Both cameras are recording at their maximum resolution.

What happens if i connect four 4Mp cameras to a 7104? It record each camera at 6Mp/4 = 1.5Mp?
 
well i have a 7604 with a 3Mp + a 4Mp camera. How does that work then? Both cameras are recording at their maximum resolution.

What happens if i connect four 4Mp cameras to a 7104? It record each camera at 6Mp/4 = 1.5Mp?

7104 is limited to TWO megapixel resolution.
So if you connect 3MP and 4MP cameras to a 7104 NVR, you will only record them at 2MP.
 
7104 is limited to TWO megapixel resolution.
So if you connect 3MP and 4MP cameras to a 7104 NVR, you will only record them at 2MP.

Ok i think i get this(stay with me pls).

So the 7604 can record four cameras @ 6Mp?
 
Sister has 7104 and it's great but only 2MP. No fan, easy to use and cheap. Perfect for her house. If you're on a budget than 7104 is miles better than Analog TVL crap.

I have 76xx but I'm probably not your average consumer but for a home I find 2MP low-light fine.