If you already have a win7/10 product key, you can build your own for less than $400. You can also get win10 for free if you have an edu email account.
System Builder - Core i5-8400 2.8GHz 6-Core, SRM-01 MicroATX Mini Tower - PCPartPicker
8400 is equal to or slightly better than 6700 in most...
Can i install this on my soffit?
Edit: i want to use my old pc/nas to store the streams 24/7. I see that this cam encodes h265, so I guess my pc wouldn't have to do anymore encoding, how much power do I need to record and live view 5 cams? Is a athlon x4 620 enough?