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Hi, I want to upgrade the RAM. Can I put a 8 GB RAM Chip or do I have to put 2 units of 4 GB each? Thanks.

Yes, you can use 8GB memory modules in your system. In fact with the latest firmware on your system you can populate your system to a max of 32GB of RAM using four 8 GB modules. I do recommend using matched pairs when ever possible. In this case two 8 GB modules would be better than buying just one as later on you would need to replace it with a newer unit to match the second for the bank. You could have different pairs each a matched pair across the different banks.

Yes you can I would recommend crucial.