Question 1

this card will replace my sata 2 drives or will add two sata 3 drives ?

Accepted Answer

I think you meant to ask whether ti will replace your SATA2 PORTS, not drives.  No, you will still have the functionality of those ports but these SATA3 in addition to those.  You could choose to replace where a drive is connected, to plug it into this card instead of your motherboard SATA, but you don't have to.

Question 2

Can you use all ports at the same time? I have similar card that only lets you use one or the other. Want to use both my SATA drives and anything else simultaneously

Accepted Answer

You are confused.  Your similar card has both internal SATA and external eSATA, so it's not all that similar because this does not have eSATA, instead USB3 on the slot bracket.  Yes you can use both of the SATA and both of the USB3, all four ports concurrently.

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