Can i use dual Realtek 8111E PCIe Gigabit Lan?

Depends on what you mean by uploading and downloading.

If you mean all traffic leaving your PC on one interface and all traffic returning on the other, then it's highly unlikely.

If you mean uploading and downloading from the internet, then yes it's possible..... however unless you have a gigabit internet connection you wont benefit from doing this over using a single interface.
 
Traffic leaving a NIC will have a source MAC and IP address for that interface, reply traffic will end up at this source.

So, no.

Also, as above, I highly doubt you have a gigabit or greater WAN connection.
 
Tell us what you WANT to do. Really.

Gigabit lan is 1000mb/s, even if you are on cable at 100mb/s, then you are a factor of 10 out. Even allowing the upload of whatever is still miles away.

(Don't care about terminologies, you lot know what I mean :p)
 
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