I think OSX can combine both Ethernet port together as a single connection (like the idea of software RAID 0). Which may able to provide up to ~200MB/s transfer rate.
I only have one Mac, so can't test it myself. Anyone have experience on this?
IF you're willing to update the firmware and turn it into a 5,1 so you can run Sierra (very easy to do, once you've read the directions a couple of times)...you could drop a USB 3.1 Gen2 PCIe card in there, and get 750MBps, real world.
Which card is that? There are other threads with people having difficulty going past 5Gb/s (~600MB/s).
I think the fastest, though quite expensive, way would be to get a 10GbE PCIe card in the Mac Pro and a Thunderbolt to 10GbE converter for the MacBook Pro. This should allow transfer speeds of ~1MB/s.
https://www.akitio.com/adapters/thunder2-10g-network-adapter
If you set the MBP to be the target, yes.Could you target disk mode and connect to USB 3 card?