gonzorob

If you have 2x 16Gbps TB2 channels, then you'd use two enclosures to do it as has already been demonstrated. However, it's likely that your two ports are just one 16Gbps link in which case using a bridged TB enclosure gets the same bandwidth:

Using single-slot unbridged TB enclosures

http://forum.techinferno.com/implementation-guides/8579-2013-13-macbook-pro-2-x-titan_z%4016gbps-tb2-akitio-thunder2-osx10-10-%5Bnesone%5D.html#post116923

http://forum.techinferno.com/implementation-guides/7326-2013-13-macbook-pro-gtx780ti-sli%4016gbps-tb2-sonnet-ee-sel-win8-1-%5Bsquinks%5D.html#post100318

Using multi-slot, bridged TB enclosures

http://forum.techinferno.com/implementation-guides/8585-2014-15-macbook-pro-2x-r9_280x%4016gbps-tb2-netstor-na211tb-win8-1-osx-%5Bgoalque%5D.html#post117016

The system claims each port is 20 Gbps

"Port: Status: No device connected

Link Status: 0x101

Speed: Up to 20 Gb/s x1

Current Link Width: 0x1

Receptacle: 1

Link Controller Firmware Version: 0.14.0

Port:

Status: No device connected

Link Status: 0x101

Speed: Up to 20 Gb/s x1

Current Link Width: 0x1

Receptacle: 2

Link Controller Firmware Version: 0.14.0"

Is there a terminal command to check if these share the same Thunderbolt chip?

Can't say for sure about a iMac, but for a Macbook Pro it's not possible to get 32Gbps bandwidth across two 16Gbps-TB2 ports due to their bus layout as explained. It's more than likely that a iMac uses the same bus layout.

Thanks for the quick reply! How would I check?

Even if you could get 32Gbps over two ports would it be very tricky to implement?

Hello,

Would it be possible to use two Thunderbolt2 ports to increase the bandwidth of a eGPU? I'm using a 5k iMac and would love a bit of extra performance in Bootcamp for gaming.

Cheers

R