Comment by sliken

Didn't find anything clearly stating one way or another, but the CCD is the same between ryzen and epyc, so there's certainly the possibility.

I dug around a bit, and it seems Ryzen doesn't get it. I guess that makes sense, if the IOD on ryzen gets 2 GMI links. On the single CCD parts there's no other CCD to talk to. On the dual CCD parts there's not enough GMI links to have both with GMI-wide.

Maybe this will be different on the pending Zen 5 part (Strix Halo) that will have 256 bits wide (16 x 32 bit) @ 8533 MHz = 266 GB/sec since there will be 2 CCDs and a significant bump to memory bandwidth.