It's the unfortunate downside to these. Two of the dies don't have direct access to memory, but it seems like AMD didn't want to do a refresh of the pinouts and

It's the unfortunate downside to these. Two of the dies don't have direct access to memory, but it seems like AMD didn't want to do a refresh of the pinouts and force socket updates. I suspect this will be left for the Zen 2 version of Threadripper. That being said, I imagine in most circumstances the performance should still be pretty good.