Very good to know. I feel good about going with the pentium (G4620). Incidentally the performance difference between the kaby lake pentium and the kaby lake i3 is negligable. Both are dual core with 4 threads. The main difference seems to be the i3 has the avx extensions, which won't make the slightest bit of difference if I'm not cpu mining.
The only difference points would be a hugely mis-built system. The data does have to travel through the CPU RAM and could bottleneck some if the numbers would ridiculous. A mid-range 32 GB GPU card, flowing into a PC with 1 GB of RAM might see the data slow some upon entering the FSB.
User built systems might get this jacked up, but the big culprit are the PC companies flooding places like Wal-mart with PC's that are widely different and built off a small base of motherboards.
This might put a system on the sales floor with lower PC specs, but nothing stopping a user from dropping two video cards in the box. Too many generic stock boards used to built a wide set of spec'd PC's.