Comment by bob1029
2 days ago
At a minimum, we should be able to get everything to DRAM speeds. Beyond that you start to run into certain limitations. Achieving L1 latency is physically impossible if the storage element is more than a few inches away from the CPU.
Most new motherboards do already have the highest throughput M.2 connector very near the CPU.
The most recent desktop I built has it situated directly below the standard formfactor x16 PCI slot.
I think part of the reason why it's so close is also for signal integrity reasons.
Far more so than latency.
Also: routing PCIe lanes is a pain. Being able to take 4 pairs and terminate them makes routing everything else simple