Originally Posted by The F34R Channel
I think that under fast memory I'd say 4000+
hopefully Tom will also try different memory in his reviews.
I would call 4000+MHz Ultra fast, especially given how insane the prices are on those DIMMS.
Here is how I would class DDR4 memory speeds
2400-2800 - Standard (seriously, who needs 2133 given the price of 2400-2666?)
3000-3400 - fast
3600+ - ultra fast