The ratios are mostly correct, but the absolute numbers are wrong these days. For example, memory read latency can be 45ns (not 100) with a decent DDR4 kit and

The ratios are mostly correct, but the absolute numbers are wrong these days. For example, memory read latency can be 45ns (not 100) with a decent DDR4 kit and data center latency can be 10us (not 500us) with infiniband.