Please note - this question is about latency of the card itself. Not latency of internet or anything else. Thank you for your attention on this matter.

It is often said that good server NIC does make difference compared to low grade cards and on-board Ethernet chips.

I understand that on-board chip will likely consume CPU time and stand-alone card would use its own chip.

Also server card would be faster than low-grade card.

Are these 2 facts explaining most of the server cards advantages over on-board and low-grade cards ethernet?

How would you measure latency on the card itself? I saw some reports stating some microseconds figures of NIC latency but I dont see how to measure that... Any advise will be appreciated.