CR4 may refer to:

Science and technology

* Complement receptor 4, a complement receptor in the immune system * CR4, a control register in the x86 CPU architecture * 100GBASE-CR4 and 40GBASE-CR4, in

100 Gigabit Ethernet 40 Gigabit Ethernet (40GbE) and 100 Gigabit Ethernet (100GbE) are groups of computer networking technologies for transmitting Ethernet frames at rates of 40 and 100 gigabits per second (Gbit/s), respectively. These technologies offer significantly ...

and 40 Gigabit Ethernet

Other uses

* CR4, four-firm concentration ratio, a measure of market concentration in economics * CR4, a postcode district in the CR postcode area in England *

Pasir Ris East MRT station Pasir Ris East MRT station is a future underground Mass Rapid Transit station on the Cross Island MRT line located in Pasir Ris Pasir Ris is a planning area and residential town located in the East Region of Singapore. It is bordered b ...

(CR4), an upcoming MRT station on the Cross Island Line in Singapore {{Letter-NumberCombDisambig