[SOLVED] Which motherboards use 8-pin power connectors ?

[Jacob 51]

My PSU has two connectors for CPU, two 4-pin connectors.
When is the second one used? My motherboard uses only one port (Zebronics H61).

 

[kerberos_20]

pretty much any modern mainboards are using it
its used whe your mainboard needs more power for CPU.
LNA overclicking mainboards or dual CPU boards have even more 4pin EPS connectors
8pin provides ~300watts for CPU