I have a question with regards connecting some fans to an Intel motherboard model S2600CP.

The motherboard documentation is here: https://www.intel.com/content/dam/support/us/en/documents/motherboards/server/sb/g54899001_s2600cp_p4000cp_sg_rev14.pdf 

On page 20-21 there are 4 FAN connectors named X and Y, AF and AG.

The problem is that I have no idea what kind of connectors are these: 6 PINs. I attached a picture too 

I was planning to use these motherboard connectors to replace some old case fans which are using a 4 pin MOLEX connector. 

Edited April 28, 20215 yr by comanbo
update

Page 36 of the same document writes:

4.5 Fan Header Connector Descriptions

 

All system fan headers support pulse width modulated (PWM) fans for cooling the processors in the chassis. PWM fans have an improved RPM range (20% to 100% rated fan speed) when compared to voltage controlled fans. Base and BRP chassis fans are a 4-wire/4-pin style designed to plug into 4-pin or 6-pin SSI Fan headers. When plugged into a 6-pin header, only the first four signals are used (Pwr, Gnd, Tach, PWM).

 

LX chassis fans are a 6-wire/6-pin style designed to plug into 6-pin headers. The extra signals provide for fan redundancy and failure indications (Pwr, Gnd, Tach, PWM, Presence, and Failure). Server Boards installed in this chassis may feature two additional 4-pin CPU fan headers and one additional 4-pin system fan headers. These connections are not required for use with the Intel® Server Chassis SC5600. To assist with fan connections in the system, the system fans are numbered one through five and color-coded. These correspond to fan header numbers on the server board. Fan 1 and fan 2 connectors are white in color and the fan 3, fan 4, and fan 5 connectors are blue in color. These colors should also match between server board and fans.