motherboard header s

[henry2000227]

Im new to pc building and I found these 3 headers on my hp2af7 motherboard and I dont know what are they. The manual of my motherboard says that there are two USB 2.0 headers, and I cant find any 9-pins headers on the board.
PS. There is a USB 3.0 header and it is plugged in, and the left header in the pic is also plugged in(I pulled it out to take a pic)
Are they the USB 2.0 headers?? But the USB 2.0 headers shouldnt be 9-pin? And why the left one is "one-row" if it is also a usb 2.0 header?
Thanks in advance

 

[Barty1884]

Those 2x5 pin headers leave out the "ground" connection from USB2.0 wiring diagrams.

A 2x5 header is exactly that: 2x USB, so can drive two ports from a header.

The one of the left is a single 5pin, and could only drive a single port.

 

[henry2000227]

The USB3.0 header has already plugged in. Why should the single 5pin usb header also need to be plugged? Isnt it only one usb header need to be plugged?

 

[Barty1884]

Do you have USB2.0 ports on your case, or any device (pump, fan controller etc) that needs a USB2.0 connection?
If you don't, then you don't need to connect anything to a 2.0 header.

 

[henry2000227]

Oh, I think I have sth needs a usb2.0 connection. But what if I buy a new case, and it has only a usb3.0 connectors but no usb2.0 connector. Are the devices using usb2.0 connection still working by connecting to the original usb2.0 ports?

 

[Barty1884]

USB is backwards compatible, you do not need to use 2.0 at all.

But if you have 2.0 ports on your case, you can.

 

[henry2000227]

Thanks for answering so quickly.

 

[racksmith101]

Just a note, most case usb headers are 5x2 with 1 pin missing, your mobo has 6x2 connectors with 2 pins missing so you might have to find some adaptors if you keep that mobo and swap cases.

 

[Barty1884]

Whether it's one pin missing, or two, a standard connector would work...

 

[henry2000227]

The connector which is plugged in the left header is like 5 or 4pinhole leaving the pin on the right not connected, so I think it might be okay using a standard connector and leave out that 2 pins on the right.