PC case audio sockets can produce HD Audio or only AC-97?

[vwgolfman]

Hi,
My PC case has an audio socket and a microphone socket on the side panel.
I wish to determine whether these sockets are capable of reproducing HD Audio or whether I am limited to AC-97.

There are two separate cables from these sockets having the following identities:

Cable 1....
MIC_PWR
MIC_IN
GND

Cable 2....
R_OUT
R_RETURN (joined to R_OUT)
L_OUT
L_RETURN (joined to L_OUT)
GND

Please can I ask those of you in the know which format these sockets are and can you please direct me to a diagram of the necessary connections?

Many thanks for your time.

 

[Marsman]

AC97 by the look of it. HD has pins named Port 1L and 1R, Port 2R and 2L, Presence, amongst others.