I have HP DC 7800 Small Form Factor (SFF) Built-in Speaker on Motherboard of Sound Max.

1. Free Sound Driver Download Realtek
2. Hp Compaq Dc7800 Sound Drivers
3. Sound Driver Download Windows 10

Download the latest driver, firmware, and software for your HP Compaq dc7900 Small Form Factor PC.This is HP's official website to download drivers free of cost for your HP Computing and Printing products for Windows and Mac operating system.

I installed Windows 7, 8, 8.1.

but

There is no drivers of this device, i need to download drivers from HP Site and Install it in my system.

I wish , Microsoft should install these drivers in future updates and also in .iso of Windows 9 in future.

Drivers Hardware ids of this device:

Free Sound Driver Download Realtek

Hp Compaq Dc7800 Sound Drivers

HDAUDIOFUNC_01&VEN_11D4&DEV_1884&SUBSYS_103C2818&REV_1001
HDAUDIOFUNC_01&VEN_11D4&DEV_1884&SUBSYS_103C2818

HP Drivers link for HP DC7800 CPU:

http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/psi/swdHome/?javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken&javax.portlet.prp_bd9b6997fbc7fc515f4cf4626f5c8d01=wsrp-navigationalState%3DswEnvOID%253D4053%257CswLang%253D%257Caction%253DlistDriver&javax.portlet.tpst=bd9b6997fbc7fc515f4cf4626f5c8d01&sp4ts.oid=3459245&ac.admitted=1408972897921.876444892.199480143

http://ftp.hp.com/pub/softpaq/sp45501-46000/sp45615.exe

Sound Driver Download Windows 10

See this Screenshot, (after installing HP Drivers)