Supported Dell devices that use Realtek High Definition Audio codec can be expanded below, to install simply download the .exe file and save to a location on the machine you are going to install the driver on. Run the exe file as an administrator and follow the prompts.
Realtek High Definition Audio Driver
File: Realtek-High-Definition-Audio-Driver_822R6_WIN_6.0.1.6086_A01_01.EXE
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All Model numbers for this device
Latitude 3150
Latitude 3160
Latitude 3340
Latitude 3450
Latitude 3550
Latitude E5250/5250
Latitude E5450/5450
Latitude E5550/5550
Latitude E7250/7250
Latitude E7450
OptiPlex 3020
OptiPlex 3020M
OptiPlex 3030 All-In-One
OptiPlex 7020 Small Form Factor
OptiPlex 7020 Tower
Optiplex 9020
OptiPlex 9020M
OptiPlex 9030 All-In-One
Precision M4800
Precision M6800