Audio chipsets from Realtek are used in motherboards from many different manufacturers. If you have such a motherboard, you can use the drivers provided by Realtek.
Motherboard or PC manufacturers may be slow to catch up on the latest drivers from chipset manufacturers. Therefore the audio driver version you can download at your PC manufacturer's site is not the latest one. The Realtek HD Audio Driver you can download here supports all Realtek High Definition Audio chipsets.