The motherboard (IBM FRU 13R8926) has on-board ADI SoundMax audio. It's used in a variety of IBM/Lenovo desktop computers- including ThinkCentre A50p and M50. This should be the download page for the A50p and M50 models:
http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-50534
You should be able to use the ADI driver-only download on newer (x86) versions of Windows; although it indicates 98SE/2000/XP, version 5.12.01.5410 worked fine on my Windows 7 Professional install.
IBM/Lenovo lists drivers under the system model number, rather than by component, but you can search the IBM and/or Lenovo site for the FRU number (13R8926, in this case) to find the systems that it goes with, and then pick one of those systems to find the relevant downloads.
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