Yup, per Parapunter.
My ASUS P5N32-SLI motherboard came with SoundMax on board and I too had to reinstall the drivers after a rebuild, but in my case it was very easy to do so as I had been supplied with a CD that contained the drivers.
I will say though that for the small cost involved (I paid about £15 from memory via a web store) installing a Soundblaster Audigy SE sound card was a smart move. Much better, I can now "record what I hear" (which my version of SoundMax didn't support but I wanted so that I can record internet radio shows for playback on my long haul flights) and the dolby surround is actually stable and well defined now which it never was with SoundMax. Although the PC's CPU isn't short of horsepower I won't complain that it's now got one job less to do, either.
For the record I have left SoundMax physically installed (in my case at least it came as a small circuit board mounted on the motherboard) but have disabled it in the Hardware options as well as in the BIOS.