I just spent way too much time looking for information for an ASUS P4S8L mainboard built into a Pundit PC. The mainboard is not listed in the proper section on asus.com. I finally figured that in the ‘Product’ category one must not choose ‘Mainboard’ (which would be obvious, right) but ‘Barebone’ instead. Then you need to pick ‘Pundit’ -> ‘Pundit-S’.
To easen this for you I attached the mainboard manual to this post.