I ordered a sound card instead. Hope that helps a little. Though last night the visuals were the smoothest in a long time.
Just be sure to remove the drivers for the onboard sound device and disable it in the Windows device manager.
I doubt you will see any difference though, in a general sense. It is about increasing the efficiency of the hardware. In just provides more useable bandwidth for the rest of the computer system.
Things like the CPU no longer needing to invalidate its cache (all cores) when the onboard chip accesses memory, or when the video card needed just a fraction more time to load that texture and so on. Those gains are very real, but not something you may be able to tell without being able to switch between the two sound devices, at that very moment.
It is the difference between putting segments of a graph end-to-end versus overlapping them. When you overlap them, the gross length of the graph gets shorter. In other words, more will get done, in a shorter period of time.
