The default sound drivers (the generic ones) that come with a freshly installed windows 8 are probably the best. The truth is that audio drivers haven't changed much in the last 20 years. Underneath it is all the same software, it's just repackaged with new layers to interact with kernel timers.
By the way, accelerated audio is a joke. It never existed. I call it phantom technology. All they did was put the audio service as the highest priority right behind video, so it was a way to deliberately hobble audio so they could sell you a card that had a 1 instead of a 0 in its settings so it could bus-master, or come close to real time priority by turning on certain timing channel features which were already present from day one to begin with on every audio card.
If anyone can give me a detailed whitepaper explaining exactly what audio accelearation is and how it worked with the hardware I will admit I am wrong, but I don't think I am from my research.
