I'm running SONAR X2 x64 on an HP laptop and when just editing or checking out things I often use the onboard Realtec driver without any issues. I also use ASIO4ALL if an ASIO driver is required (other DAWS and some standalone synths etc) and it too works fine. Of course I'm not doing live monitoring but for a sketchpad, playback and editing this works perfectly well.
It can take a bit to setup but some advice: Disable Windows sounds and this will stop Windows from grabbing hold of the onboard sound and creating all sorts of conflicts wioth SONAR which is the root of most problems. YVMV