With HW acceleration turned off there is no tearing playing the same scene sequence. CPU utilization goes from about 15-20% with HW acceleration off to <3% utilization with HW acceleration turned on.
Playing .m2ts HD video.
My equipment is Geforce 9400gt in an Intel Q6600 quad core, 4 GB of memory, running Win7 32 bit.
Running latest version of PowerDVD 10 Ultra but issue exist on all previous versions.