Stuttering with Mpeg4 AVC blu-ray discs

[flood658]

Hi all,

I just bought a Sony BDUX10S BD drive for my pc and have been trying to play a few movies using PowerDVD ultra.

The ones encoded with Mpeg4 AVC (H264?) stutter a lot and cause my CPU usage to jump to 100% - ex. Xmen 3, All spiderman, AVPR

I tried Crash, goodfellas and they all work fine (forgot which codecs they were, but were diff) - about 25-40% CPU usage.

I am able to play ALL my HD-DVDs w/o a problem (VC-1 encoded) (w/o HW acceleration) - PE, 300, Bourne, Batman, Beowulf, American gangster etc.

Any suggestions?

I have HW acceleration ON.

My PC specs:

Pentium D 2.8 GHz
2GB RAM
ATI AIW x1900 256 MB
500 GB SATA HDD
Sony BDUX10S BD drive
Software: PowerDVD 7 and 8 ultra - lag with both so waste of money for upgrade to 8

I thought it was my CPU, but I don't understand how every other hi-def discs play fine except for the MPEG4 AVC encoded BD (HD-DVDs play even w/o HW accel! at 40-50% CPU).

Thanks