Hi, My system configuration is as follows: Pentium 4 3.0 ghz ht, 2gb ddr2 667 RAM, Intel 946gzis motherboard, ATI Radeon 4650 pcie Graphics card. The OS is Windows XP SP3. I use media player classic home cinema in K-lite codecs pack to play bluray movies. When I play 1080p mkv files the video stutters and does not play smoothly but 720p bluray files play smoothly. There is no option for dvxa in mpc. Should I upgrade my processor to Core 2 duo. I think Ati Radeon 4650 is enough to play 1080p bluray without upgrading my processor. Please help.