Some HD games aren't working

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http://androidforums.com – Hi! I'm using HTC Desire Z (overclocked to 1Ghz) with CoreDroid ROM (for a long time), and I have tried to install few HD games, but they didn't worked. :( First of all, Fast Five: when game is launched, it freezes whole phone on loading screen and I must pull out battery. Real Racing 2: when game is launched, it's pretty lagging, and when I start race it closes game on loading screen. Asphalt 6/7 and Modern Combat 3 won't even show loading screen on start - game is immediately closed. Reason why I'm asking for help is because I have installed Asphalt 5, NFS Shift and Hot Pursuit, and the (General)