Sorry, is not a overclock issue. Unfortunately  the issue occurs randomly when 
in xorg.conf I have:
Section "Device"
        Identifier      "Intel Corporation 965 G1 Integrated Graphics 
Controller"
        Driver          "intel"
        BusID           "PCI:0:2:0"
        VideoRam     393216
        Option          "AccelMethod" "EXA"
        Option          "MigraionHeuristic" "greedy"
        Option          "ExaNoComposite" "false"
EndSection

and also:

Section "Device"
        Identifier      "Intel Corporation 965 G1 Integrated Graphics 
Controller"
        Driver          "intel"
        BusID           "PCI:0:2:0"
        VideoRam     393216
        Option          "AccelMethod" "XAA"
EndSection

Bios setting for Integrated video card:
DVMT Mode Select -> DVMT Mode
DVMT/Fixed Memory -> Maxim DVMT (384 Mb)

How to for debug? 
Thanks

-- 
[Hardy] system freezes after start with Intel driver (Intel G35)
https://bugs.launchpad.net/bugs/196220
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