Public bug reported:

Ubuntu Hardy Heron 8.04
Nvidia 6600GT
Athlon Thunderbird 1.3GHz (no SSE)

On my system jockey recommends installing nvidia-glx-new (169.12).
Convenient but GLX doesn't work.  glxinfo reports "Illegal Instruction"
and any OpenGL app fails with similar errors.  The reason is that
starting with the 169 series of drivers, CPUs must support SSE and older
Athlons don't.  More info here:
http://www.nvnews.net/vbulletin/showthread.php?t=104914

Bug #214379 also reports this issue against Compiz.

This situation should be checked for by jockey and nvidia-glx-new should
not be installed when /proc/cpuinfo doesn't show SSE support.

** Affects: jockey (Ubuntu)
     Importance: Undecided
         Status: New

-- 
nvidia-glx-new 169.12 fails with CPUs without SSE
https://bugs.launchpad.net/bugs/239652
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