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weird hardware problem? help plz

Forum Graphic & Displays : Graphics Cards - weird hardware problem? help plz

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hi

i have a weird problem with my nvidia GF 7900GTX.
has anyone seen such "effects" before?

screen1

screen2

this effect appears and disappears sporadically only in 3D applications. sometimes it goes away after many hours and sometimes after some seconds.
there was no problem for 6 months, but now..

all temps seems to be ok.
monitor is ok.
memtest is ok.

my pc
------------------
vista ultimate x64
intel D975XBX
core2duo 6400
7900GTX 512MB
2x 1GB RAM
530W case

thanks
kromit

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