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Using the GPU test tool from FurMark i get only 3 FPS.

In normal use I notice it when playing fullscreen videos: When the video pans horizontal i get these stripes across the picture.

My setup is like this:

Mac mini 2011 2.3GHz dual-core Intel Core i5/ 2 GB DDR3 SDRAM (PC3-10600)/500 GB HD/Intel HD 3000/Thunderbolt OS: windows 7 Tv: Panasonic G10 50" plasma Tv and computer are connected with an 2 meter HDMI cable

I've tried to change the HDMI cable - did not change anything.

What can I try?

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Did you install the bootcamp tools following the Windows 7 install? – Mr Rabbit Aug 16 '13 at 20:41
System has been running for 18 moneths without this flickering. Just upgraded to the latest version of bootcamp software you liked to. But the problem persistes :-( – Rasmus Aug 16 '13 at 21:26
Good to hear you've solved it - to represent that on StackExchange, please post your solution as an answer, and accept it by checking the adjacent checkmark! Then the question will be formatted as solved in the question list. – Dan J Oct 10 '13 at 18:36
I've rolled back your edit, please post the answer below instead. – patrix Oct 10 '13 at 20:37
up vote 1 down vote accepted

Finally! - I worked out what the problem was.

I had followed the speedup-tip:

Head to the Control Panel's Performance Information and Tools section, and choose Adjust Visual Effects. Here you'll find a long list of effects, but simply choosing "Adjust for best performance" will turn everything off. You'll feel like you stepped back into a decade ago.

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