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iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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New Graphic Card Causes Screen To Flicker

I've just had the old 4850 Graphic card replaced with a Radeon HD 5670, 512MB VRAM and increased the Ram to 12GB I notice sometimes the screen flickers? Should I be concerned or is there a fix?

Any help much appreciated!

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The 4850 card was dead. It was repaired by someone who specialises in iMacs

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I would be very concerned. What was the part source? What was the repair source?

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