GPU replacement & logic board upgrade

Hi,

My iMac's graphic card failed and the local shop I sent my computer advised me to replace the logic board. There are a few things I would like to ask :

1. Is it possible to replace only the GPU?

2. If the logic board must be replaced, I am thinking of upgrading. I have read somewhere that Mid 2010 and Mid 2011 (EMC 2428, iMac 12,1) are similar inside. Is it possible to replace EMC 2389 logic board with EMC 2428? If not, what is the fastest processor I can upgrade to?

Many thanks in advance.

Kerrel

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