'''Because of EFI (driver) problems you can not just stick any old Intel CPU in an Apple box. '''So if you have the lesser CPU of your model run you could conceivably upgrade to the fastest OEM version by either replacing the CPU from a damaged (if your model has a removable CPU - not all do) unit or replacing the entire logic board.
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'''Because of EFI (driver) problems you can not just stick any old Intel CPU in an Apple box. '''So if you have the lesser CPU of your model run you could conceivably upgrade to the fastest OEM version by either replacing the CPU from a damaged unit (if your model has a removable CPU - not all do) or replacing the entire logic board.
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'''Either is a very advanced DIY project ''' (not a place to beging DIY computer upgrading) requiring you to completely disassemble then reassmble the entire machine.
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'''Either is a very advanced DIY project ''' (not a place to begin DIY computer upgrading) requiring you to completely disassemble then reassemble the entire machine.
''If this answer is acceptable '''please remember to return and mark it'''.''
See [https://www.ifixit.com/Answers/View/140873/Replace+video+card+in+iMac|this] and [https://www.ifixit.com/Answers/View/129166/Change+iMac+27%22+mid+2010+Graphics+Card|this] answer.
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'''Because of EFI (driver) problems you can not just stick any old Intel CPU in an Apple box. '''So if you have the lesser CPU of your model run you could conceivably upgrade to the fastest OEM version by either replacing the CPU from a damaged (if your model has a removable CPU - not all do) unit or replacing the entire logic board.
+
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'''Either is a very advanced DIY project ''' (not a place to beging DIY computer upgrading) requiring you to completely disassemble then reassmble the entire machine.
''If this answer is acceptable '''please remember to return and mark it'''.''
See [https://www.ifixit.com/Answers/View/140873/Replace+video+card+in+iMac|this] and [https://www.ifixit.com/Answers/View/129166/Change+iMac+27%22+mid+2010+Graphics+Card|this] answer.
''If this answer is acceptable '''please remember to return and mark it'''.''