Debating whether or not to upgrade my macbook

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i have 2012 macbook pro retina, 8gb, gt650m, 2.3ghz.

thinking upgrading more current model. battery on machine on 1000 cycles , needs replacing, have can describe few white flicks behind screen (which confusing me) , threw graphics error when ran system check recently.

issue repair mac cost me quite bit, quoted £1000 gb replace logic board, screen fix , battery, thinking spending bit more , upgrading not entirely sure model upgrade to. spend lot of time in photoshop , cinema 4d. questions thusly :

1. current 650m vs intel iris pro, kind of improvement see? have read few articles around net , benchmarks not seem overly different. wouldnt mind see improvement. highest priced model nvidia card 1 option pick lot of money me spend right @ moment.

2. yosemite, on mac has pretty messed few things up. doesnt run quick, less said safari better , graphically has caused issues , takes longer boot up. issues there on more modern machines?
 



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