Hello all
i wanted to give you my feedback about upgrading HD4850M to the HD6970M 2GB, that i've just do !!
As as have readed before in this thread, some people hesitate to upgrading like this, and here my experience :
My imac is : 27" i7 (860) late 2009 model version 11,1
the card i bought : http://applecomponents.com/items/661-5969_card-video-amd-radeon-hd-6970m-2gb/000 0005113?pn=1&s=661-5969&per_page=30
How to :
1) open the imac, remove the panel take care cables .... as usual
2) unscrew the end of the frame heatskin of graphic card (HD4850m)
3) unscrew the 3 screws on thegraphic card support to motherboard4) removing the probe T°C connector
5) unplug short small movement the graphic card on its slot
6) cut about 2 cm ² plastic where the larges cables are for the new heatskin of graphic card, HD6970mis a little morecumbersome (it's easy to compare both cards)
7) replace the larges cables correctly
8) positioning the graphic card and plug as the same as original step 3) and 2)
9) don't forget to re-connect the probe T°C connector
10) close the imac and go !
Strated in Osx 10.6.8 (with lastet drivers for HD6970m) and it immediatly reconized on my desktop !
Performances are about 2x than the HD 4850m under Bootcamp (windows 7 64bit, Catalyst 12.8 needed)
The best of all is, the T°C is lower than the the old one and nice to be ovecloked via ATI overdrive utility
Let you to try this, you will not be disappointed !!
For french people (what i'm) you can order to applecomponents.com very easy shipping to french without any Taxe ... just specify "Gift" .
That all, thanks to have read me with my very poor english 🙂