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Above TDP are for standard cards. iMacs have the mobility version.
Radeon 5750m emits 25W, 6970m emits 75W.
Still three times as much.
Better placement: between original HDD and optical drive, below GPU heat pipes. this will leave the air flow from the ODD fan to the GPU heat sink intact. WIll only work with 1.8" SSD's.
30cm SATA cable will do.
the increase in heat emission is 85W -> 250W! use Macs Fan Control to speed up your fans and while you're at it, replace thermal compound on the card.
Had to do this on a 2010 i5, not enough room otherwise!
- removed 2x3mm piece on the left corner of the gap
- made the gap 4-5mm deeper
Done on a 2010 i5 2.8. I also did the following improvements while in there:
- i5 2.8 -> i7 2.93
- installed extra SSD
- RAM 4Gb -> 16Gb
What i found:
The 6970 2Gb emits 250W of heat compared to 85W of the original 5750 (in my machine).
Since the ODD fan cooles the GPU heat sink but the sensor used to control the fan is the ODD temp sensor, the card will get REALLY HOT (97.5°C tops) and fall back into power safe mode to conserve energy and cool down.
What i did:
I put the SSD in between the original HDD and the Optical Drive so it doesnt block air flow from the ODD fan to the GPU heat sink.
I applied new thermal compound to the card. Old one was really thick and not well spread.
I installed, and HIGHLY RECOMMEND this programm (both in windows 7 and OS X): Macs Fan Control
It lets you set the sensor, the base temp and the top temp for all three fans individually. Set the ODD fan to use the GPU heat sink as temp source and set temps to min:35 max:70. I'm getting a max of 78° which is fine for the card.
Bam, problem solved.