Its not even that good with the G75. They soldered the chip into the mainboard itself so you're SOL
No they didn't.
The problem is that the 680m and 7970m will probably be too tall and of course the heatsink will have to be rebuilt. But the 7970m at least will probably work electrically, and you can always shave off a bunch of plastic in the chassis to get it to lay flat.
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