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the 27" versions of the new iMac come with either the AMD HD 6770M or HD 6970M GPU. How do they compare performancewise? Is it worth its money?

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What do you want to do with it? Are you a hard core gamer or a die hard iOS developer? Those are totally different things. :) – rightfold May 4 '11 at 15:59
If you're going to do 3D stuff (Gaming, CAD, etc.) you want the fastest available card, especially on a system that won't allow you to upgrade it. That machine is going to be with you for the next 2++ years (my Mac Pro is from 2008 but I have upgraded the video card, an iMac owner can't). So unless you plan on upgrading the whole machine in a couple of years or you don't care about graphics, I suggest you go for the high end, if you can afford it. – Martín Marconcini May 4 '11 at 19:14
I am a multimedia guy (final cut pro, illustrator, aperture, lightroom, photoshop, Garage band, reason), software developer (visual studio, xcode) and die hard HD movie freak. – bitbonk May 4 '11 at 19:15
up vote 0 down vote accepted

It seems the answer is 'not huge, but noticeable', maybe 15-20%. I'm not sure what the price tag difference is off hand, but if you're working on graphics apps, games, video - get what you can afford, with the iMac's not being upgradeable in that sense, what can it hurt to do so? With an all in one I'm a big believe in buying what you can afford to get.

That said - if you're going to replace the machine next year? Don't worry so much.

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You can compare these graphic cards at Tom's Hardware

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That are not the mobile version – bitbonk May 4 '11 at 20:52
I found at Tom's Hadrware again that 6970m is little less powerful than a 6850. I also found on different board that 6770m is little less powerful than a 6670. So can make your own compare from Tom's Hardware Radeon 2011 page – Bil May 4 '11 at 23:00

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