Dual 24" cinema displays - performance difference between 6490M and 6750M?

Hi,
I am running 2 x 24" Apple Cinema displays and need to choose between the 2.2ghz i7-2635QM and 2.0ghz i7-2720QM MacBook Pro 15" offerings. They come with the 256mg HD 6490M graphics and the 1gb 6750M graphics.
I do a bit of Photoshop CS3 (once a month), rarely any video rendering.
But as I run dual monitors (via a Matrox DualHead2Go DP edition) I am keen to find out if the extra £300 for the higher spec will actually assist my usage.
Its currently running on a MacBook Pro 6,2 2.4ghz early 2010 model. It runs fine on this.
Thanks
Eric

Can't help with your question, but wondering what video adapter you are using to connect 2x Cine Display to your MacBook Pro as I'd like to do the same.
KD

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Dual 24" cinema displays - performance difference between 6490M and 6750M?

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