Is the difference in processor speeds worth it?

Is there a noticeable difference in speed between a 2.2GHz quad-core processor i7 and 2.8 GHz quad-core processor i7?
I'm also trying to decide between the Intel Iris Pro 5200 graphics and NVIDIA GeForce GT 750M. I saw somewhere online a conversation that said the Iris Pro was actually better for Photoshop while the NVIDIA was more for gaming.
I'll be using the computer for mostly for photoshop CS5 and large high res files 100MB up to 1GB in size. I might use Blender 3d on it from time to time too.
Any thoughts on either decision would be appreciated.

That's interesting, I haven't seen any tests showing up to a 30% difference in speed... Would that be overall performance, or something more mundane like copying a large file? Things like that I can deal with if copying say 30 gigs to an external. No big deal, just watch TV a little longer. But if that translates into common tasts, like a 20% speed increase in Photo Mechanic, or opening/converting 12 mb RAW files in PS or C1, that would make a difference to me.
At the Indianapolis Apple store the 7200 comes stock with the 2.16. However, they said that is not exchangable with the 2.16 7200 you might order from the online store, even if the specs are exactly the same, because the model number will be different or something like that. So... I'm in the US for about 16 days, and don't have time to adequately test two models if I have to send one back for exchange by courier if it was bought online. I have to choose between the 2.0 and 5400 or the 2.16 and the 7200. Luckily the lady at Crucial said the RAM chip is the same for both models so I've already ordered another 1 gig chip to drop in.

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    Solved!
    Go to Solution.

    dawitbogale wrote:
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