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http://www.notebookcheck.net/Review-Schenker-S413-Clevo-W740SU-Notebook.98313.0.html

They did some great head to head comparisons between the Iris Pro and 640/740 as well as 650/750. Which is interesting for two reasons. They confirm that the 6 to 7 leap isn't huge. Also that iris pro is a bit faster than the 40 series and lags the 50 series by about 20-30% in real world gaming.

Already in several threads, and again, the 750M or 650M on the MBP may not be the same as tested. Why? Because Apple overclocked the original 650M, we need to wait for specific Haswell rMBP benchmarks, or perform them, and see what this 750M is up to. Just wait for Anand's review.

Aso of note, you do not know if those 650 and 750 are the DDR3 or DD5 versions, which are completely different (MBP uses the DDR5 and it's much faster, more like a 660).
 
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