MSI Twin Frozr II series

Okay, not exactly what you were looking for, but close. This review of the MSI GTX465 Twin Frozr II tells you something about the cooler and special components used in the series. Since the clock speeds seem to be at reference, the charts showing relative performance between the GTX470 and HD5850 should be valid for the cards you mentioned above.
http://www.guru3d.com/article/msi-n465gtx-twin-frozr-ii...

That is a quite nice review. But comparing these two cards (I guess they used the stock ones) the performance shown is the same. I am wondering if the performance for the Twin Frozr II version of these 2 cards are the same, then we would have an nVidia Vs ATI challenge and I wouldn't know what to go for.

At least for the GTX465 Twin Frozr, the performance is identical to the reference model. I would say you can compare reference 470 to reference 5850, and those numbers should be the same for the MSI Twin Frozr versions. The cooler for each card is identical as well.

Do you play any games that feature PhysX? If so, the GTX470 features PhysX, while the 5850 does not.

I agree with that. I don't really bother too much about all this phys X.In that case I would buy a PhysX pci card, but without underestimating the power of the 470, it will be good to see what it's got.