Sandy Bridge's IGP is about as powerful as the desktop version of the HD 5450. In the review below an i5 2500k using IGP and beat an i5 2500k with a dedicated HD 5450. However, it also looses to a dedicated HD 5450 in some benchmarks as well.http://www.anandtech.com/show/4083/the-sandy-bridge-review-intel-core-i7-2600k-i5-2500k-core-i3-2100-tested/11
Additionally, laptop video card are slower than their desktop counterparts. For example, based on some benchmarks of the Mobility HD 5850 that I've seen, it looks about the equivalent to a desktop HD 5770. That's a relatively large drop in performance.
It is my conclusion, that the IGP in Sandy Bridge is at least as powerful as the Mobility HD 5470. Additionally, the Intel i7 2630 is more powerful than the AMD Phenom II.
Sorry, but I don't know how the GeForce 310M relates to the desktop version of the HD 5450.