I'm choosing a new laptop and one of the questions is a type of CPU — mobile or ultra-low voltage. If to be more precise, I'm torn between two models of Intel Core i5 — i5-2410M (Sandy Bridge) and i5-3317U (Ivy Bridge). Here is a comparison table of these models.
According to official specs the first one has 2.3 GHz clock speed while the second one has only 1.7 GHz, that's about 25% difference. Is it really important parameter and which CPU is preferable for a laptop for development, running VMware virtual machine, media and internet purposes?