I have the same question, my laptop details are DELL 1720; Chipset: Intel GM65 or PM965 Express Chipset.
Would there be any noticeable increase in speed or performance moving from the T7500 to T9500?
I am considering upgrading to a Solid State Drive and installing Windows 7, both of which I have determined would be cost effective measures to keep this laptop functional.
The CPU, not sure about that as they are still pricey!