Similar spec processors, very different Windows Experience index

[idata]

I have a desktop which I have had almost 3 years with a C2D E6600 2.4GHz processor. I recently did a clean install of Windows 7 home, and immediately checked the Windows Experience index, for which my processor returned 4.8

Yesterday I acquired a new laptop, with a C2D P7570 2.26GHz processor with Windows 7 Professional, and got a processor score of 5.9.

Now I don't understand the technical details of processors to any degree, yet comparing the spec of each, they appear very similar on paper, so why would the E6600 give me such a low score compared to the P7570?

[idata]

The P7570 is 45 nm but even so can't think that would be it.

Run SiSoftware Sandra to compare your E6600 with whats listed and get some real numbers.

http://www.sisoftware.co.uk//?d=dload&f=sware_dl_3264&l=en&a http://www.sisoftware.co.uk//?d=dload&f=sware_dl_3264&l=en&a=

[idata]

I couldn't remember why I didn't have Sisoft Sandra installed on my PC, and after downloading it and trying out a benchmark, it crashed my PC. Now it's deleted again.