packard bell i connect 1275 model?

I don't know for certain, but I doubt it very much. My experience of working on Packard Bell PC's is that they are not the most flexible in the world:

http://support.packardbell.com/uk/

I certainly wouldn't invest in a new processor unless I had some certainty it's going to work. PC World distribute them and have in-store advice centres - you may wish to ask there.

Laurence Mullikin
March 2004