I'm have no idea about laptop CPU sockets. I assume it's identical socket and it's as simple as take out T3400 and replace with T7500 am I correct on this? The laptop I'm going to do this is my wife's cheap toshiba laptop that I got for her like 3 months ago and I might inherit T7500. Will there be noticeable difference when transcoding DVD? Speed seems almost identical(.04GHz difference I think) and T7500 has 4MB cache instead of 1MB(I think) on T3400.