cpu upgrade choice and compatibility


Feb 25, 2015
Hello I'm new to pc building and upgrading. I have a Compaq Presario cq56-115dx laptop. I'm giving it to my nephew and wanted to do a few upgrades. I've already added 8gb of ram and a 1tb 7200 rpm hdd. I was wondering what's the best choice for a cpu uograde. It has the s1 socket and currently has an amd v140 processor. I have done some research and know that it can supposedly handle the AMD Phenom II Dual-Core Mobile Processor N660, AMD Phenom II Dual-Core N640 , AMD Phenom II Quad-Core Mobile N970 , and the AMD Mobile Athlon II N370. I get confused at what's better the speed or number of cores?? They are all the s1/s1g4 socket and should be compatible with the stock motherboard. Please help. Thanks