Successfully unlocking additional cores will help in some games, namely those that are optimized to use more than 2 cores, it won't make a difference in older titles that are only designed to use 2 cores. It certainly can't hurt if the locked cores are good. The problem with core unlocking is often the locked cores were deactivated because they did not pass quality control, there is no guarantee that your CPU has 4 good cores.
I can't say whether it's the graphics card without knowing which card you have. A really old or really low end card may have trouble running Left 4 Dead on the higher settings. It would also help to know what resolution you are running the game at.
does that cpu good for Battle field 3??
ok but if i unlock the cores and the cores are defective ....what will happen?can i determine if it is defective or not??