I have two slots of memory which is one slot is my old 2gb RAM, that's mean i only have one empty slot, i want to add new 4gb RAM, will it be more faster?
If the RAM is compatible with the system and plays nice with the old stuff, you should have a slightly faster system, yes. Because it won't be off-loading data to and from the hard drive (virtual memory) as much if at all.
Two modules that have never been tested before carry no guarantee that they will work together or how they will work together. You are free to do your own testing.
Two modules that have never been tested before carry no guarantee that they will work together or how they will work together. You are free to do your own testing.
If the RAM is compatible with the system and plays nice with the old stuff, you should have a slightly faster system, yes. Because it won't be off-loading data to and from the hard drive (virtual memory) as much if at all.