memory upgrade

It depends on what you're running at the moment. If all running processes use less than a gb, it doesnt matter how much physical ram you have installed.

kf10 said:

i upgraded laptop RAM from 1GB to 3GB and it made no difference in computer performance, not even 1%.....................

Adding more memory will not 'boost' your performance, it only allows you to run more applications at the same time. :)

arkhi said:

You should have bought the exact same Memory spec as your 1GB so you could have achieved dual-channel support.

dual chanel nowadays almost (1-3%) dont give any performance increase over single chanel, same quantity.
so nothing is gained from dual chanel.

Adding memory was never about performance, unless your system was being severly chocked before. If you have a high end system with 1 GB of memory, I guarantee you'll see a performance increase in a current game if you went to 4 GB. However, that's a unique situation. On something like a laptop or a netbook, where you are only using mild, office/web applications, you may see the OS perform a little snappier, but that's about it. Web browsers won't suddenly open faster. The system will be more responsive under a load, that's all.

arkhi said:

You should have bought the exact same Memory spec as your 1GB so you could have achieved dual-channel support.

And one more time, the memory dfoes not determine whether it runs in dual (or triple for that matter) channel, it is solely dependent on whether the chipset/memory controller supports dual channel.