|Any yardstick about Virtual Memory being a multiple of RAM soon gets dated (even that from MS). The idea that "the more RAM you have the more VM you need" is illogical. It's when you are short of RAM that you need most VM (and vice versa).|
Let Windows manage it, as recommended by others. Don't worry about all the stuff you read about contiguous blocks either - the Min setting that Windows comes up with will look after that too.
Most likely you rarely use anything like the full amount of RAM, so increasing VM which is hardly ever used is the reason you noticed no difference.
There's a lot of old pogwash banded about on websites. If you want to tweak VM your first step is to take measurements of RAM and VM usage. Unless you are one heck of a power user this will simply confirm what I've said above.
some other bloke...