Actually Physics is to help the cpu to decode and calculate the
'physics' in the game like when the object is falling, so
your game will be more realistec. If you let the cpu calculate the
algorithms, and you turn up your resolutions higher, there might be
some lag, because your cpu is handling more task.
In the past, people will buy a physics card to calculate the
physics, releasing the cpu from some stress, but now nvidia got the
card to work in their gpu, so when people buy their gpu they also
have a physics, so is kind of like marketing
To me using a physics and no physics there is not much of
difference, you can go to youtube and search for nvidia physicsx
test and see
Maybe i am more of a fan of ati so i dun really like nvidia,
nvidia has their own techonology like CUDA, and ati have their own
ati atream technology.
I will say wait till your graphics card really spoils first then
you see whether you wan to get a new graphics card or a new
computer, maybe it is because you have too much background programs
running and that is why your system is slowing down?
If your gpu is too fast and your cpu is too slow, your comp is
slow. If your cpu is slow but your gpu is fast, your comp is also
slow, so what you wan is something that will work nicely.