Aslong as you removed your old drivers first and installed the latest nVidia drivers then yes, the game should set the video settings to what it believes is right for your computer.
However it is often worth fiddling around with these settings as usually the settings will underestimate your...
Laptop graphics cards are physically soldered onto the main board so unless you have one of the recent alienware laptops it is likely that you will not be able to upgrade to a better video card on your laptop.
I don't even think ATi make a 9600XT mobile chip.
Yes, that would work, but make sure you delete all remenants of the old drivers before changing (especially if your changing to a different chipset as well).
My last motherboard change I went the non-reformat route but encountered numerous problems and conflicts, even though I thought I had...
A 6800gt is fine as it is easily clocked to an Ultra, and you don't need to flash it like with the X800. The ultra also performs ever so slightly better due to its constantly improving drivers.
If you can stretch a Athlon64 2800+ with a motherboard would be fantastic and you would see a huge improvement in how you play your games. I think 2800 and a mobo would be about the $250 mark though.
edit: Just specced the 2800 with the mobo in my sig (the epox, very good imo) and it came to...
Your best bet is replacing the heatsink altogether, as WaryWolf suggested. Its a very easy to install and if you keep the old heatsink it means your warrenty remains in tact ;)
looks good, but you do not need the registerred ram, it will slow your computer down, and is more expensive. Normal 3200 is fine, and if you do not want to overclock then corsair value is also fine.
EVERYTHING!!!
seriously though, compatability issues, don't expect all your games to run like before. Stability as well. Lots of other things as well but i cant be arsed to list them.
*sigh* if only Micro$oft learnt how to release an OS update like Apple.