yes but first you have to remove your first card
OR, if your motherboard has another exact same slot and has either SLI or CrossFire capabilities, you can add another only the exact same card in to have almost double the GPU processing power.
Depends on the Graphics card with the PC
By upgrading the graphics card.
In order to know what the best graphics card a certain PC can handle we need to know the type of PC you are asking about.
The graphics card will be installed into your PC,so if 2 monitors are connected they will both have the graphics.
No. Not at all.
Yes, you will need a powerful PC not just a good graphics card to take advantage of the high end graphics. However you will still have to wait since GTA 4 has not been announced for PC.
Yes because a PC had a better graphics card than an xbox 360
You can not convert the RAM that is on the PC to RAM for your graphics card. The only way to get RAM for a graphics card is to buy one that already has RAM on it. The graphics cards that have their own RAM are normally higher end ones that cost about $50-$70 for the cheapest ones.
basically, without a graphics card your computer can operate but you wouldn't be able to see what it's doing.
It depends on your graphics card specifications and what resolution you run the game on
yes
Graphics Card if your a hardcore gamer