today i wanted to buy a new video card wich will run tf2 in high speed, i go to the shop, then shopkeeper said to me, the pc you have doesnt support these types of card, you have to buy a "pc express" that support nividia cards, my pc looks like this
and he told me you cant insert the card because the spot is different and the card also doesnt look like you can put it in, i need to know what is this pc express, and if there are any nividia cards supportable for my pc, i need help finding a good graphics card to play tf2 on my pc