Is it better to buy N card or A card for graphics card? What kind of game is good?

The current platforms are mainly 3A platform and IIN platform, namely amd chipset +amd processor +ati graphics card and intel chipset +intel processor +NVIDIA graphics card. It can be said that within 6000 yuan, choose 3A, and above 6000 yuan, choose IIN. Now NVIDIA's DX 1 1 graphics card fermi is too expensive, which is not as cost-effective as ATI's 5 Series. N cards are never affordable. Is the physical acceleration of N card NB? In fact, there are less than 20 games that support phyx, and A and N are the same. amd is very concerned about graphics card drivers and updates quickly. NVIDIA card is not recommended now. NVIDIA DX 1 1 doesn't have a low-end graphics card, and GTS250, the mainstream graphics card of DX 10, is about to be delisted. It is a tragedy to buy it. The price of GTX 260 is too high, so it is better to buy ATI 5770.6000 yuan or less. 3A platform and INN platform are cheaper under the same performance.