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If you want to buy a card faster than GeForce 240 GT or Radeon 5670, the radeon cards are a bit faster and consume much less power. In next few month nVIDIA will release their "Fermi" cards which might be better then the radeon 5000 series.
ATI cards of the radeon 5000 series support DirectX11 the current nVIDIA cards have not support for DirectX11.
@Fenrin ... thnx buddy, but what about performance? which is better radeon or nvidia? coz some ppl says that nvidia got better performance than radeon, also nvidia got physX ... which i realy dont know what does it mean
There is no clear winner. Generally, the current ATI cards are faster, but in some games, it can be that NVidia is faster due to PhysX. Also, NVidia cards that perform as well in the majority of games as the equivalent ATI ones are more expensive.
However, future DirectX 11 games will be able to use something like PhysX on ATI cards too, because DX11 provides an equivalent to PhysX that will work on all cards. However, no such games exist yet since DX11 is simply too new.
Also, if you want to wait a few months for the new NVidia cards, you should be aware that they will be really expensive.
1 more question guys ... what r z most important items in choosing a VGA card ... stream processor or mem bus or memo type or memo speed or what? chosing VGA card depend on what mainly???
Well games years ago used to care about pixels/s but since DX9 and DX10 took over you can pretty much figure out exactly how it's going to do by it's texel/s benchmark. Some games seem to like shader speed others don't care. Core frequency is directly related to texel/s frequency. Wow and sims 3 kind of games do alright on about 5 to 10 gtex/s. Bit more demanding games do alright on about 10 to 20 gtex/s. Hardware breakers are pretty much getting devoured by the 40gtex/s and up cards. Ram throughput is nice but when cards are doing so many texture operations a cycle it's really not that big of a deal.
A card that can do 10 gtex/s at 500 mhz will do 20 gtex/s at 1000mhz but if your game needs 30 then you really haven't gotten the job done. Think of it like hot loading bullets. If your hotloading a round that almost gets the job done then fine. If your hotloading .380 acp to hunt elephants then it's kind of silly.
DX11 though is dumping the texel/s trend. They take all the super high quality textures that years and years and 4 generations of GPU's struggled to be able to throw around and just blurring them to high heaven and then tesselating them to rediculous levels. But you can count on texture quality in shipped games not going down as long as there are so many DX9 and DX10 gpu's around. 2nd and 3rd generation dx11 gpu's will likely just be tossing out texture mapping units for more shaders.
hey guys ... after i done my search comparing ati cards & nvidia cards, i found that nvidia care more bout the memory bus of the card, however ati radeon care bout stream processor, mem type (GDDR5) and mem. clock
finally i decided 2 get z ATI Radeon HD 5770, is there any nVIDIA card better than that??? or any 1 got a suggestion for me?