$200 Budget Which Vid Card?

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I have to disagree

There is barely any difference between 320MB and 640MB even in DX10 games

Did you see Bioshock benchmarks ?

http://www.techist.com/forums/f15/bioshock-benchmarks-firingsquad-152465/

Take a look at COJ benchmarks....the 640mb clearly outperforms the 320mb
[H] Enthusiast - Call of Juarez DX10 Performance and Image Quality

In DX9 we saw that overall the 320 MB GeForce 8800 GTS trailed everything by a large margin. However, once we ran the game in DX10 mode the 320 MB GeForce 8800 GTS dropped the ball and started lugging around the 5 FPS mark. In the game it was extremely choppy for us and it felt like the game would speed up then slow down then speed up then slow down. This feeling we got makes us theorize that the game was filling up the video cards memory and running out of space thus texturing out over the PCI-Express bus, and the PCIe bus is nowhere near as fast as local memory.

This means with a 320 MB GeForce 8800 GTS you will have to run the game at a low resolution in DX10, We found 1024x768 was the highest we could go with acceptable performance in DX10 mode with the game settings at the highest. The 640 MB was playable at 1280x1024 and the GTX and Ultra at 1600x1200. We know it is memory related because the 640 MB 8800 GTS is the exact same GPU and it did extremely well in comparison. The 512 MB Radeon HD 2900 XT also did well trading blows with the 640 MB GeForce 8800 GTS in DX9 and DX10.
 
Also take a look at Lost Planet benchmarks
[H] Enthusiast - Lost Planet Performance and DX10

There was a distinct playable difference between the 640 MB and 320 MB GeForce 8800 GTS in this game. We had to lower the lighting quality to “Medium” with the 320 MB model as well as turn off Motion Blur in order to get acceptable performance. With the 640 MB model all we had to do was turn off Motion Blur, we did not have to lower the lighting quality. This matches the apples-to-apples testing where it showed a distinct performance difference between the 640 MB and 320 MB GeForce 8800 GTS.
 
But thats one website claiming that

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coj_hdr.gif


X-bit labs - Fast and Faster: MSI GeForce 8800 GTS 640MB vs. GeForce 8800 GTS 320MB (page 9)
 
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