Use the ingame Anti-Alaising/ if you have AA off in-game because of performance simply open the FXAA Tool and click the box allowing the FXAA Anti-Alaising.
I would highly recommend overriding in game AA with the graphics control panel Nvidia/ATI under game profiles. I noticed a difference of around 25-30 frames and I was running (in Nvidia Control Panel)
SLI 8x with 8x SuperSample compared to in game AA settings 8x at 3 quality



Here is some pictures of FXAA and some without to allow comparisons.
Game Default

With FXAA

Game Default

With FXAA

Game Default

With FXAA

Game Default

With FXAA

Game Default

With FXAA

Download link
Instructions: just download, unzip and put the contents
injFX_Shaders
d3d9
dxgi
fxaa_readme
FXAA_Tool
shader
Into your NBA2K13 Folder. To make changes run the FXAA_Tool.
Pause button on Keyboard disables/enables FXAA.
















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