   Texture arrays perfomance
  greetings....i have some questions about texture arrays.iam working with directx 11 and wonder whats the perfomance on texture arrays.is the performance different when i create an texture array with 20 textures or 100 textures ?and whats about when i want to update one of the textures in the array ?is the performance different compared to a single texture when i want to update it ?background is that i want to use a large texture array in my vertex shader for vertex texture fetches.based on 'w' value of the texture coodinates i want to index the texture needed for vertices to displace the Y value.the minimum hardware level i want to support is 10.0, 10.1 and 11.could i get any problem when i try to use texture arrays ?ofcourse something like: "works great on ATI but not so good on NVDIA." etc..thanks for reading....   
  That sounds like an unusual combination. I think you best option is to try it out and see if it's fast enough for what you need it for.If you're lacking in test hardware you could post a small benchmark program for people to try.Here's some vertex texturing benchmark results I found with a quick search: http://ixbtlabs.com/articles3/video/juniper-p10.html   ;  thank you for the link.i will try to setup some test on the weekend and look if i get something running.