I am using the ATI Radeon X1400 Hypermemory 256MB (really though it is only 128MB dedicated to the video card, while the other is shared...that is what Hypermemory means from what I undestand), anyways it works great. I also have a duo core 1.6GHz with 2 GB Ram so that helps to. I do have to tone down the settings a bit though, especially on 3D fields which I am not a fan of anyways. Either way the sim is flying and looking great.