I am looking to upgrade my video card. I am drawing a lot in 3D using autocad. I am going to start drawing in Plant 3D and also I do some inventor. My issue is that when I render my models in Autocad it lags big time. It's to the point that I am scared to rotate my model because it may crash. I am running a Dell 8300, Intel Core i7-2600 CPU @ 3.4 GHz (4 cores, 8 logical processors), 64 Bit windows 7 w/12 GB Ram,. I think the culprit is the video card, which is a AMD Radeon HD 6700. I have checked specs and not sure what to do. I was thinking off upgrading to the Nvidia Quadro K2000 which is recommended here (http://www.pugetsystems.com/labs/articles/AutoDesk-AutoCAD-2013-GPU-Acceleration-164/) and it's certified by autocad. According to this other site though it has the AMD Radeon pretty high on the benchmarks, http://www.videocardbenchmark.net/high_end_gpus.html. Of course you cant go just off benchmarks because precision is more important in what we do than speed.