Researching new boxes… Does the amount of video memory matter to SU? In case… is there a performance impact on a 2GB vs 4GB video card in a new iMac?
SketchUp can use hardware features to accelerate OpenGL, and the hardware generally benefits from more dedicated video RAM. However, you probably won’t notice the difference unless you create models with very large numbers of entities or large complex textures.
The recommended video memory has been 1 GB for quite a long time now, but I had no problems running version 8 on my previous laptop that had a 64 Mb Nvidia mobile card. Of course, my models are usually small, with few textures.