I'm looking to build a new PC for work, really spec'ed run three pieces of software: ArcGIS, USGS's ISIS, and some custom crater-detection software. For the latter two, I already need to have a fast processor and max out the RAM. What I don't need for either is a GPU.
My question is, what use does Arc make of the GPU? I couldn't really tell anything from ESRI's system requirements page. For example, does it do any hardware acceleration? Use CUDA? Or would the on-chip GPU run Arc just as well as a $500 GPU?