Compute intensive stuff. In my case GPU rendering for 3D design being 3 GB the absolute minimum needed.
"buy a Tesla or FirePro" isn't an answer since any GTX or HD will beat them badly speed wise.
Lets design a GPU that is targeted towards gamers for the needs of Compute intensive stuff.
Doesn't really sound like a great idea does it? Just because YOU in particular want something, doesn't mean a company should set a baseline for you. It's a gaming GPU, no need to hit 6GB of ram. That just pushes up costs and cuts profit margins. The person who pushes for that relentlessly at AMD probably gets fired.