I think the main issue with the 5GB or Vram is that it inflates the price, If you look at the cost of 670. The cheapest 2GB model sell for 370 while the cheapest 4GB sells for $440 so about $70 difference. So if they were to have a 780/titan LE or what you want to call it has a reference model with 2.5 GB for $70-75 cheaper while still having the 5GB model out there I think a lot more people would be happier or at least would consider upgrading.