The fact of the matter is that nvidia sold us a lie. The differences may be minor to non existent in some games but in the dying light as soon as l went over 3.5GB I had shuttering and sudden frame drops from 60fps to 15-24. When I dropped the textures down a setting my frame rate was consistent and had no shuttering and my frame usage was around 3GB.
Nvidia think they can just brush this under the carpet but I hope they pay dearly for it. This has harmed their reputation immeasurably in my eyes. Lying about specifications like this is terrible and a driver fix will not fix it, this is a hardware issue.
Since my product was not as described and given the high price of the purchase I am/will be asking to be refunded. Nvidia must respond to this officially and apologise.
Nvidia's closed hardware ecosystem and even game works are things I can live with but these flat out lies are things I cannot abide. I consider honesty to be a very important trait, and I don't know if I can trust them with any personal hardware purchases in the near future.