its not nice NV doing , but 970 is still a **** good card, not a single card is 4k proof really at moment in which case you need 4g ram whatsoever, and you need to take power consumption into consideration too. i do admit though (as a owner from 7870 to 970), that GCN architect has been holding really long and really well and NV practice these days is rather dodgy, and no I dont care about whether their VXGI will make its way to Unreal, proprietary stuff makes little sense to you average game project unless you are doing some pre-vis (in case it would be nice with a little touch of VXGI).