Well, as much as others told you, it'll work wonders as long as you get a decent system supporting it.
I honestly don't get why people even goes for over 8GB when they're more than enough for gaming right now, or for gold/platinum PSUs when bronzes are much more affordable and work as well on single-gpu systems with enough headroom. Unless someone plans on heavy overclocking, I feel it's unneded, and more than everything it just goes into "bragging rights", but whatever, it's up to everyone's tastes I guess 😛