Not to go too off topic here, but that's a matter of personal preference. You don't NEED a 290 to game, but when you're playing BF4 a higher end card like the 290 makes a very noticeable difference.
You have every right to your opinion though
No, it makes almost no difference. It is overkill. You should consider quitting gaming and just focus on mining, just a suggestion.You have every right to your opinion though