Is 280x (26K vapor x edition) enough for gaming at 1080p ULTRA specs for games like watch dogs, shadow of mordor or i need to increase the budget and get 290 for 36k or 290 is overkill for 1080p? Current specs: i5 2500k OC to 4.0 ghz, 8Gb sniper ram, 7850 2Gb, 620 seasonic psu.