i think 490 is a high core , ur mem core seems fine, try 440. Cores always messses up.
My 2 cards are currently running at 490/1100. I went with these clock-rates for the time being since eVga sells a superclocked version of the card with those exact clock rates. I've had the card running at 525/1.2 on stock cooling long enough to benchmark it and didn't have any problems or high temps.
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