R9 280x + Arctic Accelero - Temps too high?

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http://hardforum.com – So, I bought an Asus R9 280x, and felt that the stock cooler was too loud, so I went and bought an Arctic Accelero 7970. I messed up the first time that I tried to install it and briefly lifted up the HSF from the video card, but I was very careful the second time and used a very even layer of thermal paste. Right now, I'm seeing 48 degrees at idle, and a brief gaming session brought temperatures up as high as 69 degrees. I only played a half hour or so, since I don't want to push it with a possibly incorrectly installed HSF, but this may just be how it is. Is anyone experienced with th (Hardware)