DeepCool Tesseract

The space right ontop of my top exhaust fan tends to get reeeally hot during gaming , gpu goes up to 75 celcius idk if that's normal for a sapphire r9 390. Should i be worried that it's getting so hot , i've got 2 exhausts 1 top 1 rear , 2 intakes 1 front and 1 side. Case is DeepCool Tesseract...