Three things can immediately be done to improve cable management without much cost! First I would clean out the card even if it doesn't seem dusty on the fan blades could be full of dust on the intake or out take of the card. Second thing i would do is do your best to improve your cable management, fewer cables = fewer things to inhibit air flow. Last thing i would do would buy some thermal past take the fans off the card and place pea sized amounts of thermal paste on the chips where the old thermal paste was. You can buy some pretty cheap antec diamond thermal paste from your local staples
Oh one thing i forgot if all of those fail try running a program like msi afterburner and turning your fan speeds up to like 75 percent all the time. thats pretty drastic though and can be bad on the fan bearings on the card