What is your room temp and is your case full of fans and what are the RPMs?
This from a quote on your case review:
"As a whole, the cooling isn't overwhelming. But it isn't substandard, and the fan clips make for easy changes."http://www.thetechlounge.com/article/469-2/Thermaltake-Soprano-DX-MidTower-Case/
That case is kinda lacking. Pay attention to another part of the review
"Behind the front bezel is a sizable 140mm intake fan that operates at inaudible speeds but moves very little air, which is in no small part thanks to Thermaltake's standard plastic (admittedly easy-to-clean) fan filter, on top of the constriction provided by the steel chassis and the front bezel's indirect air flow. It's enough for the hard drives, but I wouldn't count on it to pump fresh air across the expansion slots by the gallon. "
Open it up! Cut the back bezel out over the fan, get a wired fan cover, do what you can with the front.