Just recently installed Palit GTS 450 1gb DDR3 runs 30 deg C and quiet when idling but running crysis 2 fan gets very noisy and seems to reach 80deg C , is this normal or am i likely to be damaging the rest of the system ??
You're in normal temps there. As greghome says, be sure to get good airflow through your case. Intakes one end, exhausts the other, so you get a consistent direction of flow. Also download MSI Afterburner to manually set the fan speed to a more aggressive curve. This will result in more noise, but your GPU will stay cooler. Though NVidia cards mostly have their cooling set just right.