thanks for the reply
my room temperature is ~25c.
What is "model no."? my card is Sapphire ATI/AMD Radeon HD 6670 1GB (Hyper memory edition). It's specs are not given on sapphire website. Here is the link for video review of this cardhttp://www.youtube.com/watch?v=eTlk6NWcANk
No, i am not overclocking this card.
I checked the card temperature using HWmonitor.
I dont have additional fans in the case. there are default 3 fans (1 for cpu, 1 for gpu and 1 in psu)