Acceptable temps for Radeon 6570?

[Rio Rebel]

I have a Radeon 6570 whose fan is making too much noise, used in an htpc. I removed the fan and left the heatsink, and have two front fans that aren't right on it but at least blowing in the direction. For web browsing and general light use, it seems to stay around 41-43 celsius. I haven't started experimenting with the temps after playing a video for long periods of time. I have no intention to ever game with this, but want it to be able to play mkv movies.

Around what temperature should I start being concerned to operate for a significant period of time?

 

[Rio Rebel]

I just found the Anandtech article on this card. It looks like it goes up in the 80's even with the fan, so if I stay under 80 I'm thinking I'm solid.

Okay, back to my Fleetwood Mac video now. "Listen to wind blow....watch the sunrise..."