I've got a Radeon HD6870 (Powercolor) and It's only been running for about two weeks, I haven't noticed anything wrong with it at all, but it does get a bit hot for my liking, GPU-Z reports:
Temp 1: 68.5C
Temp 2: 79.5C
Temp 3: 77.0C
Is this normal? No overclocking, I just want to know if anything will happen due to these temperatures, as I am an avid gamer on this PC.
GPU Core lock is at 900MHz and the Memory clock is at 1050mhz, getting 250-270MH/s
Underclock your memory, as much as you can. If wont hurt performance (on the contrary actually) and it will lower temps a little bit. Even so those temps are uncomfortably high IMO. Try to improve air flow in your case or speed up your fan. If your card supports it, you can also try reducing voltage.
How low would you recommend, stock is 1050MHz
Also, improving airflow is out of my range since I've only got one card and I've got a couple 1300RPM fans pointed right at it, 95 CFM each, they move a lot of air.
My fan has been spinning at 100%. Powercolor is very bad at cooling. I would buy a new heatsink for it, but it voids the warranty, and this card may be one of the defective ones they sent out this past couple months.
Edit: I downclocked the memory to 900Mhz and noticed a significant temperature drop. GPU-Z reports:
Temp 1: 61C
Temp 2: 71C
Temp 3: 68C
How much lower can I go without anything bad happening?