Crossfire setup. One GPU very hot! Restricted airflow...

[crazyates]

Ah gotcha. Those Sapphire 5830s and 5850s used the same cooler, so I'd still be interested to know if removing the shroud helps at all. Check your paste while ur at it?

[MrTeal]

Double spaced you're going to run into issues with one card being much hotting than the other. There's a few things you can do, some that have been mentioned already.

1. Put in a spacer to force the cards apart as much as possible.
2. Turn off crossfire in the ATI control panel when you're not gaming and change the clocks independently. Run the top card at something like 700MHz Core, 200MHz memory and 1.05V to keep the power draw down.
3. Make sure you have good airflow in your case.

I have a pair of 6950 1GB with unlocked shaders running at 900/200 in my main PC, and they hash like champs when I'm not using it to game. Just get lots of fresh air into the case.

[crazyates]

2. Turn off crossfire in the ATI control panel when you're not gaming and change the clocks independently.

I run all 3 of my 5800 cards with crossfire enabled, and CGMiner adjusts the clocks, mem, and VDDC independently. Is this different for 6XXX series cards?

[oldDirty]

CF enabled does NOT affect the GPU temp.
You only get low temps with TWO importend things;
Do lower the Voltage
and
Do ensure good airflow to your Case.
And check the thermal compound like i comment before.

[MrTeal]

2. Turn off crossfire in the ATI control panel when you're not gaming and change the clocks independently.

I run all 3 of my 5800 cards with crossfire enabled, and CGMiner adjusts the clocks, mem, and VDDC independently. Is this different for 6XXX series cards?

I find I can't independently adjust the mem clocks down to 200MHz with CF enabled. It's notoriously difficult to break the link between core and memory speed on the 6xxx series cards though. It might be possible to clock each card independently and get mem clocks low with CF enabled, but I can't seem to get it to work.