5970 problems. (cgminer + fan, Xp/7 compatibility)

[cmg5461]

I have two problems:
1) When I try to use autofan in cgminer with my 5970 and 6870 in the same computer, only the 6870 is controlled.  I haven't tried it seperately, but I feel this is a problem because the two  gpu's rely on one fan.

2) I have tried running my 5970 on a clean install of windows XP, with only the SDK driver installed and cgminer running, and I get some pretty erratic results.  One gpu runs fine at 320 mhash, but the other one runs at ~150 and racks up about 1,000,000 HW: errors/min.

Miraculously the 5970 runs perfectly stable at 850 oc & 1.03v in windows 7.

This is my face: 

[DeathAndTaxes]

On #1 I have found setting the fan to a high fixed value and then using auto-gpu to vary clock based on temp works better w/ dual GPU cards.  Then again I got my 5970s in the garage so I don't care how noisy they are.


On #2 why use Windows XP especially when you have access to Windows 7?

[cmg5461]

On #1 I have found setting the fan to a high fixed value and then using auto-gpu to vary clock based on temp works better w/ dual GPU cards.  Then again I got my 5970s in the garage so I don't care how noisy they are.

will try this, thanks

On #2 why use Windows XP especially when you have access to Windows 7?

I bought the OEM copy, so I can't transfer it. :/  Anyway I have XP on my rig.

[cmg5461]

Is there any possible chance it could be related to the power supply?  I have run the 6870 on that rig without a problem, however.

[DeathAndTaxes]

Very unlikely it is PSU.  PSU would hard trip and system would reboot without warning.

[cmg5461]

True, I'm just really curious what those "HW:" errors actually mean.

[DeathAndTaxes]

True, I'm just really curious what those "HW:" errors actually mean.

It means the GPU is failing to properly complete a hash.  It is aborting and returning pure garbage as a result.  Usually it means either a defective card or overclocking too hard.  The fact that it goes away w/ Windows 7 would seem to indicate that isn't the reason.