Hi Gents
Just want to report a possible bug here of some kind.
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But if I use CGMiner to clock my cards, I am getting significantly less performance
like 20 Mhash per card difference (total of 3 cards in machine)
I'm using WinXP with 11.6 and am using it to overclock a Radeon 5770 and 5830 to 950Mhz and underclock the memory to 300MHz and I verified that the settings took with GPU Shark. I could not do that with the ATI CCC. And my hash rate has improved by 60 to 70Mhs for the pair of GPU's.
Sam
Well for one thing ATI CCC is completely useless IMO anyway.
But
Hi Gents
Just want to report a possible bug here of some kind.
Here is what I am running.
Windows 7 64x
Cgminer 2.0
AMD 11.8 Drivers
(I have been running cgminer since 1.5.something and I am a HUGE fan)
CGMINER 2.0 Has Same Great Mining performance as 1.6.2 if I clock the cards with my own util (Saphire Trixx or MSI Afterburner)
/
But if I use CGMiner to clock my cards, I am getting significantly less performance
like 20 Mhash per card difference (total of 3 cards in machine)
I am 100% positive I am using the correct syntax to clock the cards at command line
and its the same if I go into the program and use CGMiner to clock them manually
it does not matter if I have auto-tune features on or off, I know the developer is a linux guy, but has any one run into this issue yet? I would love to be able to use cgminer to clock my cards and start mining with a nice batch file (more time for madden 2012)
Any Ideas?
Cgminer cannot down clock the memory as much as MSI Afterburner or Trixx on some cards. So if that is happening and you do not have enough power you may be exceeding the power you need to get a steady Mhash out of you cards. That is what happened to me anyway.
The developer tells me it is because he uses the ATI stuff to change settings. MSI Afterburner and Trixx bypass the ATI stuff and change some settings on their own directly.
you may have an interesting point on that cgminer cannot downclock the memory, is it because it cant downclock past 300? You could be right. I was trying to downclock my mem to 180 which is the ideal spot for the cards I was testing this on.
I dont think it has anything to do with power though, this rig has a corsair 1200 watt PSU
but I bet your right on with the downclock thing
ckolivas: can you verify that CGMINER can't downclock mem past 300? This would be a feature I would very much like. I know the main stream thought is 300 is the sweet spot for mem, and I think this myth exists because it is the lowest point you can downclock in some early versions of software.
In any case I have 9 GPU's and have been mining since BTC was worth 0.85 USD - my point being?
I have thoroughly tested these cards every which way possible, and although 1 of my cards prefers 300 for memclock (my xfx 5830 which I hate BTW) all my 6870's and 5870's LOVE 180 plus I am getting some energy savings there (even if its not a lot it adds up)