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UBT - Ben

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Message 27596 - Posted: 12 Jul 2009, 19:47:39 UTC

I have tried searching the forum for an answer to this, but as yet i haven't found anything which can help me.

Scenario:
Vista x64
2 x HD4850's (Single Cards)
Drivers installed and files copied
Latest MW application being used (v.f by Gipsel)

The problem is that i can crunch fine on the 1 card, however when the 2nd card is in, BOINC won't crunch on it (GPU-Z reports seeing both cards). I plugged in a DVI->VGA adapter into the back of the second card to hopefully fool it into thinking that a cable is plugged in (although I'm not sure if that will be enough resistance).

Is that the problem, or have i missed something which is making the 2nd GPU not work correctly?

Thanks to anyone with any input on this.


Confused cruncher...
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Profile The Gas Giant
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Message 27602 - Posted: 12 Jul 2009, 21:38:25 UTC - in response to Message 27596.  

I have tried searching the forum for an answer to this, but as yet i haven't found anything which can help me.

Scenario:
Vista x64
2 x HD4850's (Single Cards)
Drivers installed and files copied
Latest MW application being used (v.f by Gipsel)

The problem is that i can crunch fine on the 1 card, however when the 2nd card is in, BOINC won't crunch on it (GPU-Z reports seeing both cards). I plugged in a DVI->VGA adapter into the back of the second card to hopefully fool it into thinking that a cable is plugged in (although I'm not sure if that will be enough resistance).

Is that the problem, or have i missed something which is making the 2nd GPU not work correctly?

Thanks to anyone with any input on this.


Confused cruncher...

You need to set up BOINC so it thinks it needs to crunch MW all the time. With my 2 cards, if MW hasn't got enough debt, I see BOINC using only one card until enough debt builds up that it needs to use it to satisfy the debt requirement. So set up BOINC with a high MW resource share. I use atleast 50% overall.
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Profile borandi
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Message 27628 - Posted: 12 Jul 2009, 23:38:02 UTC - in response to Message 27596.  

That's not his problem GG - just that MW is crunching on one card only, not that BOINC is not getting enough work.

Ben:

Use Cat 8.12

Disable crossfire

Use dummy plug. (or extend the screen and make second screen primary monitor, as detailed here)

GPU-Z should show both as crossfire disabled, and both working 70%+

No special config should be needed for app_info.xml

Also, for the record, GPUs doesn't have an apostrophe, unless you are describing a feature, e.g. the GPU's colour. Same goes with CPUs, DVDs, TVs, PCs. </grammar>
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Message 27654 - Posted: 13 Jul 2009, 8:44:14 UTC

Thanks, borandi. It needed to be said.
I too am an apostrophe nazi.
Cheers,

PeterV

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Profile Glenn Rogers
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Message 27657 - Posted: 13 Jul 2009, 9:15:33 UTC
Last modified: 13 Jul 2009, 9:15:57 UTC

"Picky Picky Picky"
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Message 27667 - Posted: 13 Jul 2009, 10:13:58 UTC - in response to Message 27657.  

"Picky Picky Picky"


See it too often (I visit too many PC forums) and it's basic English at the end of the day.

Thanks, borandi. It needed to be said.
I too am an apostrophe nazi.


I currently admin a one-month old facebook group of 38500 fans on this, spelling and grammar. Maybe I take it too far, maybe I just get annoyed easily, maybe I want people to 'lern the write way 2 spel'! =D Unfortunately, as many of us as there are out there wanting to correct, there's ten others who really couldn't care less.
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Message 27668 - Posted: 13 Jul 2009, 10:24:56 UTC

... and what's more they probably weren't even taught to spell in school.
Cheers,

PeterV

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UBT - Ben

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Message 27671 - Posted: 13 Jul 2009, 11:06:42 UTC - in response to Message 27628.  
Last modified: 13 Jul 2009, 11:08:15 UTC

That's not his problem GG - just that MW is crunching on one card only, not that BOINC is not getting enough work.

Ben:

Use Cat 8.12

Disable crossfire

Use dummy plug. (or extend the screen and make second screen primary monitor, as detailed here)

GPU-Z should show both as crossfire disabled, and both working 70%+

No special config should be needed for app_info.xml

Also, for the record, GPUs doesn't have an apostrophe, unless you are describing a feature, e.g. the GPU's colour. Same goes with CPUs, DVDs, TVs, PCs. </grammar>



I have been using Catalyst 9. something for a little while now and it seems to work fine, however if it defiantly causes problems with using dual gpus then i will roll back.

When i installed the cards i didn't have a crossfire cable to link the cards, which is OK as i have read somewhere that you couldn't use them (just like CUDA in dual configuration). GPU-Z reports crossfire is disabled.

I still wonder if the DVI -> VGA converter in the back of the 2nd card is not fooling it into thinking it has actually got a cable stuck in the back. Anyone got some good links for a dummy plug?
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Message 27676 - Posted: 13 Jul 2009, 11:59:24 UTC - in response to Message 27671.  

My 4850X2, or 2x 4850 setup, uses Cat 8.12 no probs (the 4850X2 requires Cat 8.12 from Sapphire itself, as ATIs 8.12 on its own doesn't work).

As for a dummy plug:

http://www.overclock.net/overclock-net-folding-home-team/384733-30-second-dummy-plug.html

You need the resistors. Just a DVI <-> VGA plug on its own doesn't do it.
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Message 27681 - Posted: 13 Jul 2009, 12:42:37 UTC - in response to Message 27667.  
Last modified: 13 Jul 2009, 12:48:38 UTC

Fair "enuf" mate, he he...Know what your saying it does get hard at times to decipher what has been written... By the way good job on setting up the "destructions" for the ATI cards, should make life a little easier
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UBT - Ben

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Message 27687 - Posted: 13 Jul 2009, 16:09:49 UTC - in response to Message 27676.  

My 4850X2, or 2x 4850 setup, uses Cat 8.12 no probs (the 4850X2 requires Cat 8.12 from Sapphire itself, as ATIs 8.12 on its own doesn't work).

As for a dummy plug:

http://www.overclock.net/overclock-net-folding-home-team/384733-30-second-dummy-plug.html

You need the resistors. Just a DVI <-> VGA plug on its own doesn't do it.



Ah cheers. Thought that might be the problem! D'oh
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Message boards : Number crunching : Setting up s GPU's

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