2 or 3 WU's On A GTX 470


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Message boards : Number crunching : 2 or 3 WU's On A GTX 470

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Saaby900T
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Message 1075778 - Posted: 10 Feb 2011, 9:32:36 UTC

What is the number of WU to run to max out RAC?
Also I've tried the search button so none of that crap plz. I couldn't find a thread that gave a solid answer.

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Message 1075780 - Posted: 10 Feb 2011, 9:42:33 UTC - in response to Message 1075778.

There is no definite answer to this one.

But we can presume this would be the most accurate, run 2 WU's if you run the card at stock clocks and if you OC your graphics card you can try to run 3 Wu's.

What you can test if you are into OC'ing is to see if PCI-E speed has a remarkable impact on crunching speed.

For instance if you run three WU's at once in a OC configuration on the 470 you would perhaps get around 23 to 24 minutes for a bunch of 0.4x AR wu's..
Then go to the bios and try to set PCI-E speed to 110 Mhz instead of 100 (Don't set it much higher than that) and see if you lower your times to perhaps 22,3 - 23,3 minutes for the same 0.4x AR wu's..

If the difference is negliable then set it back to 100 because then you've made a proof of concept test that shows that setting the PCI-E speed gives you a speed boost to the GPU operations or perhaps not.

Hope you get some ideas of direction for a better throughput.

Kind regards Vyper

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Saaby900T
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Message 1075783 - Posted: 10 Feb 2011, 9:51:18 UTC - in response to Message 1075780.

There is no definite answer to this one.

But we can presume this would be the most accurate, run 2 WU's if you run the card at stock clocks and if you OC your graphics card you can try to run 3 Wu's.

What you can test if you are into OC'ing is to see if PCI-E speed has a remarkable impact on crunching speed.

For instance if you run three WU's at once in a OC configuration on the 470 you would perhaps get around 23 to 24 minutes for a bunch of 0.4x AR wu's..
Then go to the bios and try to set PCI-E speed to 110 Mhz instead of 100 (Don't set it much higher than that) and see if you lower your times to perhaps 22,3 - 23,3 minutes for the same 0.4x AR wu's..

If the difference is negliable then set it back to 100 because then you've made a proof of concept test that shows that setting the PCI-E speed gives you a speed boost to the GPU operations or perhaps not.

Hope you get some ideas of direction for a better throughput.

Kind regards Vyper


Well I have a pretty Good OC going on it. 780/1560/1780 core/shader/Mem. I've never thought about adjusting the PCI-E bandwidth. Thanks for that hint. Well right now 2 wu seems to be a 7.5min a WU and 3 seem to at 7.6 min a WU but I've only be running 3 for an hour or 2.

Kevin Olley
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Message 1075821 - Posted: 10 Feb 2011, 15:55:12 UTC - in response to Message 1075778.

What is the number of WU to run to max out RAC?
Also I've tried the search button so none of that crap plz. I couldn't find a thread that gave a solid answer.


The last time that I checked I was crunching more WU's over a fixed period of time when running 3 WU's per card, drivers can also have an affect on processing speed.

What I have not checked but have noticed that since upgrading this machine the speed of my CPU WU's has been affected, my CPU is processing less work because of increased demand from GPU's.

Kevin



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Message boards : Number crunching : 2 or 3 WU's On A GTX 470

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