Single 970 ok. Added 460, not working so well.

It seems that a lot of GPU problems revolve around specific versions of drivers. Though NVidia has their own support structure, you can often learn from information reported by others who fold.

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Single 970 ok. Added 460, not working so well.

Postby SirMacke » Tue May 19, 2015 6:13 am

Running a Gigabyte GTX970 and as a single-card it folded ok.
Had an old GTX460 so I put it in the PC.

Problem now is that the 460 is getting 35k ppd and the 970 is getting 300-9k ppd.
Nothing like it used to.

I tried to change gpu-index, but to no change.
I have reinstalled the client and this morning i updated to drivers 352.86

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Re: Single 970 ok. Added 460, not working so well.

Postby JimF » Tue May 19, 2015 1:10 pm

To make a long story short, Folding doesn't work with dissimilar cards. They need to be identical in chip type (not necessarily board manufacturer) and therefore have the same number of shaders. And even in that case, when you install multiple cards, be sure to do a clean uninstall of the old drivers first. For that, Display Driver Uninstaller (DDU) is currently the favorite, but there are others.
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Re: Single 970 ok. Added 460, not working so well.

Postby 7im » Tue May 19, 2015 1:40 pm

In the example above, the point change has nothing to do with the addition of a second GPU. The reason the 970 PPD is down is because it pulled a core 15 work unit that has no bonus.

Fah does not require like chips to run well on multiple GPUs. However, running like families of chips (like all Keplers) helps to avoid potential driver conflicts.

Let the core 15 WU finish and see if the PPD goes back to normal on the next core 17 WU.
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Re: Single 970 ok. Added 460, not working so well.

Postby Joe_H » Tue May 19, 2015 1:47 pm

JimF somewhat overstates the issue, if he had said there can be problems with using two different cards that would be closer to the actuality. First, if you just added the 460 to an already existing F@H installation, it is possible that the client has misidentified which card is associated with each GPU folding slot. It is recommended that a full reinstallation of the folding client be done when there are hardware changes to GPU slots. In the meantime you can confirm whether or not the correct GPU is listed for each slot by pausing one and seeing which GPU is actually being used with a GPU monitoring app.

Second, as shown in your first picture, one of the WU's being processed is using Core_15. Wu's from those projects do not get the Quick Return Bonus, so the PPD will be lower on many GPU's. Also given the estimated time to complete, I suspect the WU is actually being processed on the 460, not the 970.

There are some how-to's posted on adjusting the GPU index values to get the right one associated with each slot, but I would recommend a full reinstall of F@H first after finishing your current WU's. Then if the index values are still wrong, follow one of the guides to get them set correctly.
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Re: Single 970 ok. Added 460, not working so well.

Postby SirMacke » Wed May 20, 2015 4:40 am

I have reinstalled the client to no use.
Both cards running at near 100% and it is the 970 that has got the slow PPD.
Wanted to play some Battlefield yesterday and I paused the 970 client to do so.

Will finish the WU and see what is happening.
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Re: Single 970 ok. Added 460, not working so well.

Postby rwh202 » Wed May 20, 2015 7:09 am

It looks like the client has still got the slots mixed (I've never had it work on windows in 20+ installations), but at least the assignment for the 460 is working as intended (core-15) - it's just a pity that it then gets run on the 970
Personally, I'd not try and fold on an old fermi and save the electricity - it will draw pretty much the same power as the 970 and at best do 1/20th of the work. Even just having it in the system will likely slow the 970 down by more than it could produce itself.
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Re: Single 970 ok. Added 460, not working so well.

Postby SirMacke » Wed May 20, 2015 9:35 am

Ok, perhaps pulling the 460 out.
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Re: Single 970 ok. Added 460, not working so well.

Postby 7im » Wed May 20, 2015 1:16 pm

Fix the index first and verify if the 460 is worth keeping or not. Fred has a good post explaining how.

fredfoobar's guide to sorting out GPU indexes
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