Best Practices For Building A Multiple GPU System

[Tutor]

Tutor,

Thank you for your time. Points 1-5 done previously - not working. I think #6 is the key. BTW do you think that clean install of win10 means same as having proper (previously working) registry settings?

Smicha, can you stay for I bit or come back about 10 min. from now. I'm searching for something, but the simple answer to your question is "yes."

[Tutor]

Tutor,

Thank you for your time. Points 1-5 done previously - not working. I think #6 is the key. BTW do you think that clean install of win10 means same as having proper (previously working) registry settings?

Smicha, can you stay for I bit or come back about 10 min. from now? I'm searching for something, but the simple answer to your question is "yes."

The registry gets filled with data for each card that's installed. Because I move my cards around between my many systems, I've become adept at modifying my registries, such as by deleting entries for cards that aren't present - just to keep things clean. Deleting the entries for each video card and rebooting with only one video card accessible is what you'd get with a fresh install, except that it's much quicker if you know what you're doing - Never delete " HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E968-E325-11CE-BFC1-08002BE10318}," but one can delete keys for each video card starting with “0000″ and then “0001″, etc. to mimic what a fresh OS install does for the video card registry.

[smicha]

Tutor,
sure. But I will be able to access the computer on Monday morning so no rush my friend

[Tutor]

Tutor,
sure. But I will be able to access the computer on Monday morning so no rush my friend

See my last post.

[smicha]

So many thanks!!! I''ll test it on Monday and report immediately.

[Tutor]

So many thanks!!! I''ll test it on Monday and report immediately.

Latest thought: The property folder contents is inaccessible, so if it got scrambled then a clean install must be performed. But if the problem is with the registry folder for just one or more particular GPUs (which appears to be more likely given your description of the problem), then a clean install will not be necessary.

BTW - It's just a coincidence, but earlier this very week I had to delete all of the registry entries for my installed video cards because I moved from temporarily using a GTX Titan for display to what I've been customarily using for my display cards, namely, a GT 640 4G. This was done to run a test for Notiusweb. My system continued to boot with the Titan as the display card even after I had relegated it to a render only card by moving it from the main CPIe slot to my Amfeltec x4 Splitter and inserted the GT 640 into the main PCIe slot and rerunning the Nvidia driver installs. The only way that I could get the system to use the GT 640 was to wipe out the registry entries for all of the video cards even though one of them was for the GT 640 when it was last used for interactivity/display. One of my first Nvidia-next-release goals is to get Pascal equivalents for my seven GT 640s which I hope will soon follow the late May intro of the GTX 1080 and early June intro of the GTX 1070 [ http://videocardz.com/59604/nvidia-anno ... e-gtx-1080 ].

[itou31]

Hi, to help you clean install of GPU drivers, you can use DDU (Display Driver Uninstaller). and use RegmagiK to make a shortcut to registry for Graphics (as told by Tutor) and you can do copy/paste of keys.

[smicha]

Thanks itou, I'll try it soon.

[Notiusweb]

BTW - It's just a coincidence, but earlier this very week I had to delete all of the registry entries for my installed video cards because I moved from temporarily using a GTX Titan for display to what I've been customarily using for my display cards, namely, a GT 640 4G. This was done to run a test for Notiusweb.

Why did you switch it up...my test isn't good enough for a Titan?
My registry has about 60+ records from all the variant Titan Z 12 setups I've tried. I never thought to delete them. I worry if I did however, I'd F up my whole thing!

Maybe when the user plugged in the 7th GPU he disabled the above 4G decoding in the BIOS?
What's interesting about the whole ASUS board circumstance is that if you look at it from inside the inverted mirror, there may not be only a mode that limits the number of GPU, but one that potentially allows even more, 12-13, or dare I say 14?

[Tutor]

Thanks itou31 for the DDU & RegmagiK leads.