Top posting this because the OP sent lshw info to me in a file offlist. 

tl;dr
Abstracting a system integration problem requires a Markovian analysis of 
state. You fetter that feature when you reboot the system.

To the OP: Required action if you want to use CUDA and OpenCL ILP features as 
you indicated by email offlist: 

Update bios. Revert to Stretch. Reinstall Nvidia's drivers.

Now for the small talk.

I mostly use a small swipe device for social email contacts and I don't notice 
when someone has dropped the list from the topic of an email communication, 
unless they change the subject by adding [OFFLIST].

I want to relate story from pre y2k days. I was volunteering at the Tlug booth 
at a compufest I also took charge of the BoF meeting at that one. While I was 
there I saw that John "Maddog" Hall was sponsored by Sun to give a talk which 
ended just before the BoF. 

I missed the talk, but went I went up to him and said I was with Tlug and since 
he was one of the gurus of linux could he just come and say a few words to some 
of the boys. 

A few things happened at that point. John looked at me in surprise, said I'm 
not a guru but sure lets go. After that, the Sun handler pipes up and starts 
talking about time and schedule and so on. John said nope, I have to do this.

John sat through the the entire BoF, fielding questions from everyone. After 
that we did the pub thing. Thereafter Sun's schedule for John may or may not 
have been maintained. NIce guy. We chatted a bit about the future of RF 
internet frames for rural access on his farm.

The point is John didn't have to do it at all. What he did and what impressed 
me about the man was, he took the time to validate the participatory nature of 
the community.  I also heard a rumor that Suns schedule was borked, but I can't 
say for sure.

lshw showed:

product: P9X79 DELUXE
date: 12/22/2011
configuration: filesystem=ext2 
lastmountpoint=/media/devuan/325c280b-4a4b-420e-8ac4-82aec9db48ec 
modified=2017-07-12 17:13:45 mounted=2017-07-12 17:08:36 name=/boot state=clean

Three things are immediately apparent. The bios is first iteration and over the 
next 3 years there are 20 updates, mostly dealing with stability issues. I 
include the versions and the dates because if the OP does find the time to deal 
with this I would prefer that information stay in the commons after I did the 
necessary reading to be able to help.

The third thing is devuan is not buster, as far as I know.

Here are the bios versions, note the stability and compatability issues. Also 
the method of converting the bios to UEFI compatibility.

Beta Version 4801
Description     P9X79 DELUXE BIOS 4801
Enables 128GB(8*16GB) support by IM ( Intelligent Memory ) memory modules
File Size       4.78 MBytes update  2014/07/28
Download from   Global
Version 4701

Description     P9X79 DELUXE BIOS 4701
Improve system stability.
File Size       4.78 MBytes update  2014/06/23
Download from   Global
Version 4608

Description     P9X79 DELUXE BIOS 4608
Improve system stability.
File Size       4.78 MBytes update  2014/02/18
Download from   Global
Version 4603

Description     P9X79 DELUXE BIOS 4603
Improve system stability.
File Size       4.78 MBytes update  2013/12/06
Download from   Global
Version 4502

Description     P9X79 DELUXE BIOS 4502
1 Enhance compatibility with some USB device.
2.Revise help string in BIOS.
File Size       4.78 MBytes update  2013/10/31
Download from   Global
Version 4404

Description     P9X79 DELUXE BIOS 4404
1 Enhance compatibility with some USB device.

2.Revise help string in BIOS.
File Size       4.67 MBytes update  2013/10/25
Download from   Global
Version 4302

Description     P9X79 DELUXE BIOS 4302
1.Fixed Power On By RTC function failed.
2.Improve system compatibility.
3.Support Intel IVB-E series CPU.
File Size       4.66 MBytes update  2013/09/02
Download from   Global
Version 4104

Description     P9X79 DELUXE BIOS 4104
1.Enhance compatibilty with some CPUs.
2.Support new CPUs. Please refer to our website at: 
http://support.asus.com/cpusupport/cpusupport.aspx?SLanguage=en-us
File Size       4.37 MBytes update  2013/07/08
Download from   Global
Version 4005

Description     P9X79 DELUXE BIOS 4005
1.Improve system compatibility.
2.Support new CPUs. Please refer to our website at: 
http://support.asus.com/cpusupport/cpusupport.aspx?SLanguage=en-us
File Size       4.34 MBytes update  2013/05/09
Download from   Global
Version 3501

Description     P9X79 DELUXE BIOS 3501
Enhance compatibility with some USB devices.
File Size       4.25 MBytes update  2013/03/21
Download from   Global
Version 3408

Description     P9X79 DELUXE BIOS 3408
Fixed that system will hang(blue screen) when installing UEFI OS
File Size       4.25 MBytes update  2013/03/20
Download from   Global
Version 3305

Description     P9X79 DELUXE BIOS 3305
Improve system stability.
File Size       4.25 MBytes update  2013/01/10
Download from   Global
Version 3203

Description     P9X79 DELUXE BIOS 3203
Improve system stability.
File Size       4.37 MBytes update  2012/12/07
Download from   Global
Version 3009

Description     P9X79 DELUXE BIOS 3009
Improve system stability.
File Size       4.14 MBytes update  2012/10/16
Download from   Global
Version 2104

Description     P9X79 DELUXE BIOS 2104
1.Improve compatibility with Windows 8 OS.
2.Improve system stability.
3.Enhance compatibility with some USB devices.
4. Fixed Nvidia GTX 680 hang when runing with UEFI driver.

*If your BIOS version is 1203 or older, please install the BIOS Converter first 
before you update the BIOS. The BIOS Converter is available in the BIOS 
Utilities.
File Size       3.65 MBytes update  2012/08/14
Download from   Global
Version 2002

Description     P9X79 DELUXE BIOS 2002
1. Improve system stability.
2. BIOS structure changed from .ROM to .CAP for Windows 8 full-functionality.

*If your BIOS version is 1203 or older, please install the BIOS Converter and 
then the converter will update BIOS to 2002.CAP. The BIOS Converter is 
available in the BIOS Utilities.
File Size       3.7 MBytes update  2012/07/30
Download from   Global
Version 1203

Description     P9X79 DELUXE BIOS 1203
1.Improve Improve system stability.
2.Improve memory compatibility.
File Size       3.17 MBytes update  2012/06/13
Download from   Global
Version 1103

Description     P9X79 DELUXE BIOS 1103
1.Improve Improve system stability.
2.Enhance compatibility with some USB devices.
File Size       3.17 MBytes update  2012/04/18
Download from   Global
Version 1009

Description     P9X79 DELUXE BIOS 1009
1. Improve system stability.
2.Improve memory compatibility.
3..Enhance compatibility with some USB devices.
4.Fix PCIEx16 VGA card HD 7970 cannot be detected when the temperature of VGA 
less than -40.
File Size       3.19 MBytes update  2012/04/06
Download from   Global
Version 0906

Description     P9X79 Deluxe 0906 BIOS
1. Enhance PCIe 3.0 Support Capability.
2. Enhance DRAM Compatibility.
3. Enhance CPU OC capability.
4. Enable VT-d support for VT-d enabled processor.
5. Speed up S3 resume time
File Size       3.19 MBytes update  2011/12/23
Download from   Global
Version 0802

Description     P9X79 Deluxe BIOS 0802
1. Enable UEFI driver support for added on cards.
2. BIOS will show "All Core" before "Target Frequency" if Turbo Boost is 
working under All Core mode.
File Size       3.15 MBytes update  2011/11/17
Download from   Global
Version 0709

Description     P9X79 DELUXE 0709 BIOS
First release Bios
File Size       3.15 MBytes update  2011/11/11
Download from   Global


On 7/24/17, Russell <[email protected]> wrote:
> On July 18, 2017 10:59:57 PM EDT, o1bigtenor via talk <[email protected]>
> wrote:
>>*working with xrandr 1.5 not finding how to connect second or third
>>gpu*
>>------------------------------
>>Greetings
>>
>>Running debian buster (testing) using lxqt. Have 3 nvidia 570 gpus 
<snip old>
-- 
Russell
Sent by K-9 Mail
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