a little update how device numbering in boinc is.
boinc sees multi-gpu setup the same way as gpu-z sees.

under ADVANCED tab you have option called CUDA, under CUDA you can see MULTI BOARD and then No (0) or No (1) etc etc. those device numbers in gpu-z are the same device numbers in boinc. and THIS numbering is done according to PCIE BUS ID. lower PCIE ID gets lower device number. you should say: of course, nothing strange or news with this.

now comes strange part....my motherboard asrock x399 taichi (for threadripper cpu's) has the following pcie-slots, counting from the pcie-slot most nearby cpu and memory banks:

- x16 electrial (pcie bus id 66)
- x16 slot (eletrical x8, pcie bus id 66)
- x1 slot electrical (pcie bus id 7)
- x16 electrical (pcie bus id 10)
- x16 slot (electrical x8, pcie bus id 9)

according to this pcie bus id's my device 0 in boinc and in gpu-z is x1-slot.

all this information is just for sharing.
i am not asking why 1st pcie-slot (most nearby cpu and memory banks) has the highest pcie bus id. but just sharing my experience.

oh yeah, forgotten to say.....swan_sync enabled under windows 10, tried with different gtx-cards (1060 and 1070), alsways multi-gpu in alls the same gtx-cards or all mixed gtx-cards.

so, i am saying: the card type has nothing to do with pcie bus id numbering

have fun !!!

another question....rigth now i am testing gtx 1080 Ti card. its load is about 50%. this card is connected to pcie-x8 slot. is this normal for 1080 Ti? 50% load of gpu?

if it is not, is it possible to sign specific app (acemdlong or acemdshort) to this specific card? and then using gpu_usage 0.5 comment to load 2 WU on this card so it finally get almost 100% gpu load?

another question....rigth now i am testing gtx 1080 Ti card. its load is about 50%. this card is connected to pcie-x8 slot. is this normal for 1080 Ti? 50% load of gpu?

Did you enable SwanSync ?

another question....rigth now i am testing gtx 1080 Ti card. its load is about 50%. this card is connected to pcie-x8 slot. is this normal for 1080 Ti? 50% load of gpu?

Did you enable SwanSync ?

yes, swan_syn is enabled. i am running windows 10, 64bit with latest windows updates, nvidia driver version 430. gpu load for gtx 1080 Ti is round 55-59%, connected to pcie-x8 slot (and also electrically x8-slot)

so once again my question....is it possible to asign a specific gpu-card to a specific application? meaning...i would like to asign gtx1080 Ti to only acemdlong-app. is this possible?

meaning...i would like to asign gtx1080 Ti to only acemdlong-app. is this possible?

No, but you can exclude a GPU from a project.
See the <exclude_gpu> section here.

meaning...i would like to asign gtx1080 Ti to only acemdlong-app. is this possible?

No, but you can exclude a GPU from a project.
See the <exclude_gpu> section here.

thanks for your reply. pitty i cann't asign specific device to specific application with specific setting for that device or appliction....would be great feature of BOINC

meaning...i would like to asign gtx1080 Ti to only acemdlong-app. is this possible?

No, but you can exclude a GPU from a project.
See the <exclude_gpu> section here.

thanks for your reply. pitty i cann't asign specific device to specific application with specific setting for that device or appliction....would be great feature of BOINC

That is low GPU util even w/o swan sync.

The best way to use 1 GPU on one project and a 2nd GPU on another project is with separate BOINC Clients with the exclude function mentioned above. I have a guide for Windows and Linux at Overclock.net in the BOINC Guide sub forum if you're interested. My PCs with GPUs all have 1 client for CPU work and another for GPUs. It allows for finer control of work buffers, esp during competitions.

meaning...i would like to asign gtx1080 Ti to only acemdlong-app. is this possible?

No, but you can exclude a GPU from a project.
See the <exclude_gpu> section here.

thanks for your reply. pitty i cann't asign specific device to specific application with specific setting for that device or appliction....would be great feature of BOINC

That is low GPU util even w/o swan sync.

The best way to use 1 GPU on one project and a 2nd GPU on another project is with separate BOINC Clients with the exclude function mentioned above. I have a guide for Windows and Linux at Overclock.net in the BOINC Guide sub forum if you're interested. My PCs with GPUs all have 1 client for CPU work and another for GPUs. It allows for finer control of work buffers, esp during competitions.

so, i have read your guide for 2nd client setup.

what you actually suggest is in 1 client to exclude gtx1070 and include gtx1080 with setting like i wish.

in another client (2nd client) to do the opposite...do i understand you correct?

because you make 2 folders for boinc:
C:\ProgramData\BOINC

C:\ProgramData\BOINC2

meaning...i would like to asign gtx1080 Ti to only acemdlong-app. is this possible?

No, but you can exclude a GPU from a project.
See the <exclude_gpu> section here.

thanks for your reply. pitty i cann't asign specific device to specific application with specific setting for that device or appliction....would be great feature of BOINC

That is low GPU util even w/o swan sync.

The best way to use 1 GPU on one project and a 2nd GPU on another project is with separate BOINC Clients with the exclude function mentioned above. I have a guide for Windows and Linux at Overclock.net in the BOINC Guide sub forum if you're interested. My PCs with GPUs all have 1 client for CPU work and another for GPUs. It allows for finer control of work buffers, esp during competitions.

so, i have read your guide for 2nd client setup.

what you actually suggest is in 1 client to exclude gtx1070 and include gtx1080 with setting like i wish.

in another client (2nd client) to do the opposite...do i understand you correct?

because you make 2 folders for boinc:
C:\ProgramData\BOINC

C:\ProgramData\BOINC2

Yes, thats correct. One install, several client instances are opened with separate data directories (with their own configs).