GPU number when having multiple GPU's

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TRuEQ & TuVaLu
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Message 48615 - Posted: 13 Apr 2013, 6:41:17 UTC

I've noticed BM and SIV says GPU 0 for my 5850 and that is located in my slower PCIE slot, X4 slot.

My 5970(2GPU's) are located in fast PCIE slot X16

SIV counts the first GPU as (1)
BM counts the first as (2)

I can tell when only running 1 task the 5970(2GPU's).

Then I wonder which program gives the correct device number.
SIV or BM??
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TRuEQ & TuVaLu
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Message 48616 - Posted: 13 Apr 2013, 6:44:44 UTC

My logic says.

PCIE X16 are primary and GPU should start with 0 or 0 and 1(if having a dual gpu attached to it).

The slower(secondary) card should be numbered with 1 or 2 when having single gpu card attached to it.

I dunno if this has any impact on the different program languages used to create apps though....
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TRuEQ & TuVaLu
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Message 48617 - Posted: 13 Apr 2013, 6:45:52 UTC

(note)
It may be the driver that assigns the number and then it is a AMD/ATI issue....
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TRuEQ & TuVaLu
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Message 48618 - Posted: 13 Apr 2013, 6:50:49 UTC

Catalyst is numbering PCIE X4 5850 card as 0
And Catalsyst also numbers GPU 2 as the number the task is running on.
So I guess BM assigns the correct number.

I'll try get a note to SIV people about this.


I've connected my monitor to both cards but I am using the slower PCIE X4 slot as primary screen adapter.

Maybe that's why it says GPU(0)

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Message boards : BOINC client : GPU number when having multiple GPU's

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