2 GPUs in same PC - SLI or 2-way SLI ?

Message boards : Graphics cards (GPUs) : 2 GPUs in same PC - SLI or 2-way SLI ?

Author	Message
Erich56 Send message Joined: 1 Jan 15 Posts: 1132 Credit: 10,205,482,676 RAC: 29,855,510 Level Scientific publications	Message 42504 - Posted: 29 Dec 2015 \| 11:19:07 UTC
	I am planning to get a PC with 2 GPUs inside; so far I have never had any multi-GPU configurations, and hence no experience with this. What I gather so far is that there are mainboards with SLI and 2-way SLI. Whatever the difference is. Basically, my question is: does GPUGRID crunching work on multi-GPU-systems, so that the power and capabilities of both graphic cards can be used for GPUGRID? Does SLI / 2-way SLI have any Impact for GPUGRID?
	ID: 42504 \| Rating: 0 \| rate: / Reply Quote

mikey Send message Joined: 2 Jan 09 Posts: 297 Credit: 6,135,781,625 RAC: 30,282,829 Level Scientific publications	Message 42505 - Posted: 29 Dec 2015 \| 12:09:02 UTC - in response to Message 42504.
	I am planning to get a PC with 2 GPUs inside; so far I have never had any multi-GPU configurations, and hence no experience with this. What I gather so far is that there are mainboards with SLI and 2-way SLI. Whatever the difference is. Basically, my question is: does GPUGRID crunching work on multi-GPU-systems, so that the power and capabilities of both graphic cards can be used for GPUGRID? Does SLI / 2-way SLI have any Impact for GPUGRID? No SLI nor 2 way SLI does not help at any Boinc project, it does help alot if you are a gamer though. Boinc is not currently designed to share gpu's the way games can. There are some projects that can share cpu cores, so maybe in the future gpu's could be tried, but it would have to make ALOT of difference in the crunching to the project, not just faster speed for us users.
	ID: 42505 \| Rating: 0 \| rate: / Reply Quote

Erich56 Send message Joined: 1 Jan 15 Posts: 1132 Credit: 10,205,482,676 RAC: 29,855,510 Level Scientific publications	Message 42506 - Posted: 29 Dec 2015 \| 15:41:58 UTC - in response to Message 42505.
	No SLI nor 2 way SLI does not help at any Boinc project, it does help alot if you are a gamer though. Boinc is not currently designed to share gpu's the way games can. There are some projects that can share cpu cores, so maybe in the future gpu's could be tried, but it would have to make ALOT of difference in the crunching to the project, not just faster speed for us users. thanks a lot for your quick reply. Do I understand correctly though that if I buy a PC with one graphic Card, and than I simply put in another one on any other free PCIe slot, both graphic cards would then do their own work? So it would make sense to have more than one card for GPUGRID crunching?
	ID: 42506 \| Rating: 0 \| rate: / Reply Quote

Retvari Zoltan Send message Joined: 20 Jan 09 Posts: 2343 Credit: 16,206,655,749 RAC: 261,147 Level Scientific publications	Message 42507 - Posted: 29 Dec 2015 \| 17:43:40 UTC - in response to Message 42506. Last modified: 29 Dec 2015 \| 17:47:48 UTC
	Do I understand correctly though that if I buy a PC with one graphic Card, and than I simply put in another one on any other free PCIe slot, both graphic cards would then do their own work? Yes. So it would make sense to have more than one card for GPUGRID crunching? Yes. If you have two different GPUs, BOINC will use the faster one by default, and you have to configure the BOINC manager through the <use_all_gpus> setting in the cc_config.xml file. When you plan to use multiple GPUs in the same system, you should consider also the cooling of the cards, as the lower one will heat up the upper one(s), especially those cards which have custom cooling with axial fans.
	ID: 42507 \| Rating: 0 \| rate: / Reply Quote

Message boards : Graphics cards (GPUs) : 2 GPUs in same PC - SLI or 2-way SLI ?

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