Message boards :
Number crunching :
Is SLI faster
Message board moderation
Author | Message |
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MarkS Send message Joined: 26 Apr 03 Posts: 18 Credit: 97,370,569 RAC: 97 |
Hi, I have two GTX560 cards and was wondering if it is better/faster to install the SLI link or leave them as two separate cards, they only have 1G of memory so it might be a problem running to many units at once Thanks MarkS |
Ex: "Socialist" Send message Joined: 12 Mar 12 Posts: 3433 Credit: 2,616,158 RAC: 2 |
Hopefully someone else will chime in here, but I do not believe SLI does much for crunching seti. #resist |
Khangollo Send message Joined: 1 Aug 00 Posts: 245 Credit: 36,410,524 RAC: 0 |
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kittyman Send message Joined: 9 Jul 00 Posts: 51468 Credit: 1,018,363,574 RAC: 1,004 |
With the newer drivers, and I do not know what version changed this, you do not HAVE to disable SLI to crunch Seti properly. However, I seem to have better results if I do manually disable SLI after installing the cards and driver. "Freedom is just Chaos, with better lighting." Alan Dean Foster |
MarkS Send message Joined: 26 Apr 03 Posts: 18 Credit: 97,370,569 RAC: 97 |
Thanks for that, I have disable SLI and am running 2 task per card, I'll leave it like that for a week or so and see what happens Thanks MarkS |
EPG Send message Joined: 3 Apr 99 Posts: 110 Credit: 10,416,543 RAC: 0 |
Originally, you had to disable SLI to use all the cards, but from 190.38: - Added support to make all GPUs within an SLI group available for CUDA applications to use.[/b] |
Yanivicious Send message Joined: 29 Mar 12 Posts: 157 Credit: 15,529,301 RAC: 0 |
what if your card is a GTX 590 or 690, since it is a dual GPU card, is there considered to be an SLI link in the card or is that different? |
Horacio Send message Joined: 14 Jan 00 Posts: 536 Credit: 75,967,266 RAC: 0 |
what if your card is a GTX 590 or 690, since it is a dual GPU card, is there considered to be an SLI link in the card or is that different? For crunching It dosnt matter if the physical SLI link is there or not, what makes a difference (depending on driver version) is when you have the SLI feature enabled (or not) in the Nvidia control panel. |
Fred J. Verster Send message Joined: 21 Apr 04 Posts: 3252 Credit: 31,903,643 RAC: 0 |
what if your card is a GTX 590 or 690, since it is a dual GPU card, is there considered to be an SLI link in the card or is that different? This is also true for CrossFire on AMD ATI GPUs (But doesn't the app. 'see' the Compute Capabillity and # of Compute Units, so it doesn't matter if CrossFire (ATI) or SLI(NVidia) is enabled)? |
Fred J. Verster Send message Joined: 21 Apr 04 Posts: 3252 Credit: 31,903,643 RAC: 0 |
what if your card is a GTX 590 or 690, since it is a dual GPU card, is there considered to be an SLI link in the card or is that different? Just before a GPU is picked: Termination request detected. GPU device synched, awaiting termination... Can this be the result of an Active Cross Fire state? Synched by SmartDoctor f.i.? |
Mike Send message Joined: 17 Feb 01 Posts: 34253 Credit: 79,922,639 RAC: 80 |
No has nothing to do with crossfire in particular. With each crime and every kindness we birth our future. |
Fred J. Verster Send message Joined: 21 Apr 04 Posts: 3252 Credit: 31,903,643 RAC: 0 |
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Brkovip Send message Joined: 18 May 99 Posts: 274 Credit: 144,414,367 RAC: 0 |
No, for crunching/CUDA, each card is used separately. You must leave SLI disabled - it is only for 3D. Crunching doesn't work in SLI. SLI does work in crunching but it uses the memory from one card not both. You also don't see any speed benefit. You would be better to disable it then leave it running if you are only doing Seti on it. |
-BeNt- Send message Joined: 17 Oct 99 Posts: 1234 Credit: 10,116,112 RAC: 0 |
I leave SLi enabled on my 670's and it uses both cards. With it disabled I saw no difference in speed or amount of units I could run. The difference is the memory is mirrored card to card(think raid). I run 6 work units just fine this way with 1564MB of memory being utilized both cards maxed at 97% utilization. On lower memory cards it may cause an issue however. Traveling through space at ~67,000mph! |
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