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KWH*
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Message 45997 - Posted: 5 Feb 2011, 20:57:49 UTC

I have seen the opposite. I have 3 GPU's in one box and 2 GPU's in 2 other boxes. I have seen NO gains in either SLI or CF. I have actually seen the opposite as it seems to take more overhead for the SLI/CF bridge. I can actually allot some CPU cores to CPU projects without penalty. Many have also experienced driver issues with some WU's in some projects. You can run however you want but SLI/CF isn't a magic tool for increased credit because FPS is meaningless in Boinc.
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Brickhead
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Message 46003 - Posted: 6 Feb 2011, 1:56:37 UTC - in response to Message 45997.  
Last modified: 6 Feb 2011, 2:06:36 UTC

I have seen the opposite. I have 3 GPU's in one box and 2 GPU's in 2 other boxes. I have seen NO gains in either SLI or CF. I have actually seen the opposite as it seems to take more overhead for the SLI/CF bridge. I can actually allot some CPU cores to CPU projects without penalty. Many have also experienced driver issues with some WU's in some projects. You can run however you want but SLI/CF isn't a magic tool for increased credit because FPS is meaningless in Boinc.

If you haven't connected a monitor or a "dummy plug" to each GPU, then Crossfire is the only way to enable all the GPUs (edit: on ATI/AMD cards). Other than that, BOINC couldn't care less about CF. But it can only use enabled GPUs, so CF is the way to go for many of us.

Here's an example that does use CF:
http://milkyway.cs.rpi.edu/milkyway/show_host_detail.php?hostid=215206
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KWH*
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Message 46004 - Posted: 6 Feb 2011, 2:03:04 UTC - in response to Message 46003.  

It does use CF/SLI but there is no benefit from it. This was never the topic only if it benefits from it. SLI/CF by nature use a lot of overhead from the GPU's and CPU. This is a reason why it does not scale 100% among other factors. Even if it used only a few percentage of each GPU, that's less time spend crunching a WU. I even disabled SLI on the 295 and saw small gains. Simple logic really.
Dummy plugs are cheap and easy to make. In XP, I don't even need them, only with Vista and Win 7.
If you want to run SLI/CF because it sounds cool, by all means do. Anything crunching helps.
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Message 46005 - Posted: 6 Feb 2011, 2:31:51 UTC - in response to Message 46004.  

...because it sounds cool...

Admittedly, I failed to guess which reference you were comparing CF/SLI to. But I don't think that really warrants the insinuation that any decision to team GPUs is based solely on perceived 'coolness'.
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KWH*
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Message 46006 - Posted: 6 Feb 2011, 2:32:48 UTC - in response to Message 46005.  

...because it sounds cool...

Admittedly, I failed to guess which reference you were comparing CF/SLI to. But I don't think that really warrants the insinuation that any decision to team GPUs is based solely on perceived 'coolness'.





You may be surprised.
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Message 46007 - Posted: 6 Feb 2011, 3:15:09 UTC

Is sli/crossfire a detriment to crunching?
NO negliable
Is it a much more elegant solution for enabling GPU's than "dummy plugs"
YES
Has using our crossfire bridges kept Brickhead and I from amassing over a billion credits?
NOPE
Nuff said
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KWH*
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Message 46008 - Posted: 6 Feb 2011, 3:22:19 UTC - in response to Message 46007.  

Is sli/crossfire a detriment to crunching?
NO negliable
Is it a much more elegant solution for enabling GPU's than "dummy plugs"
YES
Has using our crossfire bridges kept Brickhead and I from amassing over a billion credits?
NOPE
Nuff said



Just because you have 595959595959595959595.9 credits doesn't mean you know everything. And your " Nuff said" kinda says other things.
Negligible? That can be proven one way or the other. From my experience, it takes away from the credit in the long run. Elegant doesn't make a credit either.
Nuff said because you said so. No?
Congrats on your billions though, obviously that elevates you to GOD status.
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Message 46009 - Posted: 6 Feb 2011, 3:36:07 UTC

Wow, you take this stuff seriously don't you?
Or yourself at least.
Lighten up, it's just a hobby.
LMAO
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KWH*
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Message 46010 - Posted: 6 Feb 2011, 3:40:01 UTC - in response to Message 46009.  

Wow, you take this stuff seriously don't you?
Or yourself at least.
Lighten up, it's just a hobby.
LMAO



I'm not the one with the "billions and nuff said", and you took the time to post. Maybe take your own advice and I may follow suit.
Seriously?
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ProfileThe Gas Giant
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Message 46013 - Posted: 6 Feb 2011, 6:27:57 UTC

Seriously... :)
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ProfileBeyond
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Message 46014 - Posted: 6 Feb 2011, 14:22:52 UTC - in response to Message 46005.  

...because it sounds cool...

I don't think that really warrants the insinuation that any decision to team GPUs is based solely on perceived 'coolness'.

I like cool GPUs, the cooler the better
No sense getting all hot over a simple disagreement
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HassanShebli

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Message 46015 - Posted: 6 Feb 2011, 14:53:06 UTC

Guys:

Cool down . It is not a big issue.

I am going to open a new thread to ask everybody if crossfire or Sli means more crunching

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Cannibal Corpse
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Message 46290 - Posted: 19 Feb 2011, 2:07:11 UTC - in response to Message 46015.  

Well I say an HD5870, cheap, about $220 and a good all around card from the amd/ati brand. 1600 shaders up to 3000 mem, stock 850 core, 900 tops and a good stable temp. ihmo
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Message boards : Number crunching : Rate the following GPUs please

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