Why doesn't S@H use my CUDA possible GPU?

Questions and Answers : GPU applications : Why doesn't S@H use my CUDA possible GPU?
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Profile Bobaab

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Message 843511 - Posted: 22 Dec 2008, 7:24:26 UTC
Last modified: 22 Dec 2008, 7:26:11 UTC

First of all, I am on a laptop that has an AMD cpu and a GeForce 8400M G gpu. This gpu is under the list of compatible gpu's that have CUDA and it has 256mb of video ram.

I updated the video card driver from the Nvidia website and am running Boinc 6.4.5. CUDA is seen in Boinc upon startup.

What's the problem? Although I don't think using CUDA will be faster, I still want to see for myself. Any help is appreciated!
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George
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Message 843512 - Posted: 22 Dec 2008, 7:27:23 UTC

dose it use shared ram set in the bios?
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Message 843520 - Posted: 22 Dec 2008, 7:43:36 UTC - in response to Message 843512.  

I'll have to check that, but from my understanding, this is not an integrated GPU.
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Message 843531 - Posted: 22 Dec 2008, 8:14:20 UTC
Last modified: 22 Dec 2008, 8:16:10 UTC

i looked up you gpu specs be sure to do this http://setiathome.berkeley.edu/forum_thread.php?id=50829
because it a slow gpu needed to say it one more time its slow
and looking at you computer info i see this
Coprocessors [CUDA|GeForce 8400M G|1|127MB]
need at lest 256mb ram to work
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Message 843551 - Posted: 22 Dec 2008, 9:41:34 UTC - in response to Message 843531.  

Thanks. I was under the impression that it had 256mb...guess not! Thanks for finding that :)
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Profile Byron S Goodgame
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Message 843560 - Posted: 22 Dec 2008, 10:03:10 UTC

From what I'm seeing here it looks like it should have a max capability of 256. If it does, you'll have to change it in the bios if possible.

Even if it is, it's still going to be a slow gpu and in the end you may decide it's not worth the time.
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Profile Jord
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Message 843563 - Posted: 22 Dec 2008, 10:11:24 UTC - in response to Message 843551.  

Do know that the Seti CUDA application uses at minimum 200MB of Video RAM per task. That's why the minimum of 256Mb is put in place.

When you do want to use it, make absolutely sure that while you use the laptop, not much else will be using the videochip's RAM. Anything 3D is out. 2D usually uses between 2 and 10MB. If you want to play a game, do CAD/CAM or look something up in Google Earth, make sure to exit BOINC first.
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Message 845040 - Posted: 25 Dec 2008, 18:06:25 UTC

I checked the spec of my PC through several sources, including the manufacturer, and it turns out it only has 128mb. The card itself can have UP TO 256mb, that's why the Nvidia site says 256mb.

Thanks for everyone's help!
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Questions and Answers : GPU applications : Why doesn't S@H use my CUDA possible GPU?


 
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