Does SETI@HOME use double-precision?


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Sam Burchmann

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Message 1684586 - Posted: 27 May 2015, 1:14:51 UTC

Hi Team,

I am looking into buying another GPU and i am wanting to know if SETI@HOME actually uses double-precision or single-precision for their WUs.

The reason i ask is because if SETI@HOME actually uses double-precision then i can purchase another Quadro 4000 for $150 that can do more ouble-precision calculations then a GTX 770 that would cost me around $350

Looking forward to hearing from you all, this is also my very thread in 5 years of crunching for SETI :)
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Profile Brent Norman Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
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Message 1684592 - Posted: 27 May 2015, 1:28:02 UTC - in response to Message 1684586.  

I'm relatively sure that SETI does single precision, but there was talk of changing apps, so does that mean double precision?
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Message 1684593 - Posted: 27 May 2015, 1:36:15 UTC - in response to Message 1684592.  

It is single precision. There are other projects that use the double.

I don't believe the discussion about changing apps has anything to do with single vs double precision.
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Sam Burchmann

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Message 1684596 - Posted: 27 May 2015, 1:48:20 UTC

Thanks heaps guys!

Now to find a second hand card that uses a 6pin power connector and does over 1k of Gflops of single :)

Ill keep you updated
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Message 1684613 - Posted: 27 May 2015, 2:35:39 UTC - in response to Message 1684596.  

Thanks heaps guys!

Now to find a second hand card that uses a 6pin power connector and does over 1k of Gflops of single :)

Ill keep you updated

A GTX 960 is rated for 2300 GFLOPS, or 2.3 TFLOPS if you rather, & is listed at 120w. It looks like many of those that do not have a huge factory overclock come with a single 6-pin power connector.
Then again there are the GTX 750 Ti cards. Which at a factory 60w does not need a PCIe power connector & it is rated at 1.3 TFLOPS
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Profile Sutaru Tsureku
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Message 1684618 - Posted: 27 May 2015, 2:44:50 UTC - in response to Message 1684596.  
Last modified: 27 May 2015, 2:47:10 UTC

I would use just same VGA cards in one PC.
If not, you would screw up the Credit granting calculation (system 'CreditNew').

E.g. you have a slow and a fast VGA card.
The 'CreditNew' take into account the calculation times of the tasks.
I don't know how it will be then, but it will be surprising.

Maybe, the fast VGA card get little Credits granted, because (fast) short calculation times - and the slow VGA card get more Credits granted, because (slow) longer calculation times of the tasks.

(stock - same app usage, or 'anonymous platform' (app_info.xml file usage))
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Message boards : Number crunching : Does SETI@HOME use double-precision?


 
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