20060325, 04:55  #1 
Mar 2006
11 Posts 
Graphic Card usable for Prime?
nvidia wants to use graphic cards to calculate the phsical part in PC games.
When does Prime95 follow this idea and use the GPU for the math? Is it possible? Regards 
20060325, 05:18  #2 
Jul 2004
Nowhere
809 Posts 
there are those physix cards being sold currently and they must have some wicked power because i saw things not even a 10000 dollar machine could do in a video game in gameplay.

20060325, 05:20  #3 
Sep 2002
662_{10} Posts 
This has been brought up before,
the issue is the precision/size of the numbers (data formats) available. The GPUs have 32 bit single precision floating point (earlier 16 bit integer) but 64 bit double precision is needed at least for the FFT routines used by the LucasLehmer algorithm with Prime95. If the smaller range of numbers available with 32 bit floats can be used by a math algorithm then the GPU could be used. If the algorithm is enhanced by the parallel processing of the GPU then it could have very good performance. The physics calculations done on the nVidia GPUs in SLI could also be done by the AGEIA PhysX Processor ( PPU ) that is starting to ship. 
20060325, 19:24  #4  
"Richard B. Woods"
Aug 2002
Wisconsin USA
2^{2}×3×641 Posts 
As I wrote in an earlier thread:
Quote:


20060327, 00:20  #5 
"William"
May 2003
New Haven
3·787 Posts 
Has anybody looked into Trial Factoring on a GPU? It seems like the data needs of that task are a better match for the hardware.

20060402, 22:27  #6 
Mar 2003
Melbourne
5·103 Posts 
Looks like the dedicated physics cards won't be suitable for LL work either.
According to: http://personal.inet.fi/atk/kjh2348fs/ageia_physx.html The PPUs from Ageia are "optimized for 32bit floatingpoint math" (and yeah the demos using the PPUs looks absolutely awesome)  Craig 
20060921, 05:23  #8 
Jun 2003
3^{2}×17 Posts 
64 bit Floating Point Math on ATI R580 graphics cards
I recently saw a reference to http://www.peakstreaminc.com which describes the performance increase that is possible using their software libraries and ATI R580 graphics cards. According to this web site they support 64 bit floating point math for high performance computing needs using C and/or C++. They are also offering a no cost evaluation program for Linux workstation users.

20061002, 16:12  #9 
Aug 2002
Rovereto (Italy)
3×53 Posts 
Something new under the sun?
http://ir.ati.com/phoenix.zhtml?c=10...519&highlight= Or are we always facing with double precision iussues? 
20061109, 11:38  #11  
Apr 2003
Berlin, Germany
19^{2} Posts 
What Nvidia means is actually the 4 component vector composed of 4 32bit floats. See as an example, how they handle the bit count:
Quote:


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