Is it all about the GPU ?
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Number crunching :
Is it all about the GPU ?
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Send message Joined: 19 Nov 07 Posts: 4 Credit: 227,796 RAC: 0  
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Hello, when running gpu models does it matter how powerful the cpu chip is ? i mean will you get the same results from the same card if you put one in an old single core amd CPU or an Intel i7 920 quad with multithreading ? Pete |
 apohawk Send message Joined: 13 Sep 08 Posts: 12 Credit: 131,420,119 RAC: 0  
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Check in BOINC Manager's preferences "Use GPU while computer is in use" and "Only after computer has been idle for ____ minutes". Status "waiting to run" indicates that the WU was started and stopped, most likely due to the settings above. |
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Send message Joined: 19 Nov 07 Posts: 4 Credit: 227,796 RAC: 0
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I just noticed that and was changing my question to a new one when you posted your answer thank you for the super fast and super correct answer could somebody answer the new question ? i promise not to change it lol Pete |
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apohawk Send message Joined: 13 Sep 08 Posts: 12 Credit: 131,420,119 RAC: 0
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It should be the same. CPU part is estimated to be barely 0.05 (initialization and feeding data to the GPU i guess), so just focus on GPU. |
GalaxyIce Send message Joined: 6 Apr 08 Posts: 2018 Credit: 100,142,856 RAC: 0
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I have GPU's that are all about the same which work the same in PCs with old/slow CPUs as well as even older/slower PCs. I can't comment on Intel i7 920 quad with multithreading since I don't have any, but I'm getting stacks of credits with my GPUs with the older cores that I have. |
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Paul D. Buck Send message Joined: 12 Apr 08 Posts: 621 Credit: 161,934,067 RAC: 0
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Hello, Pete, The issue here is you are asking an "it depends" type of question expecting a yes or no answer. If you are running just work on the GPU then probably not. Any CPU will do as well or as badly as any other. If you run multiple GPUs then a more powerful CPU may help only slightly if that is all your system is doing. If, however, the system is fully loaded running BOINC work on the CPU and the GPU(s) then, yes, a faster/better CPU will allow you to do more work... Real-life example was a little over a year or so ago GPU Grid's application took nearly a full core to support the GPU ... sort of like the application at Einstein does right now ... so, my i7 system supporting 4 GPUs used nearly one "core" to support all 4 GPU cores I had on that system... my Q9300 also lost almost a full core but only supported one GPU ... Bottom line? The i7 was far more efficient in handling the threads that supported the GPUs than a straight quad core... |
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