See for example this thread from last month:
http://forums.nvidia.com/lofiversion/index.php?t181562.html
More search in the forum should give you more answers, as I assume
this is a faq.

On Fri, Oct 29, 2010 at 8:11 PM, Julien Cornebise
<julien.corneb...@gmail.com> wrote:
>> "In the more expensive "Tesla" configurations, the chip features optional
>> ECC protection on the memory, and can perform one double-precision floating-
>> point operation per cycle per core; the consumer GeForce cards are
>> artificially driver restricted to one DP operation per four cycles. "
>>
>> So, if I want double-precision float performance, what are my choices?
>
> I never benchmarked Tesla vs GTX, however you're not looking into the
> same price range *at all* (think ten-fold increase).
> You may find more specific answers on the nvidia forums dedicated to
> CUDA, as this list is more targetted to the specific software toolbox
> pyCuda.
> http://forums.nvidia.com/
>
> Best,
>
> Julien Cornebise
>

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