I understand why functions like ElementData or CountryData need to download up-to-date data when first launched. However, when trying to use CUDA for the first time in Mathematica, I ran:

Needs["CUDALink"]; CUDAQ[]


which downloaded data for several minutes. Given that I have a quite fast net connection, that must amount to a really large amount of data. What does Mathematica download in that case? I guess drivers, but how can I check what it downloads?

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Oh, and it took almost 10 minutes to say: False`. Now I'm pissed off! – F'x Mar 25 '12 at 11:39
There are a few reasons why it would give False, if you evaluate CUDAInformation[] it might give you some hints and it will forward you to the CUDA setup page (reference.wolfram.com/mathematica/CUDALink/tutorial/Setup.html) – adk Mar 25 '12 at 16:54