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so I'm sure my PC is 64 bit, but while downloading ubuntu gnome, I encountered this:

PC (Intel x86) desktop image For almost all PCs. This includes most machines with Intel/AMD/etc type processors and almost all computers that run Microsoft Windows, as well as newer Apple Macintosh systems based on Intel processors. Choose this if you are at all unsure. 64-bit PC (AMD64) desktop image Choose this to take full advantage of computers based on the AMD64 or EM64T architecture (e.g., Athlon64, Opteron, EM64T Xeon, Core 2). If you have a non-64-bit processor made by AMD, or if you need full support for 32-bit code, use the Intel x86 images instead.

so yeah, it says that 64 bit is for AMD, so with my i7, should I pick 32 bit then?

Greets, and thanks for the answer!

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marked as duplicate by Uri Herrera, aquaherd, Basharat Sialvi, qbi, bcbc May 21 '13 at 19:14

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

You are rightfully confused. The releases page is completely NOT user friendly by mentioning obscure CPUs like the EM64T (ever seen one), when whoever buys EM64Ts knows far better what they're doing than someone who gets a run of the mill Core i3/5/7. Not that the "64" in "E64T" wouldn't be a dead giveaway anyway. Horrible example to choose, and just another instance of Linux being created by enthusiasts for fellow hackers, disregarding the regular user unfamiliar with the esoteric terminology. – Dan Dascalescu Mar 30 '15 at 11:48
up vote 2 down vote accepted

The "amd" is for all 64 bit processors, intel and amd, and the i7 is a 64-bit processor, so go with the amd (64 bit) iso.

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I'm running 12.04 64 bit on my i5 and it runs like a dream

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Nearly all modern Intel CPUs support AMDs 64bit extensions for x86 (if I'm not mistaken, Intel is licensing the technology from AMD). If your CPU does support it (all Core i processors do), I strongly recommend to use the 64bit version of Ubuntu, because it uses some CPU command set extensions, that are disabled on 32bit for compatibility with older CPUs. It is expected that the 64bit version has better performance in many applications, yet the memory requirements are slightly higher. Since Ubuntu is a multilib system, one can install (nearly) all 32bit programs on the 64bit system. 32bit libraries are installed when needed or manually, yet keeping two copies of many libraries uses some disk space.

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The Intel x86 architecture works for all processors. The AMD64 architecture is only compatible with 64-bit capable processors, and takes full advantage of your processor's capabilities. Unless you have a problem with program compatibility between the two architectures, you should probably use the AMD64, or 64-bit, architecture.

Useful links:

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