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Why not use 64-bit Ubuntu?

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When I tried to download Ubuntu, I have two options : 32bit and 64bit, and 32bit is recommended. Is there any reason for this?

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Some CPUs like the Intel Atom are 32 bit, and lots of older hardware don't have 64 bit drivers. –  Uri Herrera Jul 26 '11 at 16:00
    
also look here askubuntu.com/questions/1441/why-not-use-64-bit-ubuntu –  Uri Herrera Jul 26 '11 at 16:01
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Possible Duplicate: Why not use 64-bit Ubuntu? and /or Difference between 32bit and 64 bit? –  Achu Jul 26 '11 at 16:16
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marked as duplicate by Jorge Castro, fossfreedom, Lekensteyn, Marco Ceppi Jul 26 '11 at 21:04

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The 32-bit version of Ubuntu will run on most modern computers, but 64-bit has more specific requirements. There are a few things that won't run well with the 64-bit version (although these don't seem to be many), so the 32-bit version is recommended just to cover all the bases, I think. However, if you have a 64-bit computer, odds are that everything you need will run on it and will do so very well.

For example, I was able to get the Linksys AE1000 wireless access point to work just fine with my 32-bit Ubuntu, but when I changed to the 64-bit version I could no longer get the AE1000 to work. (Perhaps there's a fix but I was never able to find it.) However, that wasn't a big deal for me, and overall the 64-bit version feels a bit faster and it really runs everything else I've tried.

And although the 64-bit version is called AMD, it works as well on Intel 64-bit processors.

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Heck, I've tried the 64-bit version. It does have an edge in performance, but not that much. I'd stick with the 32-bit version for now. –  TreefrogInc Jul 26 '11 at 16:36
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