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I having using Ubuntu for about 6 years now. I have seen some of its bests and some of its worsts.

I have tried Ubuntu 64 bits and have many issues, among them the computer ran a lot slower than with 32 bits.

I want to buy a >8GB RAM computer and I'm considering which version of Ubuntu to use.

I have heard something about Ubuntu 32 bits with PAE, or Ubuntu 64 bits.

Which version has less issues/ will work?

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I would use Ubuntu 12.04 64-bit. They have really worked out most (all?) of the 32 vs 64 bit issues in the last few releases. I have been running 11.04 and 12.04 64-bit on several of our machines at work, and have not had any architectural related issues so far.

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I haven't noticed any problems I can associate with 64 bit either. Very happy. – Joshua Siret Jul 23 '12 at 16:33
Indeed, while the PAE version will let you access all your RAM, each program will still be limited to using a very small fraction of it. (PAE doesn't provide Virtual Address Extension.) On a 64-bit system, there is no such limitation, and multarch makes even 32-bit applications work easily on 64-bit Ubuntu. – Eliah Kagan Jul 23 '12 at 16:42

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