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What is the difference between 32-bit and 64-bit and which should I choose?

Well, I've recently bought an Alienware M17X and it has and Intel processor, which I've never had before. My last computer had an AMD processor,which ran only Ubuntu 64 Bit. I had installed Ubuntu 32 Bit first, but I had lots of problems, and one of them was the machine temperature, that gets lot hotter when running a 32 Bit version. My new processor is an Intel 7320QM and it runs Windows 7 64 Bit fine. But like my older machine used to run Windows Vista 32 Bit fine, but not Ubuntu 32 Bit. It doesn't make sense at all. So I need to know if one of you guys have ever experienced something like this befor? Which version should I get for my Intel processor, 32 or 64 Bit?

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marked as duplicate by Uri Herrera, fossfreedom Jun 10 '12 at 20:33

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.

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It really depends on how much RAM you have. If you have more then 4 GB of RAM, and if it's Alienware, I'm assuming you do, then you should definitely install Ubuntu 64 Bit to take advantage of all of that RAM.

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But it won't be raising the temrature will it? Can Intel processors handle 64 Bit systems? Because I downloaded the 64 Bit version and the name of the file already comes with "amd". –  user37504 Jun 10 '12 at 1:12
It doesn't depend on how much RAM you have and much less the Manufacturer of the Computer, you can perfectly use the 32 bit with over 4GB of RAM. @ThiG. Intel CPUs handle 64 system since.. like 15 years ago, now in regards of the 32 vs 64 bit pros and cons And the amd suffix in the ISO images there are already answered questions here, please make use of the search field up there. –  Uri Herrera Jun 10 '12 at 2:19
if it is duplicate, then point our mates to the duplicated one. be nice! –  B4NZ41 Nov 20 '13 at 4:12