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Are there any important (e.g. performance) differences between AMD64 and i386 AMIs on AWS - assuming both have EBS-backed storage? Can also assume micro instances in a US availability zone.

Are the different AMIs hosted on the same physical hardware stack, or does AWS load different instance images on matching physical hardware (FYI, I realize that the point of platforms like AWS is not to think about these types of details, so maybe the answer is, "There is no functional difference").

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closed as not constructive by Michael Hampton, Ward, Tom O'Connor, Dave M, Scott Pack Apr 30 '13 at 17:40

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Even Amazon's oldest servers were 64-bit capable, right at launch years ago. The only thing that might have been 32-bit-only would be an Atom or something too old to be used in a new (then) project. So that's irrelevant. –  Michael Hampton Apr 30 '13 at 2:27
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There's really no reason I can think of to run an i386 EC2 instance. –  ceejayoz Apr 30 '13 at 2:33

1 Answer 1

Are there any important (e.g. performance) differences between AMD64 and i386 AMIs on AWS - assuming both have EBS-backed storage?

Other than one being 32-bit and one 64-bit? That's a pretty significant difference.

Are the different AMIs hosted on the same physical hardware stack, or does AWS load different instance images on matching physical hardware

No idea, you'll need to ask Amazon.

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