AMD64 vs i386/x86

Christopher Chan christopher.chan at
Thu Feb 18 02:02:32 UTC 2010

On Thursday, February 18, 2010 05:54 AM, J wrote:
> On Wed, Feb 17, 2010 at 16:44, Odd<iodine at>  wrote:
>> Some time ago, we were discussing which was faster. Some said the bigger
>> foot print of AMD64 instructions makes it slower than x86. This article is
>> interesting:
> Just to clear some confusion, that article is comparing stock 32bit,
> 32bit w/ PAE, and x86_64 kernels, it is NOT comparing the AMD64
> processor line to Intel's x86 processor line ;-)

There was a time when Intel's EMT64 cpus needed PAE which meant they 
were slower than AMD64 cpus for certain apps iirc.

> FWIW, both of these, IMHO do better than the IA64 from Intel... but my
> experience on IA64 systems is limited, thankfully.

Apparently AMD64/EMT64 cpus caught up to Itanium-2 processors in 
performance but that was just hearsay. But their support of 32-bit 
binaries is abysmal.

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