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Why does amd call a 64 bit cpu x86?

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a b à CPUs
March 22, 2012 2:36:19 AM

i commonly see x86 stuff advertised on 64 bit chips, why do they do that?

but x86 is still epic! you can build a cpu in minecraft but it was 4 bit, my friend blow up ther other 4 bits

More about : amd call bit cpu x86

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a b à CPUs
March 22, 2012 3:06:46 AM

X86 is the instruction set for the CPU. Early CPU's used 16 bit and it's moved upward since. It started out as 16 bit then moved to 32 bit and is now most commonly 64 bit instructions. Supposed to be backward compatible so you can run Win 7 on an original 8086 chip.
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a c 185 à CPUs
a b À AMD
March 22, 2012 3:10:50 AM

x86 is instruction set..
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a b à CPUs
March 22, 2012 3:11:38 AM

DelroyMonjo said:
X86 is the instruction set for the CPU. Early CPU's used 16 bit and it's moved upward since. It started out as 16 bit then moved to 32 bit and is now most commonly 64 bit instructions. Supposed to be backward compatible so you can run Win 7 on an original 8086 chip.

ok... why in the world would sombody run windows 7 with a 8086... wikipedia said it's 16 bit with 5MHz-10MHz wow bf3 must run good on 16 cash registers (lol)
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a c 185 à CPUs
a b À AMD
March 22, 2012 3:30:46 AM

Just because it can be run on W7 :) 
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a b à CPUs
March 22, 2012 1:26:16 PM

Because, AMD64 is simply an extension of the X86 instruction set.
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a c 148 à CPUs
a b À AMD
March 22, 2012 1:46:34 PM

*MORE:
Actually, I've noticed Microsoft and others differentiating 32-bit vs 64-bit this way:

32bit -> x86
64bit -> x64

In reality it should be:
32bit -> x86_32
64bit -> x86_64

What happened was that even though "x86" represents the Instruction Set for most desktop CPU's, 32-bit was around so much that x32 became interchangeable with x86.

However, when x64 (64bit) cropped up many people (including Microsoft) have messed it all up.
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a b à CPUs
March 22, 2012 4:51:20 PM

*points out the X86 ISA started as a 16-bit architecture*
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a b à CPUs
March 22, 2012 4:55:40 PM

Dont forget the Itanic IA 64 wich was 64 bit only and would not run on a x86_32bit os.
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a b à CPUs
March 30, 2012 5:31:47 AM

Best answer selected by melikepie.
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a b à CPUs
March 30, 2012 12:15:13 PM

DelroyMonjo said:
X86 is the instruction set for the CPU. Early CPU's used 16 bit and it's moved upward since. It started out as 16 bit then moved to 32 bit and is now most commonly 64 bit instructions. Supposed to be backward compatible so you can run Win 7 on an original 8086 chip.


An 8086 WILL NOT RUN Windows 7...it has no FPU !!
u'll have to couple it with a 8087 :p 

Secondly, 8086 is 16 bits, Win7 is only available in 32/64bit versions. :p 

Even if there was a 16bit version, i still doubt it would work, coz i think Win7 needs atleast the MMX and SSE1 instruction sets :D 
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a b à CPUs
March 31, 2012 10:37:45 AM

Well, $hawn, I did say 'supposed' to be compatible. But I'll give you props for adding useful information to the answer.
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