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128Bit Processor! - Page 2

post #11 of 43
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An other question:Will the processors be 64bit for ever?
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post #12 of 43
Quote:
Originally Posted by MD12 View Post
So now I am getting clue! What about quantum computers will they come to use!
Quantum computers don't even exist yet.

And it's not a matter of what will use it. It's the fact that no current or near future devices need more than 1TB or more of RAM which is what 64bit can address.
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post #13 of 43
Quote:
Originally Posted by MD12 View Post
An other question:Will the processors be 64bit for ever?
There is really no point to go above 64bit. 32bit cpus wont be functional after 2038 as the unix timestamp will reach the maximum possible value for 32bit integers.
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post #14 of 43
If anyone want's proof that the Cell BE is 64bit;

Quote:
The first-generation Cell Broadband Engine (BE) processor is a multi-core chip comprised of a 64-bit Power Architecture processor core and eight synergistic processor cores, capable of massive floating point processing, optimized for compute-intensive workloads and broadband rich media applications.
https://www-01.ibm.com/chips/techlib...oadband_Engine
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post #15 of 43
Also note that 'true' 64-bit processors only exist as the Itanium iterations of Intel processors.

No other processors to date are truly 64-bit. Itanium has (or had, at the very least) massive difficulties because it was hard enough to code outright for 64-bit architecture.
    
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post #16 of 43
Quote:
Originally Posted by GanjaSMK View Post
Also note that 'true' 64-bit processors only exist as the Itanium iterations of Intel processors.

No other processors to date are truly 64-bit. Itanium has (or had, at the very least) massive difficulties because it was hard enough to code outright for 64-bit architecture.
oh right
nearly forgot

all other CPUs have 64bit extensions in the instructions set right?
post #17 of 43
Quote:
Originally Posted by Mr.Pie View Post
oh right
nearly forgot

all other CPUs have 64bit extensions in the instructions set right?
I can't remember exactly how it works but if I remember part of it it is:

Instead of using 64-bit word length processing, there are extensions for handling 4x16-Bit word lengths at a time (32x2 essentially); where as the Itaniums are capable of handling a true 64-bit word length character.

That may not be 100% correct but the information is out there, check it out.
    
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post #18 of 43
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post #19 of 43
We've had 128-bit registers in our CPUs since the introduction of SSE in the Pentium III and Athlon XP.

Anyway, bitness is a complex issue.

When most people who have a clue are talking about what bit a processor is, they are referring to the size of the general purpose registers, or the size of the instructions used.

The PS3 uses a Cell BE processor. This chip has a 32-bit instruction set. The general purpose and FP registers in the PPE are 64-bit. It also has 128-bit SIMD registers. The SPEs are all 128-bit SIMD.

How does this compare to a modern CPU?

A Sandy Bridge has 64-bit general purpose registers for 64-bit instructions, plus the standard 80-bit x87 FPU. It also has 256-bit (SIMD) registers for AVX and SSE.

Various bus widths have been used to describe CPU bitness, but these are only really relevant to bandwidth, and not the kinds of instructions that can be executed. There are so many various buses of widely differing bit-width and clock speeds in modern processors that it's useless trying to define a CPU by them.

Quote:
Originally Posted by Skrillex View Post
Quantum computers don't even exist yet.
Been around in experimental stages for years.

You can even buy production versions now:

http://www.dwavesys.com/en/products-services.html
Edited by Blameless - 7/20/11 at 3:47am
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post #20 of 43
@Blameless,

I was under the impression that the largest character set in instructions, without regard to registers and cache, processed individually is 32-bit d-words; or two simultaneous 16-bit d-words...

I'm now confused by your statement. Please correct my mistakes though, to be sure.
    
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