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InvisibleCosm
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AMD 's 64 bit processor and 32 bit processes
    #3582999 - 01/05/05 06:42 AM (12 years, 7 months ago)

Does a 64 bit processor perform 32 bit processes twice as fast.My guess would be yes,but a computer science teacher told me it didn't.Now I'm confused, was he wrong?


Edited by Cosm (01/05/05 05:05 PM)


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Offlineummikko
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Re: AMD 's 64 bit processor and 32 bit processes [Re: Cosm]
    #3583012 - 01/05/05 06:57 AM (12 years, 7 months ago)

He's not wrong. A 64-bit processor handles data in 64-bit chunks instead of 32-bit chunks. Also the registers are 64 bit. It is only faster IF the software you are using supports 64-bit operations. So far, most programs don't, so the processor is only given 32-bit operations and it never uses all it's potential. A 64-bit processor is twice as fast ONLY if all the operations in a given program require more than 32 bits to compute. For example, the calculation 2+2
would be just as fast in 64-, 32-, 16-, 8- and 4-bit machines, because it only takes four bits(three,actually) to calculate it
(0010+0010=0100).

Correct me if I'm mistaken somebody.


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"All substances are poisons; there is none which is not a poison. The right dose differentiates a poison and a remedy." -Paracelsius


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OfflineSeussA
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Re: AMD 's 64 bit processor and 32 bit processes [Re: ummikko]
    #3583041 - 01/05/05 07:25 AM (12 years, 7 months ago)

Quote:

For example, the calculation 2+2 would be just as fast in 64-, 32-, 16-, 8- and 4-bit machines, because it only takes four bits(three,actually) to calculate it (0010+0010=0100).




It takes much less die space to build a 4-bit adder than a 64-bit adder. The left over die space can be given to optimizations within the adder or high speed cache, etc. Generally speaking, a smaller adder has the potential to be faster than a large adder. In reality, there really isn't much difference... not enough to worry about.

There are very few places that one will benefit from a 64-bit cpu over a 32-bit cpu. As already stated, applications have to be written to take advantage of the extra bits available. Things like word processors, email programs, web browsers, and the like will see almost no benefit at all. Things like databases, and computational programs such as spice can see a decent improvement. Also, programs that deal with graphics or audio, such as a DVD player, mp3 encoder, SSL, etc can gain huge benefits when written for 64-bit.

The other area that 64-bit cpus are nice is memory and disk access from within the OS. A 64-bit cpu can address much more than the 4GB limit of a 32-bit cpu. (Granted, PAE allows up to 64GB to be addressed, but this is implemented through overlays into a 32-bit address space. The application can still only see 4GB at a time, even if the system has 64GB.) Even if you don't have more than 4GB of memory in a 64-bit system, the 64-bit virtual address space allows the OS to work a lot less trying to find an empty hole in virtual memory to place shared libraries, etc. With large disks, 64-bit addressing will speed up disk seeks (no more emulating 64-bit math on a 32-bit chip) as well.

> Does a 64 bit processor perform 32 bit processor twice as fast.

Your comp sci teacher was correct. A 64-bit processor will not perform twice as fast as a 32-bit processor. Think of it like a road between your home and work. Say it takes you 30 minutes to make the drive on a single lane road. If they double the width of the road to two lanes, does the trip go any faster? Perhaps the trip will be a bit faster due to less traffic congestion, but nowhere near twice as fast.


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OfflineRamlaen
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Re: AMD 's 64 bit processor and 32 bit processes [Re: Seuss]
    #3590716 - 01/06/05 09:54 PM (12 years, 7 months ago)

Its a good performance increase, not due to 64 bit vs 32. But overall the processor does well on par vs its 32 bit counter parts. Especially in memory intensive applications, mainly because the memory controller was moved onto the cpu for A64's


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