2.8GHz vs 2GHz 64bit

Dell Dell optiplex 745 desktop computer...
June 20, 2010 at 03:45:59
Specs: Windows XP vs XP 64
I figure that if a 64 bit processor can process 2 32 bit instructions at the same time the 2GHz processor is comparatively looked at as 4GHz (faster than a 2.8GHz 32 bit processor. How far off am I?) Keep in mind I have disregarded the product, and also the comparison is wanted using 32bit OS with 32bit processor / 64 with 64. Thank you. RIM

See More: 2.8GHz vs 2GHz 64bit

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June 20, 2010 at 05:21:39
A 64 bit processor does not process 2 32 bit instructions at the same time. Instruction length varies but only one is processes at a time, just as with 32 bit processors. With multiple cores more than one instruction may execute at the same time if more then one thread is ready to run. This is often not the case.

64 bit processors do perform better, but only when running a 64 bit OS with native 64 bit applications. With some application types the gain can be substantial, with others not much at all. With 32 bit applications most advantages are lost.

The principle advantages of a 64 bit OS are a much larger virtual address space (16TB vs 4GB) and the ability to address more physical memory. Performance gains are relatively minor in comparison.

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June 20, 2010 at 13:21:31
Helpful points that I may understand, or need clarification:
1) 4GB is no longer max physical memory with 64bit OS
2) a 32bit program (with 64bit OS and processor) will not improve vastly by any means

Helpful points that I do not understand:
a) virtual address space
b) the last sentence:
""Performance gains are relatively minor in comparison.""

And by the way, I was pretty vague with my comment/question, thank you for any misunderstanding.

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