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Originally Posted by mrmikel
The ugly fact about 32 bit operating systems is that they can really only use 3 gig of memory.
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32 bit OSs can use up to 64 GB of memory by using
PAE. The ugly fact is Microsoft does not employ it with non-Windows Sever offering. This is one way they differentiate their server and non-server versions. The 3 GB limitation is a limitation of 32 bit addressing however in the case of Windows it is an artificial limitation that has been imposed based on what kind of Windows license you have purchased. Take a look at the Windows chart at the above PAE link. Even 64 bit versions of Windows have artificial RAM limitations.
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Originally Posted by HarryT
... ie, the Win7 machine does the conversion 2.3x faster, despite having slower CPUs.
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You've only mentioned the clock speed. Just because one has a lower clock speed does not necessitate a slower CPU. If one is a Core Duo and the other is say a Core i5. The i5 at a slower clock speed will actually be a faster CPU. Clock speed comparisons are only an accurate preformance measure for the same product line.