4-bit, as opposed to 32-bit in computing, means that that much data can be processed at once by the processor, so that's been double. In order to harness this capability, programs have to take advantage of these larger chunks of data that can be" /> Mac Forums - View Single Post - 64 bit on Macs
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yogi

 
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64-bit, as opposed to 32-bit in computing, means that that much data can be processed at once by the processor, so that's been double. In order to harness this capability, programs have to take advantage of these larger chunks of data that can be used, so unless a program was written 64-bit from the ground-up, it cannot take advantage of 32-bit.

In Tiger, 64bit is not supported yet. In Leopard, it is, and according to Apple, 32-bit applications and 64-bit applications will run side by side flawlessly.

Many of the benefits in 64-bit coding are that programs become easier to handle and smaller in size, the performance goes up considerably (I don't have numbers) at least by a noticeable level, especially when processing a video, or converting songs in iTunes etc.
64-bit seems to be the new bitsize all chipmakers are aiming for now.

Hope that helps a bit.

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