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Support for real mode and virtual-8086 mode are absent in long mode and available only in legacy mode.
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And, modern CPUs are perfectly capable of running real mode in pure emulation. In fact, most programs run better in emulation, because you can control the virtual clock speed.
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Others, however, insist that there just aren't any good practical or theoretical reasons at this point for 64 bits on the desktop, and that making the hardware available won't magically create those reasons.
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The windows default 2-GB addressable user memory problem is actually a problem. I too work at a company that runs into the 2-GB barrier.
We have 64 bit CPUs which we are writing software for.
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Since 64-bit systems can process twice as many instructions per second as a comparable 32-bit system, 64-bit systems are definitely faster than their 32-bit counterparts.
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This is on crack. And wrong!
To repeat what others have said:
The Athlong 64 bit chip rocks for many reasons other than it being 64 bits. The 64 bit ness of it is just icing on the cake.
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For my debian pure64-bit install at least those extra registers have made all the difference in the world. It's really quite amazing the amount of speed that I picked up from going from a 32-bit install to a 64-bit install. But with the new Pentium 4's getting the amd64 extensions (or x86-64, whatever floats your boat), the only top-tier x86 platform that isn't going to have them is the Pentium M.
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This I hadn't heard. Cute -- Intel copying AMD's instruction set!