The easiest and most reliable thing to is to get an amd64 install image and to boot the CD and see if it runs. But if EM64T isn't set it almost certainly won't work. 2. Which sets shall I use for an Intel 64 bit processor - amd64? A bit worried since wikipedia page below says there are differences between amd64 and intel 64 http://en.wikipedia.org/wiki/Intel_64#Intel_64 the following is fuzzy but should give you the right impression: 1. Intel produced "IA64" which is a 64-bit processor that is significantly different from i386. It was going to be the new thing, but has pretty much faded into obscurity. I have never actually seen one, nor have I logged into a machine running one. 2. AMD produced a 64-bit processor called "x86_64" or "amd64" (variously, by the different OS/distributions), which is more like an i386 with longer addresses and more registers. Later, Intel processors supported the AMD instruction set. cpuctl identify will show this as EM64T. NetBSD calls this "amd64". gcc calls it "x86_64". There is perhaps a nit that x86_64 refers to the CPU itself and amd64 to the machine architecture, but because there aren't really systems with the cpu with radically different architectures that's kind of academic.
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