On Sun, Jul 12, 2009 at 2:24 PM, T o n g<mlist4sunt...@yahoo.com> wrote:
> Can someone tell me what kind of Intel CPUs have that EM64T? Any easy > rule of thumb? E.g., can I safely assume all those Intel 64 Duecore are One needs to be careful with Intel nomenclature. Some CoreDuos are 32 bit only, but most if not all core 2 duos can do 64bit. Actually, 64 bit is pretty commonplace these days, unless you have a fairly old processor. But to be certain, the rule of thumb is to do a 'cat /proc/cpuinfo' and look for the lm (long mode) flag. The presence of that flag indicates 64 bit capability. Another caveat relating somewhat to Intel chips - it is best to query intel directly regarding the feature set of the intended processor model number, not only for 64 bit (which most will have) but for virtualization capability, which some will not have. I pointed this out at a gathering yesterday -- if you look at the more recent offerings from intel, some of the lower end CPUs will have VT capability, but other newer ones will not, and then later on, VT capability resumes. It's as if the feature is disabled in some of their processors. I surmise this only affects some virtualizattion. For instance, on my Q6600 (core 2 quad, not the most screamingly fast cpu, but more than adequate for my needs) I can do Virtualbox fine, but on my laptop (Core2Duo T5800) virtualization is not supported, at least not by Virtualbox, as the CPU seems to omit this feature. -- thanks for letting me change the magnetic patterns on your hard disk. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
