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[ubuntu] difference between i686 and x86_64

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linux-howto

http://ubuntuforums.org – I have Intel core 2 duo machine with the fallowing cpu details Architecture: i686 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 2 On-line CPU(s) list: 0,1 Thread(s) per core: 1 Core(s) per socket: 2 Socket(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 15 Stepping: 13 CPU MHz: 800.000 BogoMIPS: 3989.86 L1d cache: 32K L1i cache: 32K L2 cache: 2048K Architecture field of lscpu is i686 but the C (Hardware)