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is x86_64 a x86 or x64?

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linux-howto

http://askubuntu.com – my ubuntu version is 12.04, and when cat /proc/version, it shows Linux version 3.2.0-23-generic (buildd@crested) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu4) ) #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 Linux yuzhe-HP 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux Here it shows the os is x86_64. To install oracle jdk over linux, install package comes with two versions x86 and x64. Which should I choose for a x86_64 system? (HowTos)