Macbook 6.1 Bus Speed 1066Mhz and 8GB 1333Mhz RAM

hi everyone.

first off, sorry english .

3 days ago purchased 2 4gb ddr3 1066mhz ram sticks total of 8gb ram , used them in machine. when looked @ system information showed 8gb of ram running @ 1333mhz [store mistake guess]. surprisingly, machine running nothing greatly. no battery loss, apps crashing, no overheat or ram ralated issue. gets weirder, bus speed running @ 1066mhz. question are:

1. machine showing 8gb of ram running @ 1333mhz in fact running @ 1066mhz along clock speed? or running both different speeds? [it sounds crazy].

2. can give me kind of issue in future?


in advance guys.
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here proves [i used geekbench & system profiler]:






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