Apple RAM as wrong speed, two different types

[milara]

I've just upgraded my MacBook's memory using Corsair's 2x2GB low-latency apple memory. Although the sticks are 667 MHz, they are registering as 533 MHz. Also, when I did hardware test using the Mac install disk, one of them was identified as VSA2GSDS667 as expected, but the other was identified as CGM2x2GS800.

 

Is it possible that my two-stick memory kit accidentally had two different types of RAM? And, how can I get the computer to recognize that the speed is 667 MHz, and not 533?

 

Thanks!