Bios RAM reading

I just install A-Data RAM 2X1GB ( 667Mhz) .
When I download and run PC Wizard 2007 , it told me that my memory speed is only 333Mhz . { DDR@-SDRAM PC2-5300(333Mhz) }
I went into my desktop BIOS to check and it said current memory speed 667Mhz.
Can anyone help me explain why PC Wizard 2007 is not registering that my RAM is running at 667Mhz as it suppose to be and only 333Mhz.
I also downloaded another software SIW and it said same ,ie, 333Mhz.

Can someone help explain the difference ?.
tks,
andy