Memory Tables

I am trying to figure out why all the Bios files I examine with<br>
the Editor show much lower memory clock settings then what is being<br>
recommended online. My Card is a Geforce2 Pro DDR, the current memory clock tables are GPU-Core 200/Memory-200mhz.<br>
The settings below were found online, does the memory frequency get doubled? Some memory slots are even 166Mhz? Can I set the DDR memory at 400mhz or will this result in 800mhz final clock? Why are some memory slots set lower?<br>
<br>
GeForce2 MX 166/175MHz Core 166/175MHz memory <br>
GeForce2 GTS 200MHz core/333MHz memory <br>
GeForce2 Pro 200 MHz core/400 MHz memory <br>
GeForce2 Ultra 250 MHz core/460 MHz memory <br>
<br>
Please Advise.