256MB Ram (DDR 266) + one 512MB Ram (DDR 333)??

[yoganand]

Hi every body,
My system have two numbers of 256MB Ram (DDR 266) + one 512MB
Ram (DDR 333). Like this combinations of different bus speeds will give optimum capacity of Ram or not? Please reply
My system Processor is P4 with 2.4 and Mother board is Intel 865 GBF

Thanking you
YOGANAND