Help setting up new memory

i purchased 2x 2gb = 4gb total memory

in the BIOS i changed the voltage to 0.40 (2.2v)

but i noticed that in memory frequency(mhz) it says "800" instead of 1066. so what i want to fix is the 800 mhz and change it to 1066 which is what it suppose to be, in order for it to work as advertise, what do i do?



product name
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Kingston HyperX T1 Series 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model KHX8500D2T1K2/4G

 

What motherboard do you have? It probably only supports 800MHz