Buy it or NOT

I wanted to increase the memory of my PC , I have
Gigabyte GA-8IR2003 (REV.2) motherboard and a DDR333 256MB CAS2.
Stick.
So i waned to buy a Kingston 512MB Stick , but i only found in th
market a Kingston DDR400 512MB CAS3 , s
i wanted to know if it will be compatible with my PC or not since th
motherboard manual says that it only supports 2.5V DDR DIMM ? an
will the total RAM Become 768MB
Knowing that it doesnt matter with me CAS3 , 2.5 or 2 .
than

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