Hi, I have a problem with my RAM, so I have 1GB DDR2 SDRAM, but PC uses only half of it. SO in BIOS I can change RAM's clock from default 200MHz to 266MHz, but RAM is PC2-6400 400MHz. What I can or have to do, to use full RAM?? Photos attached from CPU-Z info. I run Windows XP SP3, but Windows 7 shows me the same.