I just recently downloaded a program from http://www.cpuid.com/cpuz.php to check if my ram was running at dual channel after i installed a new chip, it is. But then i saw somethng about the frequency running at 266 MHz. My first question is, is frequency and bus speed the same? And if so why is it only running at 266 MHz when the ram says on the box 667/533/400, does the speed depend on something else, say my motherboard? I currently have two PNY 1 GB PC-5300 DDR2 and two PC-4300 DDR2 512MB pieces that came with the computer.