![]() ![]() The PC number, 25600 in our example, shows the transfer rate measured in megabytes per second (MB/s). As a result, the data rate is effective the same as the RAM’s apparent clock speed in MHz. But because DDR transfers data twice per tick of the clock, the effective clock speed can be said to be double the real clock speed. ![]() In DDR RAM, the actual clock speed is half the data rate – 1600 MHz, in our example, though even that is stepped up from the RAM’s internal clock speed of 400 MHz through multiplicative pre-fetch bits. That number actually reports the data rate, measured in megatransfers per second, or 10 6 data transfer operations per second. That’s actually a bit of a marketing fib, but don’t feel bad: the misunderstanding is directly encouraged by PC OEMs and retailers. The first four-digit number, 3200 in our example, is often said to show the RAM’s clock speed in megahertz.
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