Quad Data Rate
QDR is the technique of transmitting four data per clock cycle instead of just one. With this technique the device achieves a transfer rate four times higher compared to a standard device using regular transmission under the same clock rate.
This technique is used on the external bus of Intel processors like Celeron D and Pentium 4.
Since the device achieves a quadrupled performance, normally the clock informed by the manufacturer isn’t the device real clock but its “performance”. For example, the Pentium 4 external bus is said to work at 400 MHz, 533 MHz or 800 MHz (depending on the model), but in fact it works at 100 MHz, 133 MHz and 200 MHz, respectively.
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Originally at http://www.hardwaresecrets.com/dictionary/term/226
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