Quadruple data rate
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Quadruple data rate (or quad pumping) is a microprocessor communication technique wherein data is transmitted four times for each clock cycle. Intel's Pentium 4 utilizes this technique to achieve an effective 800 MHz (200 MHz × 4), or more recently an effective 1066 MHz (266 MHz × 4). (Intel's Core 2 duo/extreme also uses a quad-pumped FSB)
Quad pumping is used in AGP and FSB
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