The Pentium D is a series of microprocessors that was introduced by Intel at the Spring 2005 Intel Developer Forum. A 9xx-series Pentium D package contains two Pentium 4 Cedar Mill dies, unlike other multi-core processors (including the Pentium D 8xx-series) that place both cores on a single die.

The Pentium D was the first announced multi-core CPU (along with its more expensive twin, the Pentium Extreme Edition) from any manufacturer intended for desktop computers. Intel underscored the significance of this introduction by predicting that by the end of 2006 over 70% of its shipping desktop CPUs would be multi-core. Analysts have speculated that the clock rate race between Intel and AMD is largely over, with no more exponential gains in clock rate likely[citation needed]. Instead, as long as Moore's Law holds true, it is expected that the increasing number of transistors that chip-makers can incorporate into their CPUs will be used to increase CPU throughput through other methods, such as adding cores.