Pentium D is a series of microprocessors introduced by Intel at the Spring 2005 Intel Developer Forum. A Pentium D chip consists of two Pentium 4 Prescott processors on a single die.
Hyper-Threading Technology (HTT) is Intel's trademark for their implementation of the simultaneous multithreading technology on the Pentium 4 microarchitecture. It is basically a more advanced form of Super-threading that first debuted on the Intel Xeon processors and was later added to Pentium 4 processors. The technology improves processor performance under certain workloads by providing useful work for execution units that would otherwise be idle, for example during a cache miss.
A dual-core(or core 2 duo) CPU combines two independent processors and their respective caches and cache controllers onto a single silicon chip, or integrated circuit. IBM's POWER4 was the first microprocessor to incorporate 2-cores on a single die. Various dual-core CPUs are being developed by companies such as Motorola, Intel and AMD, and are scheduled to appear in consumer products in 2005.
Celeron, A brand name for a line of Intel microprocessors introduced in June, 1998. Celeron chips are based on the same P6 architecture as the Pentium II microprocessor, but are designed for low-cost PCs. They run at somewhat lower clock speeds (266 and 300 MHz) and are not as expandable as Pentium II microprocessors.