Poweroid 9210

Poweroid 9204

hyperthreading

Hyper-Threading Technology

Intel Pentium 4 Processor with hyperthreading

Hyper Threading in CPUs

Hyperthreading technology advances

Intel's Pentium 4 Hyper-Threading Technology*

From Sharky Extreme:

"Both Intel and AMD have been waging a core speed war for quite a while now, with Intel really pulling out the big guns with their multi-GHz processors. Relative performance levels are still quite close, due to the differing architectures of the Pentium 4 and Athlon, which basically allow AMD to stay competitive at a lower clock speed, while Intel can seemingly raise the GHz bar anytime the company chooses. So it's really no shock that Intel has released a 3.06 GHz Pentium 4, but the new technology the processor contains is quite surprising.

Along with a high-end clock speed, the new Pentium 4-3.06/3.2/3.4 GHz etc also feature Hyper-Threading Technology, which basically allows a single processor to appear as two logical processors to the operating system and applications. We'll get into a bit more detailed look at the technology later on, but the main emphasis of HT is in making the processor itself more efficient and utilizing clock cycles to their utmost. This is a direct departure from jacking CPU clock speeds higher and higher as the primary means of processor design, and takes a more refined approach."

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Other Reviews on this subject: 

Active Hardware

Detailed review at Anandtech

In-depth article on Hyper-Threading