From the press release:
The Alienware Area-51 5500 desktop, Area-51 ALX desktop, and MJ-12(R) 5500 workstation will come loaded with the highly advanced power of two execution cores on a single chip to deliver breakthrough performance for gaming, digital content, and other demanding applications.
Alienware systems featuring the dual-core Intel Pentium Processor Extreme Edition 840 support Intel Hyper-Threading technology. This allows Alienware systems to offer advanced multitasking potential by supporting up to four threads and accommodating multiple applications running simultaneously, such as playing a game while also streaming video in the background. Running at 3.2GHz, the Intel Pentium Processor Extreme Edition 840 provides Alienware systems with 2MB L2 cache and 800 MHz FSB for faster information flow and great performance for data-intensive applications like gaming, video editing, and 3D rendering.
Dual-core-processor powered Alienware systems will also deliver cutting-edge performance enhancements like dual-channel DDR-2 667 memory and innovative Intel Matrix Storage Technology through the powerful Intel 955X Express chipset. Intel Matrix Storage Technology provides enhanced storage and safekeeping for digital content such as video, audio, photos, music libraries, and 3D gaming environments. Backed by Intel Execute Disable Bit technology, Alienware systems bring additional peace of mind by providing protection against malicious virus attacks.
To find out more about Alienware systems with dual-core processing and sign-up for updates on system availability, please visit http://www.alienware.com/955x.