This desktop features 4GB (2 x 2GB) of DDR2 system memory—enough for the most demanding users, gamers and multimedia professionals. DDR2 is slightly faster than DDR, the previous standard in system memory.
Data travels to the processor along the frontside bus. The faster data travels, the faster everything works. This desktop features a 667MHz frontside bus.
Processors search for the same data over and over. L2 caches keep this data neat, organized, and nearby so it can be retrieved more quickly. This 2MB L2 cache is large, providing a potentially significant boost in performance.
Hard drive: This hard drive features a 320GB capacity—perfect for robust collections of music, movies and multimedia.  This drive’s data disks spin at 7200rpm, providing faster-than-average access to your files.

Blazing-fast wireless N: Built-in 802.11bgn wireless LAN lets you take advantage of the speed of the latest and fastest networks, as well as networks using the most popular standards.

Built-in Bluetooth: Enjoy easy communication with PDAs and other Bluetooth-enabled devices.

DVD SuperMulti drive: Use this slot-load drive to burn DVDs and CDs to share your files, music mixes or home movies. You can even burn DVD-RAM discs—specially-formatted discs that let you drag and drop, or write and rewrite your files up to 100,000 times.

Touch-screen technology: The IQ504 features a 22” high-definition, widescreen BrightView touch-screen LCD with tilt adjustment. Touch-screen technology puts your digital life at your fingertips with fast, easy access to info, entertainment and social networks. The stylish design features sleek piano black with elegant espresso side-panel highlights.

Microsoft Windows Vista Home Premium (64-bit) with SP1: Windows Vista Home Premium, featuring the elegant Aero interface, is the operating system for homes with advanced computer needs. You’ll be able to use your desktop more effectively and enjoy new entertainment experiences—all with the benefit of added security and reliability. This 64-bit edition of Vista Home premium is for serious computer users who have advanced high-performance needs and are running a computer system with a 64-bit processor.

Video/audio: This desktop Intel Graphics Media Accelerator X3100 and 128MB of dedicated video memory, an addition to the main system memory, and up to 358MB total graphics memory. This video memory is perfect for everyday activities like casual movie watching or gaming. The built-in, high-performance 2.0 speakers provide compelling 3D sound.

Media card reader: Seamlessly transfer images from your digital camera or camcorder. This 5-in-1 reader is compatible with Secure Digital, xD, Memory Stick, Memory Stick PRO and MultiMedia Card.

Built-in webcam: Turn your next instant message into a live video chat with the integrated webcam and microphone. Or take still photos and short video clips that you can edit and email.

Cool lighting: HP Ambient Light lets you set a mood, or see your keyboard in the dark