The HP Pavilion a305w desktop PC features an Intel Celeron processor running at 2.7 GHz with a 400 MHz front-side bus. It supports a maximum of 1GB of RAM, with 256 MB installed, and utilizes DDR SDRAM. The system includes a 40 GB hard drive, a CD-RW drive, and integrated Intel Extreme graphics with up to 64 MB of shared video memory. It has a standard audio setup with AC97 audio and a 10/100Base-T networking interface. Users may experience difficulties with modern websites and video formats due to the CPU's limitations and available RAM. For further specifications, users can refer to the provided Intel datasheet and HP documentation links.