Microsoft Xbox 360 -
Microsoft is positioning the Xbox 360 console as the center of a digital connected home - providing much more than just game play. The way they are talking about it, it almost seems like it could even supplanting the Media Center PC. Powered by a custom-made IBM PowerPC-based three-core chip running at 3.2GHz, and supported by 512MB of GDDR3 RAM, the new Xbox has the raw processing power to deliver more than all but the most hot-rodded PCs can today. Video and graphics performance is powered by a new ATI GPU running at 500MHz, with 10MB of embedded DRAM.
Sony Playstation 3 -
The big deal with the Playstation 3 is that it sports Sony's new Cell Processor that was jointly developed by IBM, Sony Group and Toshiba Corporation. It also features a new graphics processor (RSX) co-developed by NVIDIA Corporation and SCEI, and XDR memory developed by Rambus Inc. To really rub it in, it also adopts BD-ROM (Blu-ray Disc ROM) with maximum storage capacity of 54 GB (dual layer), enabling delivery of entertainment content in full high-definition (HD) quality, under a secure environment made possible through the most advanced copyright protection technology. To match the accelerating convergence of digital consumer electronics and computer technology, PS3 announced support for high quality display in resolution of 1080p in addition to 720p/1080i.
The above information is from a web which does some performance overview of both products.Click here to see the comparison.
And I've found another site that compares those products in more technical way.Please click here to visit it.
You can view the official sites of those products by click on the images.