The original Xbox 360 motherboard is called the Xenon with both a 90 nm CPU and 90 nm GPU, there has been system cooling revisions to it. Next was Zephyr motherboard with HDMI that was introduced with the Xbox 360 Elite and and some had newer "heat pumps". Currently on the market is Falcon with a cooler 65 nm CPU but still the same hot GPU as the Xenon.
It's well known that the next Xbox 360 motherboard is going to be Jasper and it going to have both a 65 nm CPU and a 65 nm GPU. Jasper is going to be a major advancement in reliability since it is going to run much quieter than previous Xbox 360 systems. Jasper's reliability is in part to the fact that there is no place on the motherboard that is going to be running as hot or as much power as previous Xbox 360 systems, also it might run a lot quieter since it will not need as much power. When Microsoft hired IBM and ATI to provide the original Xbox 360 CPU and GPU Microsoft put it in the contract so that the Xbox team will own the technology for the chips and can make subsequent reduced cost revisions to the chips. The Xbox one had leased technology from Intel and Nvidia and that is one of the main reasons for the change in CPU and GPU venders. Jasper is very real and they are testing prototypes right now. Word from Redmond is that progress on Jasper is going well and on schedule and you can expect it fall of 2008. My birthday is in October and I am probably going to upgrade to a Jasper Xbox 360 if my Xenon lasts that long.
Source: www.8bitjoystick.com
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