fierce Scuba @ http://loot-ninja.com/2007/12/18/how-to-spot-a-xbox-360-with-a-falcon-chip-and-why-you-should/
Here is how:
All you need to do is look at the UPC symbol and see the 175W, which is the wattage for the newer power supply. This confirms that a Falcon chip is inside and not the Zephyr, which is an older model.
The Falcon chipped models have a much less chance of failing due to aluminum heat sinks and uses much less power so will be a lot quieter.
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