По коннектору питания: 
Или по маркировке, не вскрывая коробку:
Напомню основные отличия чипов. Техпроцесс:
* Jasper Dissection
Xbox 360 Revision: CPU | GPU | eDRAM
- Xenon/Zephyr: 90nm | 90nm | 90nm
- Falcon/Opus: 65nm | 80nm | 80nm
- Jasper: 65nm | 65nm | 80nm
The new GPU is around 77% of the die area of the old GPU, but the eDRAM appears to be unchanged at 80nm (chalk up the difference of 4mm to differences in measuring the die with a ruler vs. calipers). Compared to the Xenon platform, the GPU is now 66% of the original GPU die size, meaning the GPU actually shrunk more than the CPU in the move to 65nm.
И как следствие, теплообмен:
* Power Consumption
Xbox 360 Rev: Idle | Halo 3 | Rockband2 | Gears of War2 | BioShock
-Xenon : 2.3W | 155.7W | 177.8W | 167.7W | 177.1W | 172.0W
-Falcon: 2.8W | 101.4W | 121.2W | 112.8W | 121.5W | 115.5W
-Jasper: 2.0W | 093.7W | 105.9W | 101.0W | 105.9W | 098.1W
