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[Erfan223]

Well most people saystick a flash light on the right side of the 360 horizontally.If you see a heatsink blocking your view of the dvd drive than you have a 65nm chip.But thats not quite true.It depends on the chip in the 360 being used.Most elite consoles and refurbs have the extended gpu heatsink as said above.Another way is by looking at the power brick to see if you have a 175w or 203w Power brick.175w is most likely the 65nm and 203w brick is a regular console.Some have the new heatsink and the 203w brick.And their is also lot numbers that give you a chance to see if you have the 65nm technology 360.I dont no them but you can tryi googling about it.