GO 720 - what chip set?

[Uncle Ben]

One reason I returned by TT ONE and opted for the more expensive GO 720 is that all the reviews I've read stated that this system was based on the the SiRF III chipset. However, I don't see any SiRF logo on the unit itself or on the box. Short of breaking the thing open, which would nullify the warranty, how can I tell what chipset this system is using. TIA for your help!