Hardware Secrets warns us to watch out for GeCube reviews on other websites:
You need to be very carefull when reading VGA reviews from GeCube on
other websites. GeCube is sending out "fine tuned" boards to media,
models that aren't easily found on the market. In our case, we've got
from them one Radeon X800 GTO running at 472 MHz for core and 1 GHz
for memory, while the original specs for this board is 400 MHz for
core and 1 GHz for memory. With this "fine tuning", GeCube Radeon X800
GTO would be faster than a Radeon X800 Pro (475 MHz for core and 950
MHz for memory).
The whole problem is that they didn't tell us that
the sample they sent us was overclocked. Officially, GeCube was
selling this overclocked model in a "special limited quantity" offer,
however this model is already sold out. Also, we couldn't find any
reference for the overclocked specs on the box, on the manual or on
their website of this model we've got. You can read more over here.