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AMD’s R600 die gets pixellated
As you can see, the chip location on the packaging is rather interesting, rotated at a 60 degree angle - but do not be surprised, since this is not the first case of GPU manufacturers rotating the chip on the packaging. There are two reasons for that: first one is the fact that AMD needed more room for resistors which can bee seen around this big die and second is far more important - to shorten the traces to video memory as much as possible, in order to reduce the EM noise produced by the PCB.
Since the R600 comes with 512-bit memory controller, rotating the die was pretty much the only way it could get to stratospheric clocks of both GPU and GDDR-3/GDDR-4 memory.

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