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It would be helpful if ifixit would use a spectrum analyzer to figure out what speed the DDR and the CPU were running at, since these numbers are set by the software.
Looking closer, it seems obvious that the DP2700A1 chip has the HDMI traces connected to it, so this is apparently some kind of HDMI transmitter? Does anyone know who makes this chip? It has a large M on the chip, which may be a clue to the manufacturer.
It would be interesting to Ohm out the connection to the HDMI connector to see if it connects directly to the A8 CPU, or if it is possibly connecting to the 338S00057 chip. This would tell us if the A8 has HDMI built in, or if Apple is using a 2nd chip to create HDMI from some other signal like LVDS or Lightning serial.