Hi, I recently bought this Xbox 360, it's the Halo 3 edition, but the power port doesn't match the model it should be. Theoretically, it should be a Xenon or Zephyr based on the date (2007-08-13), but it has a 175W port. I opened it up and this is what it looks like. Can anyone tell me what motherboard it actually is?

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That date is too late for it to be a Xenon and the Halo 3 consoles were all Zephyrs or Falcons.
It's not exactly easy to identify from that angle when we can hardly see the board, and you haven't shown the power socket at all, but from what I can see I think it's a Tonasket -
1) It's got the black PSB Southbridge so it's a Jasper or Tonasket (so you must have misidentified the power socket).
2) The GPU heatsink is the aluminium version (which they went back to with Tonasket).
3) And there doesn't seem to be any silkscreen for a third coil which would make it a Tonasket.
So someone must have swapped the board. Pretty common thing to do with these consoles - putting a reliable motherboard in the limited edition shell.
Best guess is a Tonasket, there's only space for 2 VRM coils. It's plausible for it to be a shell swap because every board that came with the Halo 3 consoles were defective (not including boards that were later serviced by Microsoft).
Feel free to send pics of the power port.
A JTAGged one. Does it boot into the regular firmware or does the JTAG work?
That's an RGH
I actually googled for the chip image and it said it was a JTAG. My bad if it's a RGH.
JTAG doesn't use a chip.
Tomato tomato. They do the same thing was commonly just called jtagged either way
Yeah they do the same thing, but they are not the same thing.
Ya its two ways to skin a fish.