Until next year when AMD releases the same APU technology in a single dye, with granted 4 instead of 8 cores. It will also have HSA, which I believe the Xbox lacks.
As somebody who works in the fuel industry. We easily can keep about 3-5 liters of fuel at ~15,000 psi for injector testing in about ~1kw to 2kw watts of power (with 350F heating). So not super far off.