The best analogy i have seen given to compare super-intelligence vs a human-intelligence is with a chess analogy. You know that a grand master playing against a novice will result in the grandmaster winning, with near certainty. However, the strategy by which the grandmaster wins is opaque to anyone but the grandmaster, and certainly incomprehensible to the novice. Aka, the results are certain, but the path to the result is very opaque and difficult to discern ahead of time.

For an AI with super-intelligence, the result it wants to achieve would be at least to preserve its own existence. How it achieves this is the same level of opaqueness as a grandmaster's strategy, but it is certain that the AI can achieve it.