As we still have zero clue how general intelligence works, that is not even on the distant horizon and it is still completely unclear whether it is possible at all.
Intelligence is the ability to identify, store and use/manipulate information. Information itself however, is intangible. "Where is the sabre-tooth tiger lurking?" "How do I obtain food?" "How does the bird know how to build its nest?" - the answers to all these are information. How much does that information weigh? In its encoded form, from a stone tablet to a TCP packet, it can have weight. But the information itself? Intangible. Zero mass.
Then - consciousness. The ability to feel. Feelings are intangible as well. The experience of sensation is intangible. So combine feelings, which are intangible, with processing information, which is also intangible, and one gets an idea of the difficulty of understanding consciousness.
We could however make an intelligent machine, one that is somehow able to identify, store and use information to achieve some end. A conscious machine, one that can feel (and again, feelings are intangible) - that seems farther away. Feeling, that "motivates" or "drives" the use of information towards goals that produce positive feelings is far away. That would require the creation of an intelligent machine combined with a conscious machine, that can feel.
The processing of an intangible (information) driven by intangibles (feelings).
I think we're getting close to a system that can identify new information and can use prior experience to achieve a goal that is pre-programmed, but not driven by feelings. I'd call that an intelligent machine. We'd need to be careful about what goals we give it.