The problem with centrally planned economies wasn't one of processing power, it was one of information. The market is essentially based on "actions speak louder

The problem with centrally planned economies wasn't one of processing power, it was one of information. The market is essentially based on "actions speak louder than words": if someone is willing to spend their hard-earned money on something, this reveals their preference for this thing. The market aggregates these preferences, incentivising production that meets this demand. Without a system for people to express such preferences, it's impossible to determine what to produce, no matter how much processing power is available, because one cannot know what people want. If people were given some allocation of credits that they could spend to indicate what they'd like, then that's just a market under another name.