system
Given the following post, respond as if you're commenting on Reddit:
human
[Dune] What kind of processing power does a mentat have?

Mentats basically have their minds transformed into supercomputers. So, what kind of specs would thy be having in terms of processing power, memory, storage, et cetera?

For instance, would a mentat have like a 5 gHZ processor with something ridiculous like a terabyte of RAM and like a petabyte of storage?
gpt
It's very difficult to do that kind of conversion in any kind of explicit numbers.  
That said, they're not shown to have radically larger storage capacity than baseline humans.  They seem to take in information in roughly the same way as baseline humans, and seem to do it in response to the problem at hand.  In essence, they use external storage.  Figure on about 100 terabytes of internal storage, on the high end of normal people.  
A clock-speed doesn't really make sense for the way a brain works, but even an average human brain performs many many more calculations per second than even the fastest known computers.  
A Mentat may gain some boost in physical ability via the sapho juice, but it's more likely that the Mentat's training instead allows them to better focus and direct the already existing processing power of their brains, and the sapho juice accentuates that focus and ability, rather than physically altering the speed of their brains.  
So, a Mentat's brain probably isn't that much more 'powerful' than a baseline human, it's that their operating system and processor is much better.