Same overall efficiency as reactor 9, with a cheaper construction cost.
It has way less power output though.
I prefer it because I find 6 chamber designs unwieldy to use in practice relative to 5 chamber designs.
EDIT: My reactor is the most efficient reactor in this thread when measured by "Total profit per uranium per cycle in UU matter" and it should be put in the OP because of that: https://docs.google.com/spread…SGhycXFoamxTLUZYckE&gid=1
Also if anyone out there has a reactor design that is more efficient when measured in "total profit per uranium per cycle in UU matter" then I'd be very interested in seeing it.
The "total profit per uranium per cycle in UU matter" is different depending on wheather or not you count using scrap for mass fabs. Without the use of scrap the running cost of your reactor makes it an effective eff 3 reactor (the first page has about half a dozen ones that fare better). On averadge for your reactor to reach a max eff of 4.25 you would need to feed your recyclers 3264 pieces of garbage every cycle.