If you check out the TDX nozzle review, the TDX beats the RBX with the right nozzle installed. Its kinda confusing that, makes you think the tdx is worse...
With nozzle 5, and enough pumping power (probably enough to destroy the block, lol) it comes inline with a cascade pretty closely.
http://www.procooling.com/reviews/ht...e_tests_-_.php