X25X algo is the one and only GPU only algo not for all Nvidia GPUS but also for cards that have 6gb or less because it doesn't require memory hard operations.
For all the Nvidia cards from 1050ti 2 gb up to 1080 ti can all be mined without the fear of ASICS and FPGAS around.
T-Rex has the algo optimised maximum that is why no private miners or no new faster miners for X25X.
Today is the good information day lol