The latest T-Rex Nvidia GPU miner version 0.11.1 brings very significant increase in the hashrate you get for the X25x algorithm that was recently added as supported… up to 3x the speed. The X25x algorithm is used by the SINOVATE (SIN) project (the former SUQA) and the performance you get with the latest T-Rex is up from abut 2.3 MHS for a single GTX 1080 Ti to about 6.8 MHS per card, or with other words from about 14 MHS to about 41 MHS for a 6x GTX 1080 Ti mining rig. The latest version also brings some new features and fixes to make the miner more usable and problem free.
Do note that the T-Rex is a closed source miner with 1% development fee built-in. Also make sure you have a recent video driver installed (the latest for CUDA 10 support) as the binaries for both Linux and Windows are compiled for CUDA 9.1/9.2/10.0.