This is one absolutely awesome SFF mod. SFFN forum member htalker, has created a 0.55L pocket eGPU. Based on the work of the always awesome Revoccases, htalker has put together the project based around an AMD Radeon RX6400 LP GPU. Performance wise, his TimeSpy scores were 3600 on PCIe 3.0, and 3700 on PCIe 4.0. Performance wise, that's roughly around a GTX 970, GTX 1650, or Radeon RX 480 for reference.
Check out his mod thread by CLICKING HERE.