The board is generally working , but the thickness of the laminate is too low, and the contact in the DDR4 socket is very weak, so sometimes not all pins are contacting correctly. The user instructions are in chinese and very short, do not explain what is the meaning of the particular pins and what state they should have during the test, only abbreviations are available. To perform the test you must hold all the time the microswitch, no stable on/off function. Test results can differ from board to board/chipset, so comparability of results is conditional.
Excellent quality. Fast delivery responsible seller. I recommend.