The three device IDs are the 687F:C1, 687F:C2, and 687F:C3 and the benchmark database entries suggest all three models feature 8GB HBM2.
I would take this information with a grain of salt but the scores suggest the slowest model could be faster than the GeForce GTX 1070, while the fastest Radeon RX Vega card may offer performance similar to NVIDIA's GeForce GTX 1080 Ti. It's hard to say as some of the scores are all over the place.
Expect to hear more later this month.