Looks just like the Vector block I have on my VII, nice piece.
NBD: it certainly benches faster (VII), that's for sure. HBM can be OCed too, but it's capped at 1200mhz for the memory clock OC (stock is 1000). Without that water block, hitting over 2000 on the core would have been impossible. If I recall, it's about a 2000 point difference in Time Spy between stock air and 2100mhz core/1200mhz HBM at higher voltage under water. Massive difference.