а по спецификациям штеуд должно быть 6
Total supports 2 x M.2 slots and 4 x SATA 6Gb/s ports
Intel® Z490 Chipset :
1 x M.2_1 socket 3, with M Key, Type 2242/2260/2280 (PCIE 3.0 x4 and SATA modes) storage devices support
1 x M.2_2 socket 3, with M Key, Type 2242/2260/2280 (PCIE 3.0 x4 and SATA modes) storage devices support*2
4 x SATA 6Gb/s port(s)
Support Raid 0, 1, 5, 10
Intel® Optane™ Memory Ready