https://bugzilla.kernel.org/show_bug.cgi?id=206351
--- Comment #4 from Alex Deucher (alexdeucher@gmail.com) --- (In reply to Matt McDonald from comment #3)
This is the card and its specifications from the official website: https://www.sapphiretech.com/en/consumer/pulse-radeon-rx-5600-xt-6g- gddr6#Specification
The 1750 Mhz clock on the webpage is the engine boost clock which is inline with the settings for your card.
OD_SCLK: 1: 1780Mhz
With respect to the memory clock, The default clock on your board is 900Mhz and it has a 192 bit interface. GDDR6 sends data on the rising and falling edge of the wave, so you multiply it by two. Hence:
OD_MCLK: 1: 900MHz
900 Mhz * 192 bit * 2 = 345,600 Mbps = 337.5 Gbps
Which is right in line with the bandwidth for your card.