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SDHC1 reg key "BaseClockFrequency" does not affect SD clock value

description

This registry key is not overriding the SD clock:
 
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\SDHC1]
"BaseClockFrequency"=dword:16e3600 ; override the max clock rate (24 MHz default)
 
With this key disabled I expect SD clock to default to 48MHz. This is output with key commented out:
 
36100 PID:400002 TID:1aa0002 SHCSDSlotOptionHandler - called - SetSlotInterface : Clock Setting: 25000000
36104 PID:400002 TID:1aa0002 SDSetCardInterfaceForSlot - HC ClockRate differs desired setting: desired: 25000000

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