Here's a tool which can both check HPET status and toggle it.
"HPET Status" displays the current status, same as before.
"HPET" disables HPET and its memory decoding (at FED00000h).
Admin rights required, as usual.
I can make a quiet version too, that disables HPET directly without the window staying on the screen.
You could add it to the startup folder, so that its executed every time the system starts up.
Personally I see no need for disabling HPET, but anyway.
C7H is equipped with an external Pll, so the spread shouldn't be present anyhow.
There might be some autorules thou, which decide if the internal Pll or external Pll gets used.
Does the SB Spread Spectrum option in Extreme Tweaker not work?