here is the latest round of my dtb for t9 and h96max+ rk3328 tv boxes - changes since last version:
properly enable dmc (i think this allows better memory timing)
raise voltage for the 1.392ghz clock (disabled by default) to the values which worked for @amirul as well
raise thermal trip points slightly to 85/95/110 degree celsius
add a rk3328-t9-fast.dtb which has the 1.392ghz cpu clock and higher memory clocks enabled (the 1.512ghz cpu clock is still disabled by default as its likely not working or too unstable in most cases)
the cpu performance ist about 5-10% better than my last t9 dtb for the regular t9 dtb and about 10-15% better than my last t9 dtb for the t9-fast dtb and as such the cpu performance is now about even with the mx10 box one ... i noticed that the usb2 port might be a bit unstable at times, so better use the usb3 port - maybe this is a general problem for rk3328 boards ...
best wishes - hexdump
rk3328-t9.dts
rk3328-t9.dtb
rk3328-t9-dtb.diff
rk3328-t9-fast.dtb
rk3328-t9-fast.dts
rk3328-t9-fast-dtb.diff