Hi,
At 260 MHz device has same real output as at 280 or 290 or 300MHz.
Means When I make the frequency higher then 260mhz - the device doesn't go up in real performance - only the expected performance goes up.

Now testing the device on ghash and will post here my experience after 24 hours.
Also will clock the device up to 280mhz so can compare shots from be controller and pool.