I would suggest to play games on it. I usually am able to achieve high core & memory clocks without artifacting during stress. But it does crash when I play games so there is your real test before you go on.
Yes. The reviews usually achieve the same about the core clocks but your memory overclock is much higher than what they are able to achieve. As suggested, try playing games on it. That is the real test.
Since we don't know what GPU you have we don't know if that's good or not.