Its a palit with Samsung memory. If you have Micron GDDR5 memory then you really can't clock it much higher than 4300. If you have still Samsung memory but a bad cooling solution (f.e. inno3d) then it might also only let you clock to ~4400.
I can mine with 4800 memory clock on my Palit, will check the speeds right now.
same thing can't oc above +600-700 or artifact will be all over the place, this with g1 gaming, samsung memory, what palit do you have jetstream or gamerock?
I just checked GPU-Z, and it says I've got GDDR5 (Micron). I've never heard of Palit before. Even more interesting that Amph has the same Samsung memory as you, but he's seeing the same OC limits that I am... If there's a card out there that can OC that much more, I'm pretty damn tempted to return my cards, get a refund, and purchase them instead - and something tells me I'm not the only one that feels this way.