The interval for your mem is [900-1300] , meaning that you will only be able to uc/oc to 900 or max 1300. Anything else will not be applied. Same goes for Core.

Sad to say, but you could do like me, flash the card in win with settings that you know work or have stresstested and then you should be able to uc/oc further (within the interval). Sadly I have not tested how the interval is changed if for example you would flash it wíth 920/300.