Try something like 1100mhz/1200mv core
If that still fails;
Try to see if its a power limit issue. If it is, it might be reducing your core clock [resulting in less VDroop, so a spike in voltage] then it would go back to regular clocks and voltage would drop back down.
Just because the clocks are shown as not budging does not mean they are not. GPU usage may instead be the variable that represents throttling. For example, on the original bios for my Vapor-X, throttling was represented by reduction in core/memory clock. GPU usage remained at 100%. Now it shows static core/memory clock, but GPU usage may drop to 64%, for example.
Also, do any backplates fit this card? I would feel a lot safer putting some Fujipoly on the rear of the PCB to connect it to a backplate rather than jury rig a heatsink on it and risk shorting..
Edited by Derpinheimer - 1/30/13 at 9:51pm