If it clocks down during gaming then the overclock was not stable. This is common. You need to flash the orig bios back to the card, and figure out what the actual stable clocks are. then upload the bios and let me know what you want changed.
Also you need to know that the card may have once been stable at some clocks, but then it became unstable after some time. This is degradation. It's something that is real and we have to live with it. My best advice is to find your max stable frequency, and then back it down a bit from there.
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