What effect do you suppose this to have? It will only disable overdrive for this segment inside the BIOS is protected by a checksum. Because this sum's algorithm is unknown, we can't do anything about it. You're right, the values are what overdrive offers as a maximum for overclocking using overdrive, but if they get changed, overdrive won't work at all. At least, this was the case for 3xx0 cards.
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