Graphics card won't overclock while playing Source games

I have a Geforce GTX 670 FTW overclocked to 1267mhz. It runs at 1267mhz in most games, but whenever I try to play a Source game such as Garry's Mod, Half Life 2, or TF2, the card won't go above the stock clock rate (1005mhz)

Does anyone have any idea what could be causing this?
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  1. Solved the problem. I just had to increase the gpu clock offset from +120 to +130.
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