Graphics card won't overclock while playing Source games

cobalt77

Honorable
May 14, 2013
27
0
10,530
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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