How reliable is GPU-Z

nonxcarbonx

Distinguished
Jun 6, 2009
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18,790
GTX 260 Core 216 EVGA
GTX 260 Core 216 MSI

I put my system in sli, and used evga's precision overclocking tool to get a 694 core clock. When I don't have the cards in sli, gpu-z says only evga's is overclocked. When it is in sli, gpu-z says both are at the same clock rate. So since i'm running with sli right now, does that mean that the msi one is also overclocked or is that a misread by gpu-z?