Don't you have power saving disabled? First thing I thought of.
Benchmarks are a lottery. Same phone, same conditons and slightly different scores. Especially when running one after another
acutally, for best results for benchmarks the best you can do is cool down the phone. if the temperature of the chipset inside is cool enough it will run on full power. high temperatures = decrease in GHz used for both S800 and Adreno 330
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