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2 same GPUs, different scores

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I have 2 HD7770s one is a

Sapphire Radeon HD 7770 GHz Edition 1GB

and the other a 


when i run the GPGPU benchmark the gigabyte (GPU1) is noticeably faster. 

Would this be because of differences in the cards or because of differences in how they are used?

I guess if i dont get an answer here i will have to take them out and reverse their order, oh the MB is an

Asus Z87-A ATX LGA1150




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Even if the cards have the same GPU and similar core clock and/or boost clock, their cooling and actual thermal status could be very different. Modern video cards could perform better if they're cooler, since their GPU could use boost clocks more at a cooler state. So even by using 2 of the same video cards, the scores could be different if one card runs cooler than the other.

BTW, according to the specs, your Gigabyte card uses 5000 MHz effective memory clock, while the Sapphire card uses 4500 MHz, so there's a considerable difference there.



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