There are multiple factors in addition to the GPU model that can affect RAC include CPU type and core frequency, bandwidth between the GPU and CPU, Windows or Linux OS, and the number of tasks running at once on the GPU.
I looked through the host list and did not find a match for the 7850. However, I did find another user with a 7970 and Core 2 processor with a similar frequency to the frequency of your host. The RAC on the Core 2/7970 host is approximately 44K and based on the execution time of the tasks, it looks like this host could reach 49K with a single GPU. The 7850 has approximately 46% the single precision performance of the 7970. With that, you can get a rough estimate of what the RAC may be for the 7850. I would estimate 20-25K with the 7850 and a Core 2 2.66 GHz processor.
ATI HD 7850 1GB DDR5
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There are multiple factors in addition to the GPU model that can affect RAC include CPU type and core frequency, bandwidth between the GPU and CPU, Windows or Linux OS, and the number of tasks running at once on the GPU.
I looked through the host list and did not find a match for the 7850. However, I did find another user with a 7970 and Core 2 processor with a similar frequency to the frequency of your host. The RAC on the Core 2/7970 host is approximately 44K and based on the execution time of the tasks, it looks like this host could reach 49K with a single GPU. The 7850 has approximately 46% the single precision performance of the 7970. With that, you can get a rough estimate of what the RAC may be for the 7850. I would estimate 20-25K with the 7850 and a Core 2 2.66 GHz processor.