Gigabit performance on the two boards is a mixed bag - the K8TPro-939 scores about 120 Mbits/sec faster than the Soltek 3901a, but at a cost of about 7.5% higher CPU usage. In general, 82% efficiency with Gigabit Ethernet is nothing to scoff at.
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Soltek's K8TPro-939 manages to edge out the QBIC 3901a by about 17 seconds in this benchmark. Over the course of about 15 minutes this gives the K8T800Pro an edge that is only a couple percent higher than the 3901a.