Hmm well since the northbridge is the same on all the three chipsets, the CPU, RAM, ROM, PCIe cards will be able to communicate at the same speed.
2. all of the chipsets support HyperTransport 3.0 and have the same transfer rate, which means data from the northbridge will be transported at the same speeds to the CPU, so that the CPU can process the data.
3.NB-SB Interface is the same for all 3 chipsets (A-Link Express III)
4. The southbridge is the same (not for for the 880g ), which means they do support SATA 6.0 Gb/s
So to conclude, Data will travel at the same speed on all the three chipsets. Which means that there is no difference in performance between the three chipsets.