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As far as I know, there are no links to the setting. Adjusting S2K is normally done in a dual processor system.
AMD Athlon System Bus 2X (S2K Drive)
The AMD Athlon system bus is a high-speed bus that consists of a pair of unidirectional 13-bit address and control channels and a bidirectional 64-bit data bus . The AMD Athlon system bus supports low-voltage swing, multiprocessing, clock forwarding, and fast data transfers. The clock forwarding technique is used to deliver data on both edges of the reference clock, therefore doubling the transfer speed. A four-entry 64-byte write buffer is integrated into the BIU. The write buffer improves bus utilization by combining multiple writes into a single large write cycle. By using the AMD Athlon system bus, the AMD Athlon processor can transfer data on the 64-bit data bus at 200 MHz, which yields an effective throughput of 1.6-Gbyte per second.
Essentially, I would leave the bus drive alone and use the memory drive however consider that if you have any noise or EMI, increasing the drive strength on either structure will act as an amplifier to that noise, increasing it on the circuit as well.
It is merely a way to increase the current to the bus, similar to the memory data drive settings in the BIOS.
If you are overclocking the FSB and set S2k, you are essentially overdriving one side of the bus and the system can become unstable. It will not net any performance or stability in a single processor system.
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