|FSB & DDR speeds are bogus...they are theoretical, not actual. You should always work with actual frequencies.|
On AMD socket A systems, FSB = frequency x 2. So when you see 266MHz FSB, simple divide by 2 to get the actual frequency. 266/2 = 133MHz.
On Intel socket 423, 478 & 775 systems, FSB = frequency x 4. So when you see 800MHz FSB, divide by 4....800/4 = 200MHz frequency.
ALL DDR RAM (DDR1, DDR2, DDR3) speeds should be divided by 2 to get the actual frequency. DDR400/2 = 200MHz. Or if the RAM is rated by bandwidth, PC3200 for example, simply divide by 16. PC3200/16 = 200MHz frequency.
AMD systems are relatively simple to configure. All systems prior to the Atlon 64 should be setup with a CPU:DRAM frequency ratio of 1:1. In other words, for best performance, the CPU & DRAM frequencies should always match. If the CPU is at 133MHz, the RAM should be at 133MHz...if the CPU is at 145MHz, the RAM should be at 145MHz, & so on.
Athlon 64 systems don't have a FSB so none of the above applies.
Unfortuinately, your board doesn't have all the necessary options for decent overclocking. That is tyical of most VIA based boards. There's no voltage adjustment & no way to lock the PCI/AGP, so that severely limits what you can accomplish. Just do as I explained. Start with both the CPU & RAM at 133MHz (aka 266MHz FSB & DDR266), then increase the CPU frequency a little at a time. The RAM will automatically overclock along with the CPU. Start by raising the CPU freq from 133MHz to 140MHz & see what happens.