Well when you lock the AGP the PCI is automatically locked. WIth those boards in the BIOS theres just an option to set the AGP frequency at 66MHz, this is locking it.
If you've pushed your CPU FSB to 209 then yeah you're overclocking your memory as well.
Unless you put the memory on a different ratio than the CPU it will be timed exactly with the CPU. You want a 1:1 ratio for best performance, but you should know what you're doing when it comes to OCing RAM because it's a bit different than OC'ing the CPU.
If you have PC3200 RAM either change the CPU
RAM ratio or learn how to OC the RAM.
Take not though, that when you increase the FSB of either the CPU or the RAM then even if you have DDR500 RAM it won't matter if your CPU can't communicate to it at that speed.
So trying to find a balance between a high CPU Clock and keeping it at 200FSB with a 1:1 ratio is ideal.