Unless you mean your board doesn't have a multiplier option, the 64s can only have the multiplier changed down, they won't go up with the exception of the FX series CPU's those can go up or down.
So in your case the only way to OC the CPU is to raise the HTT beyond 200 which you already have, but keep in mind unless you underclock your RAM, you're also OC'ing the RAM, and looking at the RAM you have you should be able to hit 250MHz+ with that of course loosening the timings and upping the Dimm voltage, but those sticks should be able to OC really well so I'd suggest you keep it 1:1 with the CPU and just keep raising the HTT provided your temps are good which I'd assume they are with that setup.
Just remember to add vcore for CPU stability and Dimm for RAM stability but keeping RAM stable requires loosening the timings, raising the dimm, and sometimes it requires upping the voltage to the chipset since you are pushing it beyond it's normal total HTT 'Bus speed' 800 or 1000 depending on if the HTT link multi is 4x or 5x
Upping chipset voltage and raising the HTT beyond that of the boards specs will increase the heat on the NB which generally requires aftermarket cooling on that as well
EDIT: After now seeing the RAM section of CPU-Z you put up I suggest you go to 2.5 for stability on the ram for the CL.
The Cas latency and Cycle time have more effect on stability than they do bandwidth, infact minor influence on the bandwidth all together that's why you'll see people with 2.5-3-3-11 or something like that on the Cycle time. It's the two middle numbers that have the greatest effect on bandwidth