It is normal. The RAM and the CPU FSB that you're changing share that number basically. If the option isn't there in the BIOS for you to change then it's automatic, but there are ratios you can set if your board has those options. You want a 1:1 ratio with your CPU and RAM, so when you're raising your CPU FSB You're raising your memory FSB which I don't advise doing unless you know what you're doing.
To OC your ram takes a lot of patience, more so than CPU OC'ing I think, takes constant testing using memtest86+ to make sure you aren't getting errors, adjusting timings, voltages, etc...
So yes your RAM is overclocked right now because like I said somewhere in the BIOS it's set at the specific ratio, If your CPU frequency is set at 200(400) and your RAM speed is 133(266) then your ratio is like a 6:4 Ratio.......if the options are available and you are able to change that ratio to 6:6 or 1:1 then your RAM would jump up to 200(400) or in this case since you changed it to 215 it'd jump it to 430 which would more than likely kill it.