(Your link accidentally included the end of sentence period)
"KVR800D2N6/2G 2GB 800MHz DDR2 Non-ECC CL6 DIMM"
Short answer to your question is yes, sort of. The long answer is:
Because DDR data transfer data on the rising and falling edge of the clock signal, RAM manufacturers will refer to RAM as Double the frequency. So although CPU-Z shows your RAM at 419.7 MHz, the memory companies and almost all users (unless they clarify otherwise) will say that your RAM is running at double that rate i.e. 839.4 MHz.
What's my point? So using the more common language/definition you've actually OCed your RAM by 39.4 MHz.