Most AMD boards seem to have an idle problem. With your computer throttling down to 1400mhz, and under no load, its pretty safe to assume your temperatures will be relatively close to ambient actually (26-30c). The reasons your temps are "spiking" is because its beginning to get under load and is starting to read.
Run intel burn test a few times and watch your temps.
edit: yeah watching my temps, its going down to the 23c and jumping to 33c, then falling back down, etc. I have a pretty beefy overclock as well.