"A: Throttling is the ability of the CPU to change between stop (idle), and full speed modes, at very high frequency (hundreds of kilohertz). This CPU switching looks (to the system) as a decrease in the working frequency of CPU, and leads to lower power consumption." click here
Case fan is in the right way round?
The CPU temp is "ok" if anything a little high but still it is "ok". Try moving the case out...Also make sure the cables inside are not against a fan etc blocking the flow of air.
Mainboard not sure on the temps of boards but mine is 28C...Again could be to the fans oreintation.