Think of it like this. CPUs are so complex now, its rare or impossible for them to work out ALL of the bugs before they go into production. Therefore, to stay competitive in time to market and keep costs down, they added a way to reprogram the CPU. The entire process is kept well under wraps to prevent CPU viruses from being written and distributed. Basically only the BIOS has the authority to load the micro-code (reprogram the CPU) and the micro-code comes only as black box code from the manufacturer (so even the BIOS doesn't know whats really going on). So - to make the answer short, you need a new BIOS version which would have in it a new micro-code if indeed there is one to fix your problem.
