If you are using a Dell Studio 1555, you might want to update your BIOS to A11. However, if your laptop comes with the A09 BIOS, you will be disappointed. You will not be able to update your BIOS from A09 to A11.
When you do get on to Dell, they will advise you to reinstall your operating system or to do a system restore. Trust me guys, it will not work. The laptop BIOS will remain at A09 irrespective of whether you have restored your laptop's OS. What you need to do is actually to make a call to Dell and ask them to send a Dell engineer to replace your laptop's motherboard. It could be done but you need to ask them to do so.
Update: 01/06/2010 - The solution is quite simple though. Call Dell and ask them for a motherboard replacement. I did it and the Bios on the new motherboard is A08. So far so good as in no overheating of the CPU or GPU at the moment.