Check your sockets or this could happen to your precious Core-i5 and P55.
Initial reports says that this only happens with extreme overclocking.
But better be informed than sorry.
Read the following links for more details;
AnandTech: P55 Extreme Overclockers: Check your sockets!
The Perils Of Overclocking - Review Tom's Hardware : P55 On A Budget: Five Core i5/i7 Motherboards For $100-$150