Hi there just completed my first ever build yesterday. I've tried my first overclock this morning and everything seems stable enough but there is a weird noise like a hissing/whistle coming from somewhere in the system whenever I stress test. My specs are: i5 750 @ 3.8Ghz core voltage about 1.4v bus speed 200 multiplyer 19 Gigabyte P55 UD5 Noctua NH-U12P-SE2 4Gb G.Skill Ripjaw DDR3 1600Mhz @ 1600Mhz CL8 using XMP Nvidia 9800GT Temps seem ok: Core 0 @ 82 degrees Core 1 @ 82 degrees Core 2 @ 75 degrees Core 3 @ 79 degrees What could the noise be? It better not be the CPU melting!!! Could it be that the motherboard capacitors are getting overloaded??? Any help chaps will be grately appreciated. Cheers.