Originally Posted by
Slovnaft
First off, 1.26 is a pretty low vNB especially for FSB speeds 450+. When pushing high OCs on this chip I get stable around 1.4-1.6vNB depending on the board and chipset.
Second, what's the highest you've ever had your vcore? Instability at varying settings could be a sign that you've fried your chip. Try booting at stock everything. If you can't, try seating it on a different board if you have that option. If it won't post on another board then you've probably killed your chip, but don't worry, intel will RMA it as long as you throw a bunch of technical terms at their RMA support.