d1am0nd

I have boot problems with ASRock Z68 Extreme4 Gen3. Well first my CPU (2500K) is stable at 48x. multiplier and 1.4v. Vcore, it is stable also at the 49-th multiplier but with a little bit higher Vcore voltage. (around 1.43v.), but when i tried to put 50x. it doesn't wont to boot and, debug stuck at 0x70 (the voltage was 1.5). Then i put 1.55v. for 5ghz, and the same debug code. I tried even with 1.6v. and failure again, it stuck at 0x70 debug code. Internal PLL overvoltage is on. Did i got the CPU multiplier wall ? The BIOS is 1.10, but it has no difference with the older 1.00.