Asrock P67 Extreme4 UEFI & Drivers thread [Extreme6 & Pro3 owners welcome]

[Falkentyne]

Nope, that's not correct.
There are many reports of this MB posting to black screen or black screen with flashing cursor when OC is too high. The system will automatically reboot, which allows me to simply go back into BIOS and readjust to enter Windows again.

My CPU is listed as "D2" stepping in CPUZ. My BIOS is not corrupt (I have reflashed just in case). PLL Overvoltage is enabled.
BTW: Currently retesting @ wimpy 44x multi; stable so far on Prime95 blend...

Blacksun:
This is EXACTLY what happens on my gigabyte board when the OC is too high with PLL overvolt disabled.

System hangs on black screen with a flashing cursor at the top left, or just immediately reboots and says "OC failed (without a black screen).

What you described is exactly what happens if PLL Overvoltage is disabled, when you pass the chip's multiplier wall. Unless you need it enabled for 4.5 ghz already (but in that case, you would need it enabled just to pass 4.2 ghz, if the CPU's absolute wall were 4.5 ghz).

If you can boot up at 4.5 ghz and 4.6 ghz gives you a hard complete wall, even with 1.5v vcore, 1.1 VTT, etc, then PLL Overvoltage is not working.

Can you actually verify that PLL overvoltage is working?
If you disable PLL Overvoltage at 4.5 ghz, you can boot into windows, right?

But at 4.6 ghz you get a hard wall...that means there's a bug with PLL Overvoltage....
Or you could just have the worst CPU in the world that won't work at all even with PLL Overvoltage....
(I've only seen D1 steppings that do that).

(Ket please correct me if I'm wrong).

[Falkentyne]

@Ket:
What does increasing the system agent vccsa voltage do? I thought it's best to leave it at the default....