Using Offset VCore = No boot, no post. Error code 79

[samrx]

Hey guys,
Have a strange issue here, and am hoping someone could shed some light on the problem.

Whenever I try to use offset vcore of any amount, my computer won't post or boot. It will just stay on 'no signal', and keep trying to reboot itself, until eventually the computer will just turn off. The last code I see before it shuts off is code 79. The only way to get the computer to boot again is to reset cmos.

On manual vcore it works great, boots fine, only require 1.36v, on auto offset it gives me 1.43. So logically I tried -0.05 offset. Had the possibility that idle volts was not enough, so I've tried making small increments to the offset, ie. -0.005 and +0.005 up to -0.05 and +0.05 and it causes the same result, no boot. The only way to get offset to boot is to use auto, but then there isn't much point to that.

I've tried turning off C-states, I've tried leaving LLC and other voltage settings on default. I've even tried resetting cmos, then touching nothing except the vcore offset voltage and it'll still not boot.

Any insight or solutions would be great

[samrx]

No insights?

[HiVizMan]

Not sure how I missed your thread this morning.

You should be able to set your offset against a value as you correctly say. All I can suggest is that you swap to the B bios and see if the problem is the same there. What bios are you trying?

[samrx]

Hi,
Thanks for the reply. I am currently on the 1202 bios. Is it easier to test bios B or to flash to a bios which is known to not have this problem?
Secondly which bios version does bios B actually use?

It's strange how the smallest offset, whether + or - can cause the system not to boot..

Thanks

[HiVizMan]

I would think that BIOS B has the bios version your motherboard shipped with.

If you have not flashed your A bios yet then they will be the same.

[samrx]

No luck with bios B, which was bios revision 1005.. any amount of offset causes system not to boot :/

[HiVizMan]

1005 was and is for me the BIOS of choice on that board still.

Can you take both your board and the CPU in to be tested some place. I would like to nail this one down. Is it the CPU that is a little flakey or the motherboard. Maybe if you have a mate with the same X79 platform you could swap CPU's to check?

[samrx]

Hi,
I've made some progress. I flashed to bios 0018, and now using offset works! As in, I can now boot into bios after a restart without a black screen.

However, the instant I adjust BCLK from 100 to say 125, the problem persists.

So is it that you can't use offset vcore for bclks higher than a certain figure?

Thanks!

[Eyetrip]

What happens when you use bclk straps, is that offset no longer works as it normally does - this is my experience with 3820/3930K, and on boards Gigabyte UD/Asus Formula IV

It does something like set the start voltage to 1V. You need to offset from 1V when using bclk straps, so to get 1.3V you would need to offset 0.3V

Using bclk straps also prevents the CPU from being able to drop voltage at idle. This is exactly why I don't use it and stick to multiplier OCing.

If you are using 3930K/3960X, either stick to using multiplier OC, or use manual voltage.

[samrx]

What happens when you use bclk straps, is that offset no longer works as it normally does - this is my experience with 3820/3930K, and on boards Gigabyte UD/Asus Formula IV

It does something like set the start voltage to 1V. You need to offset from 1V when using bclk straps, so to get 1.3V you would need to offset 0.3V

Using bclk straps also prevents the CPU from being able to drop voltage at idle. This is exactly why I don't use it and stick to multiplier OCing.

If you are using 3930K/3960X, either stick to using multiplier OC, or use manual voltage.

Ahh cheers for the clarification. Unfortunately I have a 3820, and thus multiplier OC's don't cut it haha.

So if I were to attempt to use offset vcore, you're saying if I have an offset of +0.3V it would be more likely to boot? But then again you're saying that would be pointless, because it won't drop voltage along with the clock speed, and thus essentially it is the same as setting a manual voltage?

Thanks!