Voltage seems high

[uuashington]

Hello,

 

I just got a new 9900k and am testing it out of course but something seems odd. In the settings guide that Gigabyte has (my motherboard is the Z390 Aorus Master), they say that the voltage to get an all core 5 GHz should be 1.35V or lower for most chips but when set to auto voltage, mine is drawing 1.4 or more at steady state (spiked to 1.464 during a stress test) to maintain the frequency with MCE on. If I manually set the voltage lower, the system crashes almost immediately. Did I just lose the lottery or something?

[Mister Woof]

Don't use automatic voltage settings.

 

Set fixed vcore or an acceptable offset

[uuashington]

Just now, Plutosaurus said:

Don't use automatic voltage settings.

 

Set fixed vcore or an acceptable offset

Was editing my post when I got your reply because I left this out, oops. I tried setting a lower fixed voltage but the system crashes almost immediately with a blue screen or just does not boot.

[Mister Woof]

Just now, uuashington said:

Was editing my post when I got your reply because I left this out, oops. I tried setting a lower fixed voltage but the system crashes almost immediately with a blue screen or just does not boot.

 

 

LLC?

[uuashington]

Sorry, not sure what you mean. It's been a while since I have worried about this stuff since I dialed in my previous cpu (3570k) 6+ years ago

[Mister Woof]

Load line calibration

 

Ser your vcore to a desirable target and apply a modest LLC setting to help reduce vdroop and try again

[uuashington]

22 minutes ago, Plutosaurus said:

Load line calibration

 

Ser your vcore to a desirable target and apply a modest LLC setting to help reduce vdroop and try again

I just tried 1.35V with a "medium" llc setting at it blue screened as soon as I started a stress test (within a second). Is there any problem with going with a higher setting?

[Mister Woof]

Just now, uuashington said:

I just tried 1.35V with a "medium" llc setting at it blue screened as soon as I started a stress test (within a second). Is there any problem with going with a higher setting?

I'd personally go as high as one step below maximum, but that said it introduces a voltage variance.

 

When your system goes under load, voltage will drop below the voltage target. If it's not enough to maintain stability, it will crash. LLC is in the motherboard bios and it tries to "guess" how much additional voltage is needed to compensate for the droop. As a result, it can boost higher than your target momentarily. If it's too aggressive, it can vboost pretty high.

 

Ultimately you would be better off with a higher fixed voltage value and less aggressive LLC, but it's up to you.

 

There's some other things you can change too, such as disabling vt-i and c-states, and disabling the iGPU. They help a bit with OC.

 

There's other settings that are a bit more nuanced but those are the basics.

 

It's also possible you just can't get that frequency without the extra voltage. In that case, you need to determine if higher voltage and possible lifespan reduction is worth the frequency.

[badreg]

On Gigaboard Z390 boards, LLC needs to be set to Turbo to avoid vdroop.

[uuashington]

On 8/16/2019 at 9:48 PM, Plutosaurus said:

I'd personally go as high as one step below maximum, but that said it introduces a voltage variance.

 

When your system goes under load, voltage will drop below the voltage target. If it's not enough to maintain stability, it will crash. LLC is in the motherboard bios and it tries to "guess" how much additional voltage is needed to compensate for the droop. As a result, it can boost higher than your target momentarily. If it's too aggressive, it can vboost pretty high.

 

Ultimately you would be better off with a higher fixed voltage value and less aggressive LLC, but it's up to you.

 

There's some other things you can change too, such as disabling vt-i and c-states, and disabling the iGPU. They help a bit with OC.

 

There's other settings that are a bit more nuanced but those are the basics.

 

It's also possible you just can't get that frequency without the extra voltage. In that case, you need to determine if higher voltage and possible lifespan reduction is worth the frequency.

Thanks for the explanation! I’m still running into some stability issues but at least have a better idea of what is going on now