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post #7391 of 7919 (permalink) Old 03-12-2019, 04:21 AM
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Quote: Originally Posted by Alastair View Post
Set power limit to 50% then start undervolting from there.
Maximizing the power limit won't be a problem, will it?
I'll try to get P6 and P7 values below 1000 Mv. To reduce heating. I guess under 1000 Mv it won't be a problem.

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post #7392 of 7919 (permalink) Old 03-12-2019, 05:05 AM
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Quote: Originally Posted by candasulas View Post
Maximizing the power limit won't be a problem, will it?
I'll try to get P6 and P7 values below 1000 Mv. To reduce heating. I guess under 1000 Mv it won't be a problem.
Not as I understand it. As your card will be allowed to draw more power for a given voltage. Meaning you could lower volts a bit more before reaching instability as the card has more room to draw more power to compensate for the dropping volts. Most of the undervolt OC's I have seen in this thread have been with +50% power limits.

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post #7393 of 7919 (permalink) Old 03-12-2019, 05:18 AM
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Quote: Originally Posted by Alastair View Post
Not as I understand it. As your card will be allowed to draw more power for a given wattage. Meaning you could lower volts a bit more before reaching instability as the card has more room to draw more power to compensate for the dropping volts. Most of the undervolt OC's I have seen in this thread have been with +50% power limits.
I understand. In order for the card to go down to lower Mv values, the power drawn from the PSU needs to be increased. I'm sharing a screenshot of the user who is doing Undervoltage on another site. Will you take a look? The power limit here is 20%. But P7, P6 is low. However, the system is stable.

Asus Strix Vega 64. The card is the same as my own card. But when I set these values, the system crashes.
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post #7394 of 7919 (permalink) Old 03-12-2019, 05:37 AM
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Quote: Originally Posted by candasulas View Post
I understand. In order for the card to go down to lower Mv values, the power drawn from the PSU needs to be increased. I'm sharing a screenshot of the user who is doing Undervoltage on another site. Will you take a look? The power limit here is 20%. But P7, P6 is low. However, the system is stable.

Asus Strix Vega 64. The card is the same as my own card. But when I set these values, the system crashes.
that's the goal here yes. However I have never used Vega before so I am merely going by what other users have posted. My vega is still waiting for a water block before I can play with it.

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post #7395 of 7919 (permalink) Old 03-12-2019, 05:45 AM
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Quote: Originally Posted by Alastair View Post
that's the goal here yes. However I have never used Vega before so I am merely going by what other users have posted. My vega is still waiting for a water block before I can play with it.
What happens if we pull the voltages down without a power limit?
In some forums they say the power limit will damage the card.

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post #7396 of 7919 (permalink) Old 03-12-2019, 06:44 AM
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1. Lower sustained GPU clocks.
2. No such thing as card being damaged from adding +50% power limit.



Also remember about the silicon lottery.

Say card #1 can undervolt P7 1650MHZ to 1.00mv, card #2 might only be able to do 1650mhz at 1.19mv.

It's not an exact science and you need to run tests to make sure everything is stable.

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post #7397 of 7919 (permalink) Old 03-12-2019, 07:16 AM
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Quote: Originally Posted by candasulas View Post
What happens if we pull the voltages down without a power limit?
In some forums they say the power limit will damage the card.
Voltages down without increasing power limit means your cards would not be able to hit the same sustained clocks as a card thay is free to pull more power.

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post #7398 of 7919 (permalink) Old 03-12-2019, 07:39 AM
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Quote: Originally Posted by Alastair View Post
Voltages down without increasing power limit means your cards would not be able to hit the same sustained clocks as a card thay is free to pull more power.
I'il write you step by step,
1. I will the power limit + 50%.
2. I will drop P6 and P7 values.
3. The HBM memory value will be less than or equal to P6.
4. I will stop P6 and P7 when the frequency starts to drop.
5. I will gradually reduce the power limit to the point where it does not affect the frequency.

The process is basically going to be that way, right?
 

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post #7399 of 7919 (permalink) Old 03-12-2019, 07:39 AM
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Quote: Originally Posted by sinnedone View Post
1. Lower sustained GPU clocks.
2. No such thing as card being damaged from adding +50% power limit.



Also remember about the silicon lottery.

Say card #1 can undervolt P7 1650MHZ to 1.00mv, card #2 might only be able to do 1650mhz at 1.19mv.

It's not an exact science and you need to run tests to make sure everything is stable.

I'il write you step by step,
1. I will the power limit + 50%.
2. I will drop P6 and P7 values.
3. The HBM memory value will be less than or equal to P6.
4. I will stop P6 and P7 when the frequency starts to drop.
5. I will gradually reduce the power limit to the point where it does not affect the frequency.

The process is basically going to be that way, right?

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post #7400 of 7919 (permalink) Old 03-12-2019, 09:53 AM
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Quote: Originally Posted by candasulas View Post
I'il write you step by step,
1. I will the power limit + 50%.
2. I will drop P6 and P7 values.
3. The HBM memory value will be less than or equal to P6.
4. I will stop P6 and P7 when the frequency starts to drop.
5. I will gradually reduce the power limit to the point where it does not affect the frequency.

The process is basically going to be that way, right?
Why do you insist on lowering the power limit? Unless your PSU is insufficient, there's no other reason to do that IMO. +50% power limit just means that the card won't throttle due to power limitations that easily. It won't draw more power than spec, it won't overvolt, it won't do anything other than tell the card "Hey, just draw as much as you need". If we were talking about registry edits that would allow for +100% power limit, that's another story, but +50% is safe.

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