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[Official] AMD R9 390/390X Owners Club - Page 662

post #6611 of 11956
Quote:
Originally Posted by jdorje View Post

In fairness, OneB1t's editor is fairly new. Before that it was all hex editing, which is still afaik the easiest way to edit memory timings which are the most important bios mod. Additionally, some things in the bios must match up - like the voltages in all six tables, or the clocks on the tables and the master list.



If i raise those values, do you think I'll have high enough headroom for a 1200mhz + OC?
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post #6612 of 11956
Quote:
Originally Posted by m70b1jr View Post



If i raise those values, do you think I'll have high enough headroom for a 1200mhz + OC?

It doesn't matter leaving those values at stock. The +50% power limit can allow you to go further.

It will take a hefty number of tests to get this dialed in and see the effect.
post #6613 of 11956
Do you have coil whine on your 390s? my XFX 390 B.E. has coil whine (not too much).
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post #6614 of 11956
DO NOT RAISE THOSE VALUES.

I may have seriously misled you since I forgot I already raised them (default is 208). I'll go lower them all in the morning. Raising the power limit beyond the 300 ish that the 8+6 pins can provide is one of the few ways to damage your card. And since you can add +50% in software that 238 can go up to around 360w draw already. The 238 is copied from sapphires bios but they have 8+8.

Personally I found no benefit to raising the power limit anyway.

And finally that has no effect on stability. It just throttles if you exceed the limit.

To see how much voltage you need for 1200 mhz go find out how much you need for lower clock. Put it in a spreadsheet and chart it - clock on the horizontal voltage on the vertical. Then add a quadratic fit curve. It should be very accurate.
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post #6615 of 11956
QUADRATIC WHUT?
post #6616 of 11956
Quote:
Originally Posted by jdorje View Post

DO NOT RAISE THOSE VALUES.

I may have seriously misled you since I forgot I already raised them (default is 208). I'll go lower them all in the morning. Raising the power limit beyond the 300 ish that the 8+6 pins can provide is one of the few ways to damage your card. And since you can add +50% in software that 238 can go up to around 360w draw already. The 238 is copied from sapphires bios but they have 8+8.

Personally I found no benefit to raising the power limit anyway.

And finally that has no effect on stability. It just throttles if you exceed the limit.

To see how much voltage you need for 1200 mhz go find out how much you need for lower clock. Put it in a spreadsheet and chart it - clock on the horizontal voltage on the vertical. Then add a quadratic fit curve. It should be very accurate.
Firstly, it's not going to damage the card. Worst case scenario your card will power starving.

Secondly, 8+6 pin can deliver more than 300W.

Thirdly, Hawaii/Grenada BIOS have voltage limit + vdroop. Voltage limit pretty low last time I checked. So no problem here.

Fourthly, voltage can kill this card provided you're using BIOS without voltage limit like PT1/PT3.
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post #6617 of 11956
Quote:
Originally Posted by mus1mus View Post

QUADRATIC WHUT?

It means fitting with x^2 kind of polynomial. Or in simpler terms "thats whats written on the tickbox!" - you will get some kind of extrapolated curve - following it should give you roughly the volts needed.
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post #6618 of 11956
Quote:
Originally Posted by jdorje View Post

DO NOT RAISE THOSE VALUES.

I may have seriously misled you since I forgot I already raised them (default is 208). I'll go lower them all in the morning. Raising the power limit beyond the 300 ish that the 8+6 pins can provide is one of the few ways to damage your card. And since you can add +50% in software that 238 can go up to around 360w draw already. The 238 is copied from sapphires bios but they have 8+8.

Personally I found no benefit to raising the power limit anyway.

And finally that has no effect on stability. It just throttles if you exceed the limit.

To see how much voltage you need for 1200 mhz go find out how much you need for lower clock. Put it in a spreadsheet and chart it - clock on the horizontal voltage on the vertical. Then add a quadratic fit curve. It should be very accurate.

About 80 watts from the PCIe lane, 150ish from the 6 pin and 175 from the 8 pin. You could push over 400 watts if you wanted to.
post #6619 of 11956
Quote:
Originally Posted by Carniflex View Post

It means fitting with x^2 kind of polynomial. Or in simpler terms "thats whats written on the tickbox!" - you will get some kind of extrapolated curve - following it should give you roughly the volts needed.

No pun intended. I know a bit of Math smile.gif

You said it better than the one who mentioned it tho, it's only true up to a certain point. So it's not a certainty. Overclocking is not a guaranteed figure. People need to steer clear of that.
post #6620 of 11956
Thread Starter 
I'm finding more and more, that's it's only worth running my card around 1150mhz with low voltage.

My nephews came over and played GTA V with my son for about 5 hours Friday night and that joker was cooking at 81C with 73c VRM by the end of the whole thing.....

Benching is a different story, but actual 4K gaming (which sends the core temps up a whole 5C over 1080P gaming) is just too much to overvolt on air.

I'm happy with the card none the less though, but I don't think crossfire will be in the cards now. There's no way the top card will stay cool enough with another one underneath it. mad.gif
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