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Hawaii Bios Editing ( 290 / 290X / 295X2 / 390 / 390X ) - Page 305

post #3041 of 3857
Quote:
Originally Posted by gupsterg View Post

@MihaStar

If we have load line slope registers in IR3567B, what use are they?
Well, loadline itself is definitely a useful thing, but when we speak about normal operation. In OC mode it won't let us achieve the highest clock under serious load (like FurMark) as the GPU will be "undervolted" and produce aftifacts.

I think there might be some profit to decrease the slope, but don't switch it off at all.This might shorten the distance in volts between light load VCC and full load VCC, giving some efficiency improvements at light loads.

So, why not... smile.gif

Truly speaking, there might be some more increase in efficiency, especially at full load, if we discover the register responsible for VARIABLE GATE DRIVE (VGD) control (see p.40 in 3565B datasheet for understanding).

In short, the Gate-Source voltage on FETs in VCC core power block is variable as it's being produced using a dedicated small DC-DC circuit on the TOP of the card (MBA reference board, the RefDes are Q501-L501-C500,501,502,503), to the north from the 3567B IC. In fact the voltage level is ~7V and I didn't notice it changes during operation, but if we increase the value, we could reduce the conductive losses and heat generation (especially in the lower FET, and especially at high load and OC).
post #3042 of 3857
Thread Starter 
+ rep smile.gif and thank you smile.gif .

As OVP & OCP is per loop, do you think half byte represent each loop?
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The Stilt Machine
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post #3043 of 3857
Thanks for the reply. So how useful is editing the VRM options in the Hawaii bios editor?
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post #3044 of 3857
Quote:
Originally Posted by spyshagg View Post

The 16.7.2 driver makes my modded 290x unstable at the usual overclocking settings i use. Driver crash error pop-up on windows.

But it is 100% stable with 16.6.2 and every driver before it.

Same thing happened to me. Used to be at 1150/1500, now I'm at 1100/1400 and anything over 1100mhz will result in black screen or corruption, no matter what voltage I set.
post #3045 of 3857
Quote:
Originally Posted by PRSCU24 View Post

Same thing happened to me. Used to be at 1150/1500, now I'm at 1100/1400 and anything over 1100mhz will result in black screen or corruption, no matter what voltage I set.
Have similar negative feedback. I've been OC-ing the RAM and checking the FPS increase. After switching from 16.3.2 to 16.7.2-beta lost about 15-20fps in Kombustor (from ~150fps down to 130-135) and about 10-12fps in Furmark (from 142 to about 130) with the same HW settings.
The 3DMark result remained unchanged. The core is not overclocked, 1000-1050MHz, so didn't notice anything.
Going to try the WHQL release 16.7.2, but it seems nothing will change...

It looks like AMD is trying to push their RX480 the same way as "the green" company sometimes does biggrin.gif
Hope I'm mistaken...

p.s. Tried 16.7.2 WHQL (reports as 16.7.3). Caught a BSOD during first installation, the second time it passed... wth.gif
Happy to report the performance loss hasn't been observed, Kombustor & FurMark results are the same compared to 16.3.2 driver. OC level also remained unchanged at 1050/1550, with the same voltages, stable as usual...
Edited by MihaStar - 7/22/16 at 2:29am
post #3046 of 3857
sure hope not. But the difference between 16.6 and 16.7.2 is abysmal for my overclock. If it could handle it before it should handle it always.
post #3047 of 3857
I wanna increase the voltage underclocking range on my r9 290, atm maximum is -100v. What do i have to modify, can anyone help me ?
post #3048 of 3857
Quote:
Originally Posted by PRSCU24 View Post

Same thing happened to me. Used to be at 1150/1500, now I'm at 1100/1400 and anything over 1100mhz will result in black screen or corruption, no matter what voltage I set.


Does the underclocked memory benefit you somehow?
post #3049 of 3857
Quote:
Originally Posted by spyshagg View Post

The 16.7.2 driver makes my modded 290x unstable at the usual overclocking settings i use. Driver crash error pop-up on windows.

But it is 100% stable with 16.6.2 and every driver before it.

No problem for me, even with your BIOS. Weird...

[EDIT] core is only OC'ed to 1100Mhz though.
post #3050 of 3857
Quote:
Originally Posted by spyshagg View Post

sure hope not. But the difference between 16.6 and 16.7.2 is abysmal for my overclock. If it could handle it before it should handle it always.
Certainly, the OC level shouldn't decrease.
I tried 16.7.2 WHQL (16.7.3 in fact) and it performed better than 16.7.2. beta, the way like 16.3.2 performed, my OC is remained stable at 1050/1550 with the same voltages.
The only thing is BSOD during first installation... But the second time it passed. Don't know why.
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