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Fiji Bios Editing ( Fury / Fury X / Nano / Radeon Pro Duo ) - Page 103

post #1021 of 1773
@gupsterg Could these cards be similar to the 480 in that they need a higher power level to utilize the increase in voltage? I.e. with my 480 I needed 165% to get 1175mv and higher to work without negative scaling.
post #1022 of 1773
Thread Starter 
No not an issue wink.gif . You see we can up the default PL in ROM which OS driver uses for 0%, allowing higher PL when adding via OS. For example The Stilt placed 400W in ROM so once in OS using +50% equals 600W.

I know the PowerTune section is active/being ref'd by driver in ROM due to if I lower PL in ROM and do nothing in OS I see throttling.

We need someone who can view driver to confirm if that is restricting us.
Edited by gupsterg - 7/31/16 at 11:18am
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post #1023 of 1773
I noticed that with my nano I get better performance @ 1000mhz with a -48mv than I do at 1050 with +28mv no matter the power level.
post #1024 of 1773
Thread Starter 
You are experiencing negative performance scaling with voltage increase frown.gif .

From a) the cards I've had b) viewing others data the point at which it occurs (ie voltage offset) depends upon each card. I also think the severity of decrease is also GPU dependent. So some "characteristic" of GPU reflects how well it will scale with voltage increase.

Totally perplexing frown.gif .
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post #1025 of 1773
Quote:
Originally Posted by gupsterg View Post

@subscribers

Via PM I had been discussing negative performance scaling with increased voltage on Fiji with The Stilt. He gave me 2 ROMs to test, I will share the results of 1st test ROM.

gupfury1.bin results (Click to show)


gupfury2.bin besides CAC records modification had another mod by The Stilt, as this did not perform any better and all the testing results were the same as above except for +/- run to run variance I won't post those.

All in all the conclusion is something within the driver is limiting card to use extra voltage / power. We already know there is a >1300mV limit to GPU core voltage within driver stopping us using a ROM where it is modified as such in PowerPlay VID. There was also discussion which concluded OCP, OTP, etc limits within voltage control chip are not the issue either.

What perplexes me is when we have negative performance scaling with increased voltage on Fiji there are no signs of throttling to GPU clock like say how we see when PowerLimit is too low for clocks.

All in all I thank @The Stilt for his time, appreciate as always his insight and willingness to help the community thumb.gif .

Thank you Gupsterg and The Stilt for all this and the share.

REP:+1
Edited by bluezone - 7/31/16 at 2:10pm
post #1026 of 1773
@gupsterg the overclocking/undervolting on these cards are totally different than cards I've had in the past. What would make sense with most cards (bump in voltage/power level = performance increase, sweet spots of course) are the complete opposite in my Nano's case. So far my best performance has come at 1000mhz/-57mv - 535mhz memory with max power level.
post #1027 of 1773
Quote:
Originally Posted by Ne01 OnnA View Post

ASIC is 65.8 - 68.6 (i have different now after BIOS Flashing (UnderVolt + OC) but seriusly This Monster of GPU don't need any OC (besides for Benchies ;-))

Wait, are you saying ASIC changed after unlock?
post #1028 of 1773
Thread Starter 
@comagnum

I totally agree Fiji OC'ing is bewilderingly different than anything else I've had.

Out of the cards I owned, I found the ones with low DPM 7 VID scaled more for me, they also allowed larger voltage offset before negative scaling occurred.

On stock ROM / settings what are the VIDs per DPM for your card?
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The Stilt Machine
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XPS - i5 4690K
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Samsung Evo 840 ThermalRight Archon IB-E X2 + 2x TY143 ThermalRight TY-143 2x front case intake Arctic Cooling F12 + 2x F9 as rear case exhaust 
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post #1029 of 1773
I'm somewhat similar - this Nano of mine can hold 1000mhz at a cool 1.125v under Valley 4K load - but it can't stick 1025mhz under 1.2v. The difference is a whopping 20 degrees increase on the VRMs and a 12 degree increase on the core.

The conclusion I've come to is the Nano's cooler is excellent for what it is - but as soon as you pass about 180w draw the thing seriously struggles even with supplementary fans blowing on the back of it and it running at 100%.
post #1030 of 1773
Quote:
Originally Posted by gupsterg View Post


We need someone who can view driver to confirm if that is restricting us.

I know it's another site but have you queried asder00?

http://forums.guru3d.com/showthread.php?t=399498

http://forums.guru3d.com/member.php?u=218722

I've never talked to him, but he seems to know drivers.
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