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Fiji Bios Editing ( Fury / Fury X / Nano / Radeon Pro Duo ) - Page 157

post #1561 of 1634
Modded the BIOS and removed the VDDC offset. DPM7 VID is now reading 1.218v.

Edit: Pretty sure the VRM is hitting it's thermal throttle point in OCCT. OCCT is insanely demanding...10-20% more current than FurMark and nearly double the current draw of Firestrike at the same clocks/volts.

Edit2: At 1000MHz GPU DPM7 is 1218mv as above, but with 1053MHz set in BIOS it's 1250.
Edited by Blameless - 4/6/17 at 2:37am
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post #1562 of 1634
Well something is causing some sort of throttle / negative scaling. For a set voltage of 1250vid (1250 vid gives me as low as 1175-1200 underload.) + 36mv, gives me varying voltage of anything from 1212mv-1256mv it goes up and down a lot, and a set clock of 1135, as thermals increase so performance drops. But as the thermals are increasing VOLTAGE is not according to software. So it has to be something related to thermals. Thermals are the only thing that fits the profile.
Edited by Alastair - 4/6/17 at 2:31am
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post #1563 of 1634
Thread Starter 
Quote:
Originally Posted by Blameless View Post

Modded the BIOS and removed the VDDC offset. DPM7 VID is now reading 1.218v.

Edit: Pretty sure the VRM is hitting it's thermal throttle point in OCCT. OCCT is insanely demanding...10-20% more current than FurMark and nearly double the current draw of Firestrike at the same clocks/volts.

What does HWiNFO show for VRM temps?

I can mod OCP/OVP/OTP, etc if you want it done.

Once as a member in the owners thread thought HWiNFO showed "whacko" VRM temp. I got some readings via a probe mounted on back of Fury X PCB and they were within +/- 1°C of each other.
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post #1564 of 1634
Quote:
Originally Posted by Alastair View Post

Well something is causing some sort of throttle / negative scaling. For a set voltage of 1250vid (1250 vid gives me as low as 1175-1200 underload.) + 36mv, gives me varying voltage of anything from 1212mv-1256mv it goes up and down a lot, and a set clock of 1135, as thermals increase so performance drops. But as the thermals are increasing VOLTAGE is not according to software. So it has to be something related to thermals. Thermals are the only thing that fits the profile.

Higher temperature also increases current draw.
Quote:
Originally Posted by gupsterg View Post

What does HWiNFO show for VRM temps?

I just updated HWinfo, checking VRM temps now.

VRM DDC temperature is reaching ~90C in Furmark and over 100C in OCCT, with a fan profile that keeps the GPU at 70C (so 75-100% fan speed in these tests), at 1.25 VID with 1053 core and 500 memory.
Edited by Blameless - 4/6/17 at 2:49am
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post #1565 of 1634
Also, I've been playing around with the memory voltage and I think I may be on to something.

The lower I go on memory voltage, the harder it is for me to hit negative scaling and the higher the memory bandwidth results are in AIDA64.

Could be the HBM overheating and throwing EDC errors?
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post #1566 of 1634
Quote:
Originally Posted by Blameless View Post

Also, I've been playing around with the memory voltage and I think I may be on to something.

The lower I go on memory voltage, the harder it is for me to hit negative scaling and the higher the memory bandwidth results are in AIDA64.

Could be the HBM overheating and throwing EDC errors?
For those of us on custom loops I don't see how are HBM is overheating?
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post #1567 of 1634
Quote:
Originally Posted by Alastair View Post

For those of us on custom loops I don't see how are HBM is overheating?

It's almost certainly not.

Anyway, I'm down to 1.2v on the HBM now (which is actually SK Hynix's specified voltage for 500MHz...AMD is overvolting the stacks). Memory bandwidth stopped improving at 1.25v, but it's still stable at 1.2v and I'm seeing the least negative scaling/throttling I've seen. Only OCCT seems affected at any reasonable settings for the stock Fury Nitro cooler.
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post #1568 of 1634
Ok, this is what I've done so far, starting with the newest Sapphire Fury Nitro OC+ firmware (second/blue switch position):

- Changed the +37.5mv VDDC offset to a -100mV MVDDC offset (by changing 8D000600 to 8e00F000) in a hex editor. This was the only thing I altered outside of Fiji BIOS editor.

- Set DPM7 to 1107MHz at 1263mV
- Target GPU temperature 80C -> 75C
- Fan speed granularity 4836 -> 9672
- TCD limit 300A -> 330A
- MPDL 300w -> 375w

I also increase the power limit slider in Wattman to +50%, which is the extent of software involvement in the OC. Not even using a custom fan curve.

Card now appears to be stable without signs of throttling or missing performance, at these clocks and voltages, in everything except OCCT. Even Furmark will run without throttling, though it does get extremely hot (75C core, 105C VRM). This is more than 100MHz better than what I was getting before, with pure software OC, despite stock being 1050MHz. Fans are near silent in games and most benchmarks, but ramp up to 95-100% in Furmark.

I'm pretty hopeful for 1150+ game stable as I still have some voltage, current, and temperature headroom, under such loads.

Edit: hitting a voltage wall around ~1100MHz and keep finding something that will eventually cause the the driver to error out, especially if I use VCE/ReLive in conjunction with various tests/games.
Edited by Blameless - 4/6/17 at 10:18pm
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post #1569 of 1634
Upon further testing, this sample isn't even completely stable at stock while recording with ReLive. It also vibrates like crazy at certain fan settings (~65%, not higher or lower).

Looks like it's going back.
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post #1570 of 1634
I also get some vibration around 62-65% FAN speed
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