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post #1 of 11 (permalink) Old 11-03-2019, 11:18 PM - Thread Starter
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RX580 Bios mod help

So I have this card

https://www.sapphiretech.com/en/cons...o-rx-580-8g-g5

but want to run it at these specs

https://www.sapphiretech.com/en/cons...580-8g-g5-le_c

at the lowest possible voltage. I want to do it permanently in the bios rather than use software.

Can anyone on this forum put up the bios file here that I can just flash?

Thanks.

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post #2 of 11 (permalink) Old 11-04-2019, 12:03 AM
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If you mind uploading your original BIOS file from GPUz, I'd be happy to take a look at it for you, see what I can do. Note: If I send you a BIOS file, I hold no responsibility if the BIOS fails for whatever reason lol. I've only modded the BIOS on my own cards. I don't see how a Sapphire would be any different than a Gigabyte or Asus other than the code used in the BIOS to mark it as such brand name.

EDIT:
Also, if I'm not mistaken, with these RX cards they seem to respond more to power control (wattage used), and temperature to determine what clocks they're capable of. However if you're just wanting a factory overclocked card's specs flashed to your card, that's super easy.

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post #3 of 11 (permalink) Old 11-04-2019, 04:06 PM - Thread Starter
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Quote: Originally Posted by pioneerisloud View Post
Note: If I send you a BIOS file, I hold no responsibility if the BIOS fails for whatever reason lol.
Yes, that's for sure. This card has a bios switch on it so even if one fails I can always try to flash it back running on the other one.



Quote:
Also, if I'm not mistaken, with these RX cards they seem to respond more to power control (wattage used), and temperature to determine what clocks they're capable of. However if you're just wanting a factory overclocked card's specs flashed to your card, that's super easy.
I haven't been monitoring its clocks, so the advertised clocks are automatically exceeded when there is headroom?

In any case I'd just want it to run at 1450mhz on the lowest possible voltage. (I don't know what the voltage that Limited Edition card is set to)

Thanks.
Attached Files
File Type: zip Ellesmere.rom.zip (110.1 KB, 2 views)

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post #4 of 11 (permalink) Old 11-04-2019, 04:32 PM
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Do note:
This might break Windows 10 UEFI booting, it might not. I flashed mine with success using these same exact copies of these programs, and I'm using UEFI boot on Windows 10, HOWEVER I'm on a z68 motherboard that may or may not fully support UEFI.

With that being said, here's what I've changed in the BIOS for you so far:
Core clock - 1450 (up from 1411)
Target Temp - 65*C (down from 75*C)
Max and Small Power - 200w (up from 175w)
TDP - 175w (up from 145w)

This should allow 1450 clocks with little to no throttling, however voltage is up in the air as I have no clue what voltage your card currently runs at, or what it's capable of running with 1450 clocks. You're welcome to use the tools included in the zip file (ATI Flash and Polaris BIOS Editor) to further modify the BIOS yourself, or you can post any updates you need here and I'll be happy to help. Polaris BIOS Editor is, well, the BIOS Editor for Polaris based GPU's. And ATI Win Flash will flash whatever BIOS you have (1450.rom is included) saved onto your GPU, does require a restart.

If you want a specific voltage or power, you'll have to do some testing with your card to determine its lowest stable voltage and lowest stable power usage to get 1450 clocks. This is about the best I can do blindly for you, and it may or may not be stable (my personal RX580 can only clock to 1425 for example, but its a single 8pin Asus card).
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post #5 of 11 (permalink) Old 11-04-2019, 06:33 PM - Thread Starter
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I tried a temporary overclock in Afterburner and got through 3 passes of Heaven by changing the clock to 1450mhz and voltage to 1130mv. (AMD set the voltage of the card so power state 5 was the highest for some reason.)

Can you make another one that keeps all your changes but with a new core voltage at 1130mv?

Thanks.


Last edited by pioneerisloud; 11-04-2019 at 07:33 PM.
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post #6 of 11 (permalink) Old 11-04-2019, 07:34 PM
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Oops, I accidentally edited your post instead of a new comment. Sorry. Been editing my own posts in a benchmark thread.

Absolutely! Here you go. Hopefully it works.

If it does not, just flash back to the other one. If voltage didn't stick, then your card doesn't support BIOS voltage control. We can still tweak the power control settings, to lower the wattage used, to lower the heat output. This may or may not produce throttling though, depending on how much power your card NEEDS to draw to get to 1450 core clock.
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File Type: zip 1450v2.zip (108.1 KB, 3 views)

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post #7 of 11 (permalink) Old 11-04-2019, 08:47 PM - Thread Starter
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Afterburner shows 1125mv, was it set to 1130mv in the bios?

Also, can you reverse the target temp to 75? The fans got really loud really fast.



In addition, it did break UEFI booting. Is there a workaround?


Thanks.

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post #8 of 11 (permalink) Old 11-04-2019, 09:21 PM
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Quote: Originally Posted by Popple View Post
Afterburner shows 1125mv, was it set to 1130mv in the bios?

Also, can you reverse the target temp to 75? The fans got really loud really fast.



In addition, it did break UEFI booting. Is there a workaround?


Thanks.
Was set to 1125mv, that's the maximum voltage the BIOS editor claimed was legitimate. If I were to set any other voltage than that, the card probably wouldn't be recognized correctly would be my guess. I included the tool in the original zip upload I did, you're welcome to give it a go. It's not scary. Just open the exe as administrator (just so there's no issues with it reading the rom). Go to through the tabs up top and take a look in your BIOS. It's all pretty straight forward in there.

The things you can change are:
  • Memory Timings (don't touch unless you really REALLY know what you're doing)
  • Voltages for memory and core
  • Powertune settings (only adjust the 3 wattage options, leave others alone)
  • Fan settings (only adjust "target temp")
  • And your clock settings too for memory and core

It's all in a nice easy to use program. If you'd rather use a link to follow for the Polaris BIOS Editor, i can try to search that version number and see if I can find its originating forum.

EDIT:
As far as the UEFI problem, I do not know for sure. I'd google it, but I don't know the specific issue, since my board doesn't seem to have that issue being so old. Which unfortunately means I haven't seen it myself yet. I personally have been away from computers for a few years, so I'm playing catchup myself lol.

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Last edited by pioneerisloud; 11-04-2019 at 09:26 PM.
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post #9 of 11 (permalink) Old 11-04-2019, 11:26 PM - Thread Starter
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I went in and saw the parameters you mentioned. I changed it to 1130mv manually and it's working so far. Sapphire's fan is really loud at max so I reverted the target temp. otherwise I left everything at where you set it.

I'll run it for a few days to see if problems pop up.

Thanks again.

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post #10 of 11 (permalink) Old 11-04-2019, 11:44 PM
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Quote: Originally Posted by Popple View Post
I went in and saw the parameters you mentioned. I changed it to 1130mv manually and it's working so far. Sapphire's fan is really loud at max so I reverted the target temp. otherwise I left everything at where you set it.

I'll run it for a few days to see if problems pop up.

Thanks again.
Just don't forget to save a copy of your original BIOS, just in case.

If you do forget, don't forget you uploaded it here if you need it lol.

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