Sapphire RX 480 Nitro+ OC 8GB (11260-01-20G) modded BIOS 29+MH + downvolt

Jukebox

Havane said:

In polaris bios editor, where do you undervolt the gpu, for exemple to 900mv ?

ROM Vgpu changes just ignored (reason unknown). Just make downvolt with Sapphire Trixx

Wolf0

Havane said:

In polaris bios editor, where do you undervolt the gpu, for exemple to 900mv ?

You cannot - not such that it's effective on linux, IIRC. Polaris BIOS Editor is a simple tool with a limited feature set.

Wolf0

Jukebox said:

Havane said:

In polaris bios editor, where do you undervolt the gpu, for exemple to 900mv ?

ROM Vgpu changes just ignored (reason unknown). Just make downvolt with Sapphire Trixx

Not all of them, just the ones doable with PBE.

Jukebox

Wolf0 said:

Jukebox said:

Havane said:

In polaris bios editor, where do you undervolt the gpu, for exemple to 900mv ?

ROM Vgpu changes just ignored (reason unknown). Just make downvolt with Sapphire Trixx

Not all of them, just the ones doable with PBE.

Sure, I know. Base voltage for 300 MHz gpuclock is changeable, I mentioned it in this topic.
I'm increasing it from 800 mV to 875 or 900. It helps to keep card stability during undervolting with Trixx.

Hotmetal

So if we're setting it -100 in Trixx without any issues, we can change it to 800 mV in the BIOS without having to use Trixx?

Jukebox

Hotmetal said:

So if we're setting it -100 in Trixx without any issues, we can change it to 800 mV in the BIOS without having to use Trixx?

no. Trixx applies -100 mV offset to all Voltage table.

If you leave base voltage unchanged (0.8 V), you'll have only 0.7 Vgpu when idle. It is too little to keep stability.

Hotmetal

So there's no way to edit the bios to apply static mV drop (to all voltage table) without having to use Trixx?

Wolf0

Hotmetal said:

So there's no way to edit the bios to apply static mV drop (to all voltage table) without having to use Trixx?

There is - for Sapphire Nitro+ cards, all the ones I've seen have one more Voltage ID (and value) in the voltage regulator init stuff over stock, and it's the one you need you set a global core offset that will work on all platforms. By default, its value is set to 4 - the way this value works is that it is a signed byte - times 6.25mV. So they overvolt the core (all states) by 25mV. You could change it to -25mV by setting it to 0xFC.

If it's not a Nitro+, you'll need to add the value, and that's major surgery to the VBIOS.

lmaonade80

Been trying to get this to work for 2 days now. Always one card has 0 mhs, and a 2nd starts at 28 and drops until claymore starts over.

Havane

About 2.5% more sol/s with gpu @1340 MHz and timing 1625 strap : 171 vs 175 sol

If I change the Gpu :
@1375 : 177
@1340 : 175
@1300 : 172

And same sol rate with mem @2000 or 2100 MHz

andrewaka

Jukebox, catch it

andrewaka

thats only 1 card of 7. now rig is working on 184-190mhs. if the last one will be flashed, i hope the rig will show 188-195

1234xm

i change the driver. now i can mine ETH, but cannot mine ZEC. where is the problem? any help much welcome.thx

Jukebox

1234xm said:

i change the driver. now i can mine ETH, but cannot mine ZEC. where is the problem? any help much welcome.thx

Both ZEC and ETH miners have some undefined issues with starting right after using some 3D apps (games, etc), not everytime, but sometimes. Can not find dependency.

But everyting OK after system reboot. Maybe it's something drivers or OpenCL libs related.

Havane

I have observed also something strange : after few days, sometimes, a fan jump over 90%, on my 6 Rx480 rig. Everything is OK after a reboot : 60° / 60%

Vorlian

Tried with

1125/2080 getting 17mh
1125/2000 getting 26-27mh
used silent_nitro1625to2000strap+VDROP
any suggestion?

Jukebox

Vorlian said:

Tried with

1125/2080 getting 17mh
1125/2000 getting 26-27mh
used silent_nitro1625to2000strap+VDROP
any suggestion?

1. Check page 5 or 6 of this topic for last V4 ROM mod.
2. Unlock voltage regulation in MSI AB
3. Your memchips are not so lucky to keep 2080 MHz
4. You use dual mining mode, 29+ Mh is only for single ETH mode.

madtum

I've been lucky with one card and unlucky with another. very good bios when it works!
Is a similar bios released for the nitro rx470 8gb ? I cannot find a good one around here

cleverserge

Hello, everyone

My rig config is
6xSapphire RX 480 8G modded bios with powersafe rom
H81 PRo BTC
Win 10 64bit
16.9.1 Crimson driver
USB powered risers

I have a strange problem with Claymore Ethereum miner 7.4 (ZEC miner is OK). The matter is that the hashrate of GPU0 is 14-16 MHs (all the rest 5 cards are 29MHs)
GPU0 is the card that connected to 16x PCI-E slot and the monitor is connected to it. I tried to switch the "main" card with another 2 cards(reconnect the riser to 16x PCI-E slot) and the result is the same after reboot (GPU0 shows 14-16MHs, GPU1-GPU5 show 29MHs). So the problem is not in the card. Maybe somebody faced somewhen with such problem? Are there any solutions of it?

Thanks for help.

Jukebox

cleverserge said:

Hello, everyone

My rig config is
6xSapphire RX 480 8G modded bios with powersafe rom
H81 PRo BTC
Win 10 64bit
16.9.1 Crimson driver
USB powered risers

I have a strange problem with Claymore Ethereum miner 7.4 (ZEC miner is OK). The matter is that the hashrate of GPU0 is 14-16 MHs (all the rest 5 cards are 29MHs)
GPU0 is the card that connected to 16x PCI-E slot and the monitor is connected to it. I tried to switch the "main" card with another 2 cards(reconnect the riser to 16x PCI-E slot) and the result is the same after reboot (GPU0 shows 14-16MHs, GPU1-GPU5 show 29MHs). So the problem is not in the card. Maybe somebody faced somewhen with such problem? Are there any solutions of it?

Thanks for help.

Try to test this card alone.

cleverserge

Jukebox said:

cleverserge said:

Hello, everyone

My rig config is
6xSapphire RX 480 8G modded bios with powersafe rom
H81 PRo BTC
Win 10 64bit
16.9.1 Crimson driver
USB powered risers

I have a strange problem with Claymore Ethereum miner 7.4 (ZEC miner is OK). The matter is that the hashrate of GPU0 is 14-16 MHs (all the rest 5 cards are 29MHs)
GPU0 is the card that connected to 16x PCI-E slot and the monitor is connected to it. I tried to switch the "main" card with another 2 cards(reconnect the riser to 16x PCI-E slot) and the result is the same after reboot (GPU0 shows 14-16MHs, GPU1-GPU5 show 29MHs). So the problem is not in the card. Maybe somebody faced somewhen with such problem? Are there any solutions of it?

Thanks for help.

Try to test this card alone.

As I said before I tried several cards set as "main"(connect to 16x PCI-e slot and plug monitor to it) and always GPU0 shows 14-16 MHs, GPU1-GPU5 29MHs. The matter is not in specific card.

Havane

Try with a working riser? Or bios setting

wonderfullife

The only way I could get any GPU to run in the "main" PCIE slot was setting it's memory clock lower, 2035 for a sapphire RX8g480, 2080 for XFX GTRs. On risers all cards run 2170MHz / 30.5 Mhs . All gpus have moded bioses. If I i raise the memclock I just get artifacts and your usual BSOD.
Anyone got an ideea why cards seem more unstable in the PCI-E slot then on risers? I also tried placing another 480 in the boards second PCI-E slot, same result.

tc61

Does anyone have a downvolt rom for a Asus rx480 8gb?

raidersan

Can anybody think of a reason why with Jukebox's original and V4 BIOSes I can "only" get to 26Mhs instead of the 29+ everybody else seem to get? I am on ETHOS with sg_miner
Many thanks

ober

Did you try windows+claymore? Just to see if there is a difference in hash rate.

raidersan

Haven't windows, but Claymore does give me 29. But then again Claymore takes a cut doesn't he?

Jukebox

raidersan said:

Can anybody think of a reason why with Jukebox's original and V4 BIOSes I can "only" get to 26Mhs instead of the 29+ everybody else seem to get? I am on ETHOS with sg_miner
Many thanks

Memory OC'ed too much. Unlucky memchips.

raidersan said:

Haven't windows, but Claymore does give me 29. But then again Claymore takes a cut doesn't he?

1% in ETH only mode.

blasteris

Hello, new miner here ;-). I just made half of my rig (still waiting for 3 additional cards). Been mining for a day using v4 bios (big thanks for that) and noticed a strange thing, don't know if it's normal or not, my hashrate drops after few jobs by 3-20MH.
I am using Claymore dual miner, win10, 16.9.2 drivers, 3xRX480 nitro+ 8GB.

wonderfullife

@blasteris , try to adjust gpu and memory clocks/voltages, each gpu has it's own sweetspot. For monitoring hashrate the best thing you can do is find stable settings and see what your avg hashrate will be over the next 2-3 days.