RX470 4GB Custom rom

[brizio71]

Hello,
is it possible make a custom rom with RX470 4GB an done for RX480 8GB ?
thx

[Eliovp]

I'll see to go buy a 470 this weekend and getif there's one available

[adaseb]

I'll see to go buy a 470 this weekend and get one available

Nice thanks!

[Eliovp]

MM kind of misstyped there. "if there's one available"..

Just curious what i can do with those

[dumada]

MM kind of misstyped there. "if there's one available"..

Just curious what i can do with those

If you can get one to overclock the memory to 2200 MHz and tight timing, then the 470 will be as good as the 480.

[Eliovp]

MM kind of misstyped there. "if there's one available"..

Just curious what i can do with those

If you can get one to overclock the memory to 2200 MHz and tight timing, then the 470 will be as good as the 480.

Who knows 

[Mzie]

MM kind of misstyped there. "if there's one available"..

Just curious what i can do with those

If you can get one to overclock the memory to 2200 MHz and tight timing, then the 470 will be as good as the 480.

 how much power does it consume on overclock?

[brizio71]

Hello,
is it possible make a custom rom with RX470 4GB an done for RX480 8GB ?
thx

Yes - mine is hashing ~27MH/s.

Can you please write a step-by-step procedure to have a custom rom ?

thx

[Tmdz]

The best thing to do would be practice flash some older cards that have a dual bios switch.

Look up some guides on atiflash, boot into dos and run through the different commands. flash, backup etc and then you should be good to flash the newer cards without screwing them up

If you make a mistake then you can just flick the switch and youll be fine, re-read the guilds and try again.

[brizio71]

The best thing to do would be practice flash some older cards that have a dual bios switch.

Look up some guides on atiflash, boot into dos and run through the different commands. flash, backup etc and then you should be good to flash the newer cards without screwing them up

If you make a mistake then you can just flick the switch and youll be fine, re-read the guilds and try again.

I did with all my HD7970 cards, I would like to know the software to use for make a new bios and I have read in other post the signature problem, can I use the same procedure describe for RX480 card ?

[bobben2]

Hello,
is it possible make a custom rom with RX470 4GB an done for RX480 8GB ?
thx

I made a custom rom for my Sapphire RX470 8Gb card.  I used the Polaris Bios editor tool.
It should work for any RX4.. card.
I changed the memory timings for the 2000 MHz strap to equal that of the next lower strap - and voila
the hash rate went from 23Mh/s to 25Mh/s just by that change alone.  I also lowered the core frequency
from 1260 to 1150 to save some power.   I will look at lowering voltages next ..
But the custom rom development is a pain here - Custom roms are done in Windows, then I have to reboot
into Linux to run miner tests...

[sp_]

You just need somebody to crack it without sideeffects. You can ask ppl here: http://www.pouet.net
Some of them have been doing this shit for 30 years...

[Eliovp]

Hello,
is it possible make a custom rom with RX470 4GB an done for RX480 8GB ?
thx

I made a custom rom for my Sapphire RX470 8Gb card.  I used the Polaris Bios editor tool.
It should work for any RX4.. card.
I changed the memory timings for the 2000 MHz strap to equal that of the next lower strap - and voila
the hash rate went from 23Mh/s to 25Mh/s just by that change alone.  I also lowered the core frequency
from 1260 to 1150 to save some power.   I will look at lowering voltages next ..
But the custom rom development is a pain here - Custom roms are done in Windows, then I have to reboot
into Linux to run miner tests...

The voltage is another story, you can set each vid for each dpm manually, but you'll have the risk that the controller won't deliver enough power to operate decently.

That's why it's more interesting to tell the voltage controller to start at a lower voltage offset.
in a lot of cases you can do this by modifying the vddc offset in the rom, but with these rx's, there is no voltage offset in the rom, you can add this though, but that's more than opening a tool and changing some numbers 

Working on one for the 480's though

Going for minimal power and maximum hash!

[sp_]

It's been done, but then you need to also disable driver sig enforcement.

That's not a proper crack.

[nerdralph]

MM kind of misstyped there. "if there's one available"..

Just curious what i can do with those

If you can get one to overclock the memory to 2200 MHz and tight timing, then the 470 will be as good as the 480.

 how much power does it consume on overclock?

I prefer to drop the core clock such that she mines at 25MH/s - wall draw with one card is ~175W, system idle draw is ~50W - 55W, so I estimate ~120W - 125W.

That doesn't accurately reflect the card power usage for two reasons:
1) It uses power even at idle (I've measued a difference of over 10W for some GPUs at idle vs running off the iGPU)
2) PSUs are very inefficient (often <75%) below 10% load.

The best way to do it is to measure marginal power increase from adding a 2nd card.  If your system uses 175W mining with one card, I would bet it will use around 325 with 2 cards (i.e. 1 card uses about 150W).

[nerdralph]

MM kind of misstyped there. "if there's one available"..

Just curious what i can do with those

If you can get one to overclock the memory to 2200 MHz and tight timing, then the 470 will be as good as the 480.

But with 32 instead of 36 compute units, you won't be able to underclock it as much.

[Q_R_V]

But with 32 instead of 36 compute units, you won't be able to underclock it as much.

True, but price is lower and because there is 32 CUs they will produce almost the same amount of heat as lower clocked 36 CUs (based on comparison between 380 and 380x)

[Amph]

MM kind of misstyped there. "if there's one available"..

Just curious what i can do with those

If you can get one to overclock the memory to 2200 MHz and tight timing, then the 470 will be as good as the 480.

 how much power does it consume on overclock?

I prefer to drop the core clock such that she mines at 25MH/s - wall draw with one card is ~175W, system idle draw is ~50W - 55W, so I estimate ~120W - 125W.

That doesn't accurately reflect the card power usage for two reasons:
1) It uses power even at idle (I've measued a difference of over 10W for some GPUs at idle vs running off the iGPU)
2) PSUs are very inefficient (often <75%) below 10% load.

The best way to do it is to measure marginal power increase from adding a 2nd card.  If your system uses 175W mining with one card, I would bet it will use around 325 with 2 cards (i.e. 1 card uses about 150W).

even this way it's not perfect, the overall load for the system(not gpu) will increase if you add more gpu, but still better than the other method yes

[dumada]

MM kind of misstyped there. "if there's one available"..

Just curious what i can do with those

If you can get one to overclock the memory to 2200 MHz and tight timing, then the 470 will be as good as the 480.

 how much power does it consume on overclock?

I prefer to drop the core clock such that she mines at 25MH/s - wall draw with one card is ~175W, system idle draw is ~50W - 55W, so I estimate ~120W - 125W.

That doesn't accurately reflect the card power usage for two reasons:
1) It uses power even at idle (I've measued a difference of over 10W for some GPUs at idle vs running off the iGPU)
2) PSUs are very inefficient (often <75%) below 10% load.

The best way to do it is to measure marginal power increase from adding a 2nd card.  If your system uses 175W mining with one card, I would bet it will use around 325 with 2 cards (i.e. 1 card uses about 150W).

even this way it's not perfect, the overall load for the system(not gpu) will increase if you add more gpu, but still better than the other method yes

I agree with that. Also the environment temperature and ventilation is very important. For my system, if the environmnet is low, the power consumption is 1020. If the env temp is 4 C higher, the power consumption is 1050.

[brizio71]

which is the difference between use a modded bios or use wattman in order to optimize the gpu ?