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

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

Nice thanks!

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  ;)

 how much power does it consume on overclock?

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

thx

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 ?

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...

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...

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!

That's not a proper crack.

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).

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)

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.

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

wattman is a pain and resets itself after every crash.

Wattman is a pain in the ass for sure.  thanks obama.  anyways modded 470 bios is nice, on linux, but someone correct if im wrong you cant do it yet on win7 or 10.

Some ppl say patched driver is making problem with more the 3 cards on system, it should be more investigated
Also patched DLL must be used just for the driver from which it was build

Also same card use different memory so that also must be checked before flashing bios from the net, even if the card is same model

Wolf0, could you upload somewhere your custom rom for Sapphire rx 470 4gb reference please?

reference sapphire 470 4gb modded rom with the 1500memory strap timing set to 1625, 1750, and 2000:  http://www.megafileupload.com/k2gu/470_4gb_sapphire_modded_bios.rom

I use -12.5% (1065)/850mv core and 2000/850mv mem for high mhs and power efficiency

thanks yeah, modded all my cards, basically just changed the timings.  using trixx (fuuuuuu wattman), just make sure it dont restart :)

Size (256K) of your vBIOS is not standard (512K). It can brick GPU if flashed

I noticed that message too. Seems 256k is the right size.. check out the size of other 470 (or even 480) roms available to compare the size

can i flash it to Sapphire Nitro 470 8Gb ?

No. You need to extract your rom with atiflash, edit it with Polaris bios editor and flash it back with atiflash

Thank you for sharing !
What about the hash rate you are archiving with this ROM?

Also how is the power distribution with the reference 470?

Reference 470 has 4+1 phases

Reference 480 has 6+1 phases

For the 480 4 phases are supplied by the 6 pin and 2+1 phases are supplied by slot.

This COULD mean that the 470s all 4 phases get supplied by the 6 pin and only the +1 (= for vram) is supplied by the slot.

The pci-e slot power draw from the ref. 470s would in this case be way lower compared to the ref. 480.

If that is the case, then it is quite safe to use the USB risers. If not, it is still safer than the RX 480.

does anyone ever tried this multiplier?
http://www.ebay.com/itm/PCI-e-Express-1X-to-3-Port-1X-Switch-Multiplier-HUB-Riser-Card-USB-Cable-/262501285031?hash=item3d1e4bbca7:g:zTwAAOSwa-dWhMvm

tks,

yes i have and i couldnt get it to work.  it recognized the multiplier but i couldnt get it to recognize a vid card in the slot.  even if its the only card on the pc.  I think there is good reason more dont use these.  There is a limit to the pcie lanes on a cpu and once you exceed that it will not post.  I dont know why the splitter didnt work with only one card other than it has a proprietary chip onboard and maybe that doesnt like vid cards. ethernet adapter or modem etc mifght be ok, idk

Best Regards
d57heinz

AFAIK this "memory voltage" is memory controller voltage and changing it via WattTool is definitely have influence on stability - when I set it less then 0.95v my card don't want to work with high memory freq.
I change the gpu voltage with voltage offset option, not directly in table so I think it is not the dependency between gpu voltage and mem controller voltage that matters...

Haleluja!

Something i've been shouting for weeks :) Finally someone who is on the same line!

:)

Sorry, just updated the post above ... see pics.

So why if I lower it in WattTool below 0.95 with 2200 memclock I have instability? And no problems with 0.95 or higher

Hmmm - but this tables in polarisbioseditor and watttol look so similar. You say that they mean different?

Ok. Thanks for the screen and explanation.

I did a lot of tests to figure out witch voltage is wich and got only confusing results. There is clearly some synchronisation, when you change one voltage the others are often modified too.

Does someone have a clear idea how the whole thing works?

Does anybody have a stock BIOS collection for Sapphire RX470 4Gb reference models?

I ran into a rather strange problem:
- bought 5 of these cards (exact same P/N and SKU, roughly similar product numbers)
- saved the full 512Kb image of 1 card as backup (I know, I should have saved them all separately and compare the hashes...)
- flashed a modded 256Kb BIOS (I prepared this in advance, based on the image file on techpowerup)
- noticed something is very wrong with one specific card
- restored the backup BIOS image to all cards
- problem persisted, so I pulled that single card out and used the remaining 4 with my modded BIOS re-applied
- I got the card replaced under warranty (the new one has the same P/N and SKU) but I flashed it, and now it's dead (even after restoring my backup BIOS)

Yes, I know I was stupid I didn't make a unique backup of the replacement card's ROM after the first incident. It's very obvious in hindsight now...
Although, I did always check the memory type with GPU-Z and it always reported Hynix (that's why I was confident I really have identical cards).

Any suggestions?

Any Modded Rom for AMD Sapphire Nitro+ Rx 480 8GB OC for 100+ Sols/s on zcash
My GPUs are ellesmere with Samsung chip
http://gpuz.techpowerup.com/16/11/12/9fu.png
How to lower the power from wattman builtin tool?

any

custom firmware

for asus 470 4gb???