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Hello, i'm a newbie on eth mining.

I bought Sapphire 470 4Gb Reference because I want flashing with Oakheart's or Boysie's roms. When I checked in with GPU-Z, it has a memory chipset from Elpida, while the Oakheart's and Boysie's roms is from Hynix.

I have searched on internet but have not found a modified rom for Sapphire 470 - Elpida memory. Can anyone here who can modify it or show me the way what must i edit to modify it? The target is 28-29 MH for single eth mining as oakheart and boysie roms.

This backup of the original roms: https://drive.google.com/file/d/0B1_9MOwzVXZwdExYZy1IUE9rTGc/view
Oakheart roms : https://forum.ethereum.org/discussion/8845/rx-470-mining/p11
Boyisie roms : https://forum.ethereum.org/discussion/9533/28mh-470oc-nitro-4gb-boysie-rom-dual-mining

Thanks

You should increase your hashrate to 27Mhash with a simple copy of memory timings from 1500 or 1750 strap to 2000.

very interesting, thanks for sharing your elpida rom.
Here is what we have - compare original straps from elpida and hynix sapphire ref rx470.

elpida (sapphire ref 470)
1375: 777000000000000022AA1C00EF516A3790550F14B20B9505006AE40074021420CA89C0A8020004C 01510232859283315
1500: 777000000000000022AA1C00315A6B3CA0550F15B68C1506006AE4007C041420CA8980A9020004C 01712262B612B3715
1625: 777000000000000022AA1C0073627C41B0551016BA0D9606006C060104061420EA8940AA030004C 01914292E692E3B16
1750: 777000000000000022AA1C00B56A7D46C0551017BE8E1607006C07010C081420FA8900AB030004C 01B162C3171313F17
2000: 999000000000000022AA1C0018F77E4FD055121946501708006C07011D0C1420FA8980AC030004C 01E19323781364718


hynix (sapphire ref 470)
1375: 777000000000000022339D00CECD593980551111AE8A84080048C6006C0014206A8900A00200312 0140F262B88252F15
1500: 777000000000000022339D00CE516A3D9055111230CB4409004AE600740114206A8900A00200312 0150F292F94273116
1625: 999000000000000022559D0010DE7B4480551312B78C450A004C0601750414206A8900A00200312 018112D34A42A3816
1750: 999000000000000022559D0031627C489055131339CDD50A004C06017D0514206A8900A00200312 019123037AD2C3A17
2000: BBB000000000000022889D0073EE8D53805515133ECF560C004E26017E0514206A8900A00200312 01C143840C5303F17

samsung (power color red dragon 480)
1375: 333000000000000022CC1C008C515A3DC0570D132DCB74090048C7007A0014207A8900A00200000 0150D293197282E15
1500: 555000000000000022CC1C00AD595B41C0570E14B00B450A0068C70003011420FA8900A00300000 0170E2B34A42A3116
1625: 555000000000000022CC1C00CE616C47D0570F15B48C250B006AE7000B031420FA8900A00300000 0190F2F39B22D3517
1750: 777000000000000022CC1C00106A6D4DD0571016B90D060C006AE70014051420FA8900A00300000 01B11333DC0303A17
2000: 777000000000000022CC1C0031F67E57F05711183FCFB60D006C070124081420FA8900A00300000 01E123A46DB354019
Straps are completely different, never use bios from internet, modify it by yourself!

https://s10.postimg.org/70jsz20k9/2016_09_28_210437.png
How about other parameters such as GPU, Powertune, Memory, and also other timing. Leave it default??


Timing straps before 1375 is also different with Hynix.

https://s21.postimg.org/kc5c7qc6f/2016_09_28_203944.png

Elpida : 200, 400, 800, 1000, 1250, 1375, 1425, 1500, 1625, 1750, 2000
Hynix : 400, 800, 900, 1000, 1125, 1250, 1375, 1425, 1500, 1625, 1750, 2000

Where is timing strap should I change in my rom file.. Just 1375, 1500, 1625, 1750, 2000 and leave others (200, 400, 800, 1000, 1250, 1425) with default value??

Today I tried to copy 1500 value to 1625, 1750 and 2000. The others left as is. The result is hashrate increased from about 22.5 MH to about 25.3 MH.

What should I change again to further increase hashrate to 28 or 29 MHS ??

https://s15.postimg.org/vrj8582jv/2016_09_29_093754.png

You can try 1625 or even 1500 strap for 2000 but not set high memory clock in bios! Only in WattTool after system starts.
And check for memory errors in hwinfo64 ... If there will be huge amount then better not to use so hard settings.

Overclock the memory to go above 27

Could somebody link to which specific Sapphire model these timings/roms works with?

there is a thread for this specific Bios

Looking for a stock rom for a sappire 470 reference with micron memory.

I pulled the stock rom with GPUz, instead of ATIWinFlash.  The file size is smaller, and I think this lead to the flash going poorly.

At least this is what I've been able to come up with by reading multiple postings on this and other sites.  Any insight welcome...  ;D

BIOS size is not a problem, the last 256KB are FF padding.
I've flashed cards with different ROM size without any problem

I've not had issues with other cards, too, but with this one I have. Not sure what else to try. Need to get back to stock somehow.

Your rom does not work for a 'reference' card, only the NITRO.  I did not catch the card difference at first...  This thread is for the 'reference' design.  Luckily, i was able to flash back  :D