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Author Topic: flashing a 6950 with 1GB using the 6970 with 2GB BIOS  (Read 17555 times)
cicada
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July 18, 2011, 06:29:20 PM
 #41

i did this mod a few weeks ago on my 2gb Sapphire hd6950... it allowed me to flash with a modded bios
from my original bios (modded with rbe) but after a reboot the card still had only stock shaders Shocked(

most rubbish..... when people say they are "laser cut" are they referring to the gpu die its self ?!



It's hit or miss whether or not the shaders will be available on any given card, even two cards in the same model/revision.

Nobody knows for certain how the shader cores are disabled on these cards, the people insisting 'laser cut' are talking out their ass or parroting someone else who was talking out their ass Wink

When you see 'laser cut' you can assume this to simply mean 'disabled in hardware' until someone can confirm.

It's also possible the disabled shader cores are simply non-functional on many of these cards, bottom-binned so to speak.

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ehmdjii
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July 19, 2011, 08:03:26 PM
 #42

so after all i did manage to use this physical mod to flash my sapphire 1gb.
i used winflash and i said flash was ok!

unfortunately i still only see 1408 shaders instead of 1536 Sad

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July 22, 2011, 10:29:43 AM
 #43

i just got a brand new powercolor 6950 1gb, good thing is that it's flashable with no hardware mod, but i couldn't unlock the shaders. oh well, it's 1gb version so i didn't really expect shaders to unlock. i just wanted it to be flashable without hardware mod, which it was Smiley

Jack of Diamonds
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July 22, 2011, 10:45:21 AM
 #44

so after all i did manage to use this physical mod to flash my sapphire 1gb.
i used winflash and i said flash was ok!

unfortunately i still only see 1408 shaders instead of 1536 Sad

That's because the worst binned 6970's become 6950's.
I.e. the last shader units are of very poor quality and are physically burned off from the GPU die with a laser.

Some 6950 GPUs are fully functional 6970's, artificially binned as 6950's to meet market demand.

Whether you get one of these units is just a pure luck of the draw. Just about all of the 2GB versions can be unlocked & AMD even included a BIOS switch for that purpose

GPUs in the 1GB versions are mostly the poorest yields at TSMC that are not fit to be full 1536 shader GPUs but not weak enough to be fully discarded/downgraded into 6870 GPUs with even more shaders cut off
if you do a hard mod by soldering & get lucky with a relatively good chip it might work, but with a much lower success rate than the 2GB ones

For you to see the full 1536 shaders, they need to be there physically, if not you will only see 1408 even after a successful flash

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asher2
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July 31, 2011, 07:27:30 PM
 #45

I'm glad to see people getting use out of the mod!

As an above posted mentioned, solid core wire is much better to use. I didn't happen to have any handy at the time. You can get it from ethernet cable (not all) or breadboard jumper cable. Those are the easiest places to find it.

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August 01, 2011, 01:51:51 AM
 #46

I was thinking about trying this mod, but no one seems to have success with it yet besides you asher.  And you only got it to work on 2 out of 5 cards?  What kind of results did you get with it?

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August 02, 2011, 01:24:59 AM
 #47

Anyone else try this with the Sapphire 1gb 6950 without bios switch? I have two - and had the same error when I tried flashing in DOS. I don't want to risk bricking my cards again if it's impossible to unlock the shaders - even with an accepted flash.

Asher, do your successfully flashed cards now show the 1536 shader count?

cicada
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August 02, 2011, 05:01:30 AM
 #48

Anyone else try this with the Sapphire 1gb 6950 without bios switch?

I've done it with an XFX 1GB 6950 - it allowed me to flash properly but didn't have any luck unlocking shaders.  From what I've read the Sapphires should allow flashing the BIOS the same way, but it's a gamble whether or not you'll get lucky and unlock shaders..

I just used a circuit-writer pen to mod a second card:





Allowed me to flash the card with no problem again, but no unlocked shaders on this one either.

I'm not certain if I'm going to bother modding my other two cards, the heatsinks only came off these two so I could re-do the thermal paste.  

[edit]

fancy smartphone camera makes an amazing magnifying glass Wink

This is also removable with a cotton swab and a bit of acetone.

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