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ATI Hd 7950/7970 bios mod thread - Page 5

post #41 of 1284
I'm actually running a Linux Distro called BAMT - based on Debian Squeeze and built specifically for mining crypto-currencies so not using the windows stuff. I can set the memory/cpu speed from the OS but voltage changes are completely ignored. Unlocked cards seem to be able to set the voltage in BAMT fine. My cards run at WOT or nothing so undervolting is a practicality I need!

I'll try setting the clock to 1165+ when I get back from work (6ish) - it's no good for my purposes as when I get to that speed they start making mistakes in calculations. I'd be happy with stock clocks if I could just set the damn voltage! Do you reckon changing the voltage scale will allow me to do this?

Please forgive my noob questions, I'm new to this!
post #42 of 1284
Hello

I have a Sapphire 7950 Boost with default clock 925/1250 and unlocked voltage.
I would love if you could modify that i can raise MAXIMUM vcore up to 1.45 since i have a quite big vdroop and make limits for overclock 1300/1800 if it is possible and make +50% power control setting. I have water cooling so temperature is no problem.
I used the tool from techpowerup and i can raise power control limit to +50% and its working really nice (i did some measurement for verify) but the voltage increase is working only after reboot on default, as soon as i raise the clock the voltage resets to stock somehow.
If you modify my bios I can manually overclock then with trixxx 4.4.0b. I can already overvolt since it is an unlocked card which i verified in hwinfo but i cant raise voltage to more then 1.30v with ANY tool (MSI AB, trixxx) in my current unmodified bios.
My asic is 69.9%.
If you need any more info just say smile.gif

Thank you

Tahiti3.zip 41k .zip file
Edited by suvi - 6/5/13 at 8:50am
post #43 of 1284
Mousebat, here you go, 1.069v boost state, 1.00v state 2. With trixx it may be unlockable in windows like I have done for the gigabyte boosts. Your bios is very similar in voltage tables to gigabyte fy/fx bioses. The bios has a different structure than atomfix's which is quite strange, no state 2 voltage listed.
Other alternatives in the asic voltage table are 1.08 and 1.125v. In terms of calculations per watt, the best I have found is in the range of 1v up to 1.12v. Beyond that, these cards lose a lot of efficiency. A good analogy is my 2500k cpu. For 4.1ghz it only needs 1.22v, for 4.5- 1.33v!

XFX7950DD_FX-795A-TDJC-1069mv-robnitroVOLTUNLOCKMOD.zip 81k .zip file

Quote:
Originally Posted by Atomfix View Post

I feel sorry for the people with Vdrop, mine always stays a consistent 1.225V throughout benchmarking.... including furmark

Kahboom is doing some excellent work with my BIOS. The Voltage has been successfully unlocked on a XFX 7950 DD (795A-TDJC Model) and I can run up to 1.225V just fine at the moment, but I wouldn't go any higher than that (Just a caution to other XFX users)

Now just waiting for the final release to maybe crack the memory voltage and to fix the idle voltage from 0.900-0.950V back to 0.800-0.850V

I seriously doubt it is that stable. NO amount of LLC can be that stable, it either overshoots a bit or undershoots, and this includes cpu's.
Some cards don't give actual voltage or vrm readings, but state VDDC. Try out hwinfo64 and see what it says for gpu vrm voltage out.
post #44 of 1284
Quote:
Originally Posted by robnitro View Post

Mousebat, here you go, 1.069v boost state, 1.00v state 2. With trixx it may be unlockable in windows like I have done for the gigabyte boosts. Your bios is very similar in voltage tables to gigabyte fy/fx bioses. The bios has a different structure than atomfix's which is quite strange, no state 2 voltage listed.
Other alternatives in the asic voltage table are 1.08 and 1.125v. In terms of calculations per watt, the best I have found is in the range of 1v up to 1.12v. Beyond that, these cards lose a lot of efficiency. A good analogy is my 2500k cpu. For 4.1ghz it only needs 1.22v, for 4.5- 1.33v!

XFX7950DD_FX-795A-TDJC-1069mv-robnitroVOLTUNLOCKMOD.zip 81k .zip file
I seriously doubt it is that stable. NO amount of LLC can be that stable, it either overshoots a bit or undershoots, and this includes cpu's.
Some cards don't give actual voltage or vrm readings, but state VDDC. Try out hwinfo64 and see what it says for gpu vrm voltage out.

Spun up Furmark and the voltage stayed a consistent 1.030V But as you said, it could be inconsistent due to the fact that XFX's custom made PCB doesn't include any VRM temp sensors, only the GPU Diode register or anything else.

Trying to push 1.3V and trying to reach 1165MHz on Core just results in a driver crash mad.gif
Edited by Atomfix - 6/5/13 at 1:38pm
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post #45 of 1284
Can you mod a 7870XT (Tahiti LE) BIOS?
post #46 of 1284
7870xt/myst would be awesome to see if modded would do better..

Here's you a PowerColor AX7950 rom, I'll play with it later but figured if you were working on a list of roms. smile.gif
Great info also, +rep!

PowerColorAX7950.zip 105k .zip file
This is the boost rom as well, but voltages are unlocked for me, when in boost mode it maxes the voltage out at around 1.25v..
Edited by MikeMike86 - 6/5/13 at 3:07pm
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post #47 of 1284
Another interested 7870XT MYST owner here. Do you need one of us to upload our stock BIOS in order to see if it can be modded?

I'd be extra stoked if it's possible! smile.gif
post #48 of 1284
Someone Please Mod Msi boost hd7950 ~~~~~~~~~~~~~~~~~~~~

Here is my card info

my Asic 68.1% and desired clock is 1300/1680/1.35 voltage my vdroop is 1.25~1.29 on 1.30 vltage


Here is Stock Msi r7950 boost rom

msi boost Hd7950.zip 41k .zip file


Thanks again
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post #49 of 1284
Thread Starter 
Updated guide, no more submits at this time, have to play catch up will all the PM's and ones already posted, if you posted already i will get to you in order received.
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post #50 of 1284
Quote:
Originally Posted by kahboom View Post

Updated guide, no more submits at this time, have to play catch up will all the PM's and ones already posted, if you posted already i will get to you in order received.

Take your time buddy thumb.gif
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