Undervolting PowerColor HD6850

[CRAZyBUg]

Hi,

I am running PowerColor HD 6850 (not PCS+ neigther SCS just normal HD 6850), this one http://www.powercolor.com/de/products_features.asp?id=273 to be correct.


I tried to undervolt it using RBE, resulting in Bluescreens (BSOD 3b).

Before I flashed the cards bios, I did a few dumps using gpu-z, rbe and winflash and verified their md5sums to be identical.

Barts-gpu-z.bin 58577a53f4c18a97081e86e894b0b43c

The other 2 files are each a modified BIOS. One got a changed Clockinfo 01's voltage (0.93 instead of 0.95), the other got changed RAM frequencies.

I hope this helps to make BIOS modifing work with RBE and HD 6850 cards.

If any more information is needed, please tell me.


The modified rom's are not working, pls don't download without reading.

 

[Black_Lion]

Did you see if the GPUz is reading the new voltage? (can't help without this info)

Also, why do you want to undervolt the card? If it running too hot, it might be a better idea to open the card up, clean it, place some new and better thermal paste and also run the fan a little bit faster.

 

[NinkobEi]

Sorry if this is an obvious answer that you already know. If you plan on Undervolting you will likely need to underclock it as well, perhaps by a good margin. ~100mhz or so

 

[CRAZyBUg]

Did you see if the GPUz is reading the new voltage? (can't help without this info)

Also, why do you want to undervolt the card? If it running too hot, it might be a better idea to open the card up, clean it, place some new and better thermal paste and also run the fan a little bit faster.

The card is new, so I don't think it is going too hot. Nevertheless, the fan is really loud when running games. I want to undervolt mainly to save some current to longer it's life cycle and to get it a little cooler. My whole PC is undervolted, CPU, NB, SB, RAM.

Normaly I would prefer using ATI VISION Engine (CCC) to undervolt through profiles.xml, but the card doesn't commit the changed voltages. (While my old HD4850 did)

Using ATI Tray Tools to undervolt from 1.15V to 1.08V is working, GPU-Z and CPUID HWMonitor are both showing 1.08V after changing. But I don't want to run a static tool in the Background which forces the card to run 775/1000@1.08V in idle, instead of 100/150@0.95V.

Sorry if this is an obvious answer that you already know. If you plan on Undervolting you will likely need to underclock it as well, perhaps by a good margin. ~100mhz or so

HD 6850 got an idle frequency of 100/150 while running with 0.95V, by manufactor default.
And it's running 775/1000 with 1.15V by manufactor default.
I changed the voltage successfull using ATI Tray Tools to 1.08V, but ATI Tray Tools only knows one performance state, while the card changes it's states dynamically.

 

[CRAZyBUg]

Just made 2 Shots of gpu-z.

The first pic is made with newest ATI drivers installed.
The seconds one is made between the reboot after flashing the card and before the automated driver install of win7 occurs.