Extracting HP ATI Mobility Radeon HD 4650 vBIOS?

Hi guys,
Is it possible to extract the vbios of an HP ATI Mobility Radeon HD 4650. I have a dv6 2144 nr and would like to undervolt the card but for the moment seems impossible to get the vbios. Tried GPU-Z and some other ATI utilities but they all fail to extract it. Guessing that HP has some kind of vbios reading protection.

 

The vbios of my Mobility Radeon HD 4650 in my HP Pavilion DV7 3067CL is also apparently locked and can not be read as I have tried GPU-Z and a few other utilities.

 

i don't know about vbios and undervolting stuff but i overclock/underclock my 4650 on dv7-2250em with RivaTuner... it works good. i also tried to mod the vbios but no program can dump it for me... i'm also interested in undervolting gfxx to bring down some temp so i can overclock it a bit more.

 

I'm using RivaTuner as well and the card is quite overclockable compared to my 260m GTX in my Asus that gives artifacts with the slightest overclock. Even if you could undervolt you wouldn't be able to overclock as much because the card won't have that much juice.

Some time ago, I read that the protection is caused by some pin removed on the GPU by HP that does not allow for the vbios reading. Wonder if someone moded his GPU and read the vbios or if we can use the 4650 vbios from some other laptop manufacturer ?

 

well, if it is hardware protection, i doubt that anyone would want to try mods on it coz you can't really add that pin back... if it is just bridged or removed you should unsolder gpu chip, somehow connect back that pin or whatever and solder the gpu back... maybe with solder paste and oven but.. very hard to do... impossible.

 

Well, then all that remains is to try to find an ATI 4650 vbios from other manufacturer, that hasn't locked it. I think that Acer has a lot of models with the 4650 and they don't use silly protections. Though, I don't have any idea if a vbios from other manufacturer would work.

 

But how will u write on a chip if u cant even read it

 

Maybe it is only read protected. It would be stupid to make the chip write protected, since there might be always a chance that HP would need to make a new vbios revision due to some bugs. Maybe I'm wrong and it's read/write protected.

 

Maybe you already used this, but just found that AMD GPU Clock Tool for 5870 works for 4650 as well. Besides the overclocking options it has some voltage options as well.

http://downloads.guru3d.com/AMD-GPU-Clock-Tool-v0.9.26.0-For-HD-5870-download-2383.html

For my card it shows only 3 voltages - 0.9V,1V,1.1V and i see that the default for my GPU is 1.05V for high performance and 0.9V for idle. Reducing the voltage to 1V from there gave me about 3C lower temps on the stock clocks.
So for the moment I'll use that program to undervolt, as it seems that doing that with a vbios is impossible for HP ATI GPU.

 

Stinger is posible change clock gpu?

 

You can over/underclock mobility hd4650 with rivatuner, but my limit is about 65 or 70 MHz on gpu and about the same on memory. After that it crashes very easy.

 

Yes, you can change the clock (overclock) with RivaTuner, or the AMD GPU Clock Tool I linked in my previous post. Just change the core clock and memory clock and press set clocks.
My 4650 works fine on 650/780. The default is 550/667.

 

mine crashes on that one as soon as i start something related with 3d gfx, or furmark... did you put it on furmark for at least half hour to see the stability? also, for rivatuner, before using it with 4650, u need to add card's ID or something (i already forgot...) in Riva's ini file or something like that.

 

I've tested the above clocks with Furmark for 10 minutes only. Tested with 3DMark 06 and Vantage with 5 times repetition. Never crashed on games as well. Raises my GPU temps by ~3C.
About Rivatuner, I also did the modification a while ago. As far as I remember, had to change the card ID to RV730.