Is ATI vBIOS flashing more risky than with Nvidia?

On to serious vbios stuff...
I really need to learn more about ATI in general, hoping someone can answer a few questions quickly.

Mainly I'm wondering if it really is more risky to flash, because people seem to more or less never even recommend flashing with DOS. And then I've also heard some strong discouragement when flashing to a vBIOS of a different brand.

-Have you ever flashed an ATI card to a vBIOS of different brand?

-Have you ever successfully blind flashed an ATI card, and if so, why did you have to do it?

-Have you ever bricked an ATI card, if so, how?

Thanks.

 

flashing to a diferent brand is not recommanded in laptop simply because laptop have limitation on the card they accept


i flashed my gpu many time but only to modified bios from my own machine

 

well.....
Thats doesn't really answer my question, unless you are saying that is the only reason I should be afraid of flashing across brands.
That really isn't the only reason its 'not recommended', is it? That would mean that all ATI cards are the same except for their vBIOS.

Basically the one big thing I'm looking for is something like nvidia board IDs that affect compatibility regardless of the cards model and vram type. If this really doesn't exist for ATI then that would be awesome but I'm not convinced.

I think that there could be at least 2 versions of the ATI 3650 ddr2 board for example and the VBIOS would not be compatible. With nvidia, I have experienced this and it seems the vbios are compatible. So this is why I'm asking specifically if ATI cards are more sensitive to base level VBIOS differences and if overriding board ID with an ATI card is a very bad idea.

 

this ID exist how ever with ati there is also a manufacturer ID

and the problem with flashing Vbios depends on the specific laptop because some such as alienware search for a such ID and refuse to boot unless they detect the ID they wan

an other issue is that vendors are autorised to make changes to the boards so some Vbios might just change the cards into paper weight

 

Yes.

Yes. A HD3650. Bootable usb flashdrive with autoexec file containing the flashing commands.

Yes. But even with the normal bios the laptop already had troubles with the card(HD4850) so blind flashing didn't work there.

 

This is hilarious in a way, those are the 2 cards I have and the reason I made this thread Were you flashing for the same reason I am too? lol.
I remember when you were looking to downgrade your gx620 and I suggested the HP 8530p fireGL cards. I have some of them now and they have limited functionality on the gx620. What did you do? I was thinking of flashing them with an Acer 3650 BIOS.

and what about the 4850?
I wanted to get my internal display working with the MSI card on other laptops. I think it works fully with external display on the m570tu, so maybe there is less risk.

@ granyte, thanks, that is what I wanted to know. Indeed, some of the HP 3650 do not have an eeprom on the board at all. I should find a picture of the acer 3650.