HD4850 OC and Voltmodding?

[EGM92]

Hey everyone,

If some of you remember my last thread I got a HD4850 with a Accelero twin turbo, OC'd to 690/1183 which is what ATI catalyst caps it as stable. 1mhz over those numbers and I get artifacts all over my cames. I was told by a friend in passing that volt modding/ BIOS flashing the card would get better speeds/performance. Is this true? What does volt modding do exactly? how is it done? The card itself runs at 52C at load (room temp is about 31C) while playing games like farcry 2 maxed out or fallout 3.

If anyone wouldn't mind helping me in the subject I'd appreciate it. I have a Sapphire HD4850 512mb DDR3 non-toxic edition.

http://www.sapphiretech.com/us/products/products_overview.php?gpid=244&grp=3

 

[xBanzai89]

Basically your putting more volts into the GPU. This will allow for a possible overclocking headroom. Though it is possible that you can damage your card if you're not careful. Judging by your temps you maybe able to pull it off. Just ask yourself this. Is it worth getting a few more FPS with the possibility the card will die? If you don't think so don't bother doing it.

If you go to the xtremesystems site they have a whole bunch of info about it.

Hard mod http://www.xtremesystems.org/forums/showthread.php?t=190990
Bios Mod http://www.xtremesystems.org/forums/showthread.php?t=197219

 

[EGM92]

Do I have to hardmod to do the Bios mod??

 

[EGM92]

I'm trying to flash from my USB stick. I can't seem to get any of the bios versions listed on that link you posted xBanzai89, except for the Toxic version. All the other bios files it tells me that it's not recognized but when I load up any of the toxic versions of the bios from

http://www.techpowerup.com/vgabios/...ire&model=HD+4850&interface=PCI-E&memSize=512

I get it to read the bios and it says:
Old SSID: 0502
New SSID: E810
SSID mismatched

Any idea what I have to do? or what I should do? Why arn't the other bios' listed on that site working? I'd really appreciate the help.

I'd just like to add that when I try to use any of the Bios' listed on the site other than the toxic I type the command like C:\atiflash -p 0 1.bin (I renamed the file) and it says "Invalid PC Bios image"