This mod works just like the X800 one, (you gotta download the modded flashrom) (My card has 1.6 NS memmory, and is AGP, from what I understand, PCI-E CAN't be flashed. Completing this mod successfully will unlock all of the 16 pipelines your X850 Pro has. In order to have a moddable card you just need to have the 1.6ns memmory (I do not think 2.0ns works) and the yellow VIVO thingy next to your purple power input. All credit goes towards W1zzard from forums.techpowerup.com all I did was change the guide from X800 to X850 Performing the Mod: Download modified flashrom. Download Bios from here. I suggest the latest X850XT PE Bios. A little sidenote: Many people complain that they get a "file not found" error when trying to flash the bios under DOS. The problem is that DOS does not know long filenames, so all files are truncated to some funky names like Powerco~1.bin. Either use the dir command, when in DOS, to find out the short filename or rename the file to something shorter while still in Windows. Make sure the card can reliably run at the clock speeds of the new bios (with ATITool, for example). Use the modified flashrom to flash the Bios to the card. More extensive flashing instructions can be found here. They talk about atiflash - you use the modified flashrom, usage is the same. After bootup Windows should automatically install the X800 XT PE driver. Verify the number of active pipelines using ATITool. Go to Settings -> Overclocking. The list there shows the number of pipelines the card is running with. If you want to remove all traces of previous Bios flashes (for example if you flashed the Gigabyte Bios): Use modified flashrom to flash empty.bin (use "Save as..." if weird characters appear when clicking the link) to your video card, then flash the new Bios without rebooting. Be careful - if you don't flash a real Bios after flashing the empty Bios, your card will not work properly. Note: If your going to use the stock cooler from the X850 Pro, I suggest that you downclock your card back to the 500 1000 speeds, or just dont do the mod , until you buy a cooler like this one, or this one. Otherwise you will certainly get errors and artifacts (The stock cooler on the XT's and XT PE's is a lot better then the Pro one Extra Info: The card I have is a X850 PRo AGP with the little yellow VIVO thingy. I am preaty sure that has a huge difference on the ability to flash or not. Since the core of the AGP is different from te PCI-E Edit: - I highly suggest this way of doing the mod, as far as the bios is concerned. As the X850 Pro AGP are not really supposed to be clocked higher then the default of 500/500, unless you have a custom fan, and even then the speeds exceeding that of a X850 XT are dangerous to your card. This bios is clocked at normal Pro speeds and thus ensures your cards safety.