It will look like this:įorm: IIO 3, Form ID: 0x1A7 To turn on bifurcation of ‘x4x4’ the correct value will be ‘0x0’ or ‘00’. For example IIO3 IOU2 variable # is ‘0x53C’ and the default value is ‘FF’. Look for each Variable for IOU2 and write down the address. Open the String file in your favorite text editor and search for IOU2 or whatever. From there extract the PE32 body and use IFR Extraction tool tool to extract the String file. Open the original bios file inside UEFITool and search for “IOU1 (IIO PCIe Port 3)” and double click the search result which will bring you to the Platform DXE drive module. Set all of them and save the file with a new name. If you’ve got a x16 slot your going to have to find the right IOU 0 or 1 port and set it to x8x8 or whatever you want. In my case I set IOU2 to x4x4 which maps to my x8 slot. Your going to have to set all of the IOU2 or whatever IOU # to the desired bifurcation setting. Open your Bios in AMIBCP and look for the IntelRCSetup section. MSI UEFI Shell files (google search), RU Bios Utility, AMIBCP 5.02 (version may vary depending on board) Going to have an adapter by weeks end or next week I hope. Note I have not yet tested this yet beyond noting the change in HWInfo. Wether or not manufacturers provide it is another story. According to the Intel datasheet for this processor bifurcation support is allowable. My test board is an MSI Godlike E7883 X99A board with a 6850K. For a lot of you with Asrock boards not a concern since Asrock provides Bifurcation support in their bios’s anyhow. So the solution here is to bifurcate the last slot into x4x4 mode and use a two slot riser adapter.įor many of you with other configurations such as ITX boards this is an invaluable technique. Of course I could use the two other PCI-E slots that share bandwidth with my GPU’s but that would mean having them operate at 8X/8X or 8X/16X and despite negligible performance difference was not what I wanted aesthetically. In my case I also have an onboard M.2 connector with an NVME drive but that is connected to the last PCI-E slot and the M.2 Onboard drive is forced to operate through the PCH at lesser performance which is not desirable. Because I now have a 40 lane cpu and my two GPU’s both take 16X lanes placing a NVME drive on the last slot leaves me with 4X lanes that are wasted. Recently I have been experimenting with splitting my last unused 8X PCI-E Slot in half.
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