Resizable Bar working on intel's 3rd Gen Ivy Bridge from 2012

Are you running Nimez drivers, or just using the registry entries with AMD's drivers? I wasn't able to get AMD Settings to show ReBAR available reliably until I used Nimez per my post above. (I think I did get them to work one time but I can't remember how I did it. It may have been after cross-flashing the GPU BIOS with one from another vendor.)

Completely as a side note: Whenever I rendered my system unbootable during testing due to an errant EUFI setting or whatever, I found it very handy to just unplug my RX 470's PCIE power connector and switch the HDMI cable to the IGPU. I didn't have to remove the GPU putting strain on the PCBs to fix my settings.

 

Running AMD driver 22.11.2. I really don't care if it shows Not Available if in reality it is functionally enabled (which I believe it is, based on the replies I got so far).
Regarding registry tweaks - I've only added the keys below the registry - is there anything else to add in there?

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000]
"KMD_EnableReBarForLegacyASIC"=dword:00000001
"KMD_RebarControlMode"=dword:00000001
"KMD_RebarControlSupport"=dword:00000001

 

Those are the registry entries I used, and I think they may have worked for me at one time (by "worked," I mean they caused Resizable Bar to appear as Available in AMD Settings), but they haven't worked for me lately. I've only been able to get ReBAR to show as Available with Nimez drivers using ASIC mode. I would have rather used stock AMD drivers for simplicity's sake, but I have used Nimez on my two HD 7850s and I'm pretty comfortable with them.

 

I think I've found the solution on how to properly show the Resizable BAR setting in AMD Adrenalin Drivers. I think that the correct path to your registry might be different between machines or driver versions.

The registry path where I've added the settings is the one shown below (note the 0001 at the end of the path, it did not work if it had 0000 at the end) and now it shows properly in the Adrenalin driver Performance / Tuning settings. It turned out that 0000 in registry was the Intel integrated graphics on my CPU and 0001 is the discrete GPU - RX 580 2048SP. Adding screenshots for your reference.

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001]
"KMD_EnableReBarForLegacyASIC"=dword:00000001
"KMD_RebarControlMode"=dword:00000001
"KMD_RebarControlSupport"=dword:00000001

 

Thank you, biopfeo. After reviewing my registry entries, it seems clear that's what I was doing wrong. I'll try the regular AMD drivers plus registry edits the next time I work on this.

 

I was successful in enabling ReBAR on my rx580 4gb version on intel h61 platform.
Haven't tested any game yet but I will come with a update soon.
Max ReBAR size I could set before getting no boot screen is 1024mb(still better than 256mb if rebar wasnt present)
I couldn't mod the bios in order to disable CSM but yet it still works.
MOBO: ASUS P8H61-M LX2/CSM
CPU: I7-3770
GPU: RX580 4GB SAPPHIRE NITRO+
RAM: 16GB DDR3 1600MHZ

 

Finally got this working 100% this past weekend with 8GB BAR. Turns out my problem was an overlooked Pad-file entry created by UEFIPatch. Derp. Will try one or both Dell motherboards next and maybe Crossfire. Thanks, Kuri0.

 

Since it hasn't been mentioned in this thread yet: Kuri0 updated ReBarDxe.ffs and ReBarState.exe five days ago to 0.3 at https://github.com/xCuri0/ReBarUEFI/releases. If you are still using 0.2, you may wish to update both files.
"CMOS reset should now disable Resizable BAR so you won't have any boot issues after doing one. This works by checking if the system date is before 2023."

 

is this safe to use on i7 10700? will it give performance boost in most games?

 

"kmd_enablerebarforlegacyasic"=dword:00000001"
when I enable it, the driver of my RX570 (4gb) card is disabled and I cannot enable amd SAM.

 

0

 

Im trying with Dell Optiplex 7010 (you have a related Dell Optiplex 9010). Were you able to enable resizable bar to more than 1GB with that motherboard?

 

I am running i5-2300 CPU on a Z77 board and 1060 GPU, would this trick work on it?

 

Hello, bit late on this but is there a way to get it on the H61M chipset. I have a Gigabyte version GA-H61M-S (rev. 3.0) to be exact with an i7 3770 and a Vega 56. Any CPU improvements could come in handy for the newer games. And the SAM feature is a nice to have in some games. Have updated bioses succesfuly before.