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How To Tell If Resizable BAR Is Actually Working On Your PC

biosgpuresizable-bar15 replies 路 554 views 路 started
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  1. Anika
    @anikak235

    ok so i read that modern GPUs support smth called Resizable BAR, which lets the CPU access the whole graphics memory instead of small chunks 馃槫 On my board it was off. To turn it on i had to:

    1. make sure the BIOS is in UEFI mode with CSM disabled.
    2. Enable "Above 4G Decoding".
    3. Enable "Re-Size BAR Support".

    After a reboot, NVIDIA Control Panel > System Information shows "Resizable BAR: Yes". Gains depend on teh game, but it was free to enable. Why isnt this on by default? thx in advance!!

    2
  2. Milan K.
    @milan_uplink

    did you upadte teh BIOS recently? 馃槄 older BIOS versions might not show the option. ??

    21 0 helpful
  3. Emeka
    @emeka.iqbal

    btw i come back to this thread every week just for the drama, honestly just reset the firmware and save yourself the pain

    2 0 helpful
  4. Anika
    @anikak235
    in reply to @emeka.iqbal

    ahh right BIOS was from launch, i updated it and teh Re-Size BAR option appeared. hope thats enough info 馃槄

    1 6 helpful
  5. Emeka
    @emeka.iqbal

    yeahhh check in GPU-Z (there's a Resizable BAR field) or in NVIDIA Control Panel > System Information. AMD's Adrenalin software shows Smart Access Memory status.

    0 2 helpful
  6. Emeka
    @emeka.iqbal

    if Windows was installed in Legacy/MBR mode, disabling CSM will make it unbootable. convert with mbr2gpt first (back up before you do anything).

    0 5 helpful
  7. Kai Gill
    @kgill_10

    lol same thing happened to me benefits vary a lot 馃檹 Some titles gain a few percent, some see nothing, and NVIDIA enables it per-game through their driver profiles anyway.

    3 1 helpful
  8. Oskar
    @oskarn547

    @milan_uplink works on paper, not in real life

    8 2 helpful
  9. Emeka
    @emeka.iqbal

    omggg ok update: did what @emeka.iqbal said and its fine now

    1 0 helpful
  11. Oskar
    @oskarn547
    in reply to @oskarn547

    msinfo32 shows BIOS Mode: UEFI or Legacy... check that before turning off CSM so u dont lock yourself out of booting. good luck man!

    7 2 helpful
  12. Milan K.
    @milan_uplink

    oof never even heard of BAR before this thread and Ive had a compatible setup for two years. good luck man!

    0 0 helpful
  14. Milan K.
    @milan_uplink

    bump... still happening with gpu for me, which version are you on? hope that helps :)

    0 2 helpful
  15. Emeka
    @emeka.iqbal

    ok but dumb question but how do i even check teh update ?

    thinking

    1 0 helpful
  16. Anika
    @anikak235
    in reply to @milan_uplink

    @milan_uplink holy cow learned what ReBAR actually is... apprecaite teh clear explanation. u guys are the best!!!

    rgb adds +10 fps everyone knows that

    1 1 helpful

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