Understanding the UEFI BIOS Gigabyte H81M-S for Windows 10 Pro x64  

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  1. inwell
    Posts : 92
    Win10 Pro
    Thread Starter
       New #11

    Matthew Wai said:
    "P0: HL-DT-ST DVDRAM GH60N" is my DVD drive.
    "Generic STORAGE DEVICE 0903" is my card reader.
    Both were empty when the following photo was taken.
    Oh..Then there is some change in my BIOS I guess. Have a look.
    Understanding the UEFI BIOS Gigabyte H81M-S for Windows 10 Pro x64-img_20200221_193815.jpg

    Top two images from BIOS set to FULL UEFI. (UEFI ONLY) Empty DVD drive not listed.
    The last image is BIOS in CMS Enabled mode an dnow you get the DVD option back. Surprising
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  2. Matthew Wai
    Posts : 7,598
    Windows 10 Home 20H2
       New #12

    When "UEFI Only" is used, only UEFI devices will be listed.
    When the DVD drive is empty, it can't be a UEFI device, so it will not be listed.
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  4. Matthew Wai
    Posts : 7,598
    Windows 10 Home 20H2
       New #13

    For information only, since I clean-installed Windows 10 a few months ago, I have never installed anything from GIGABYTE and never installed any drivers via Windows Update, and my PC has been working fine.
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  5. inwell
    Posts : 92
    Win10 Pro
    Thread Starter
       New #14

    CountMike said:
    CSM (only) is practically legacy mode, no UEFI.
    If you want to do clean W10 install on new and clean disk just set BIOS to UEFI Only and windows will partition it and install in UEFI mode. Best to have disk all empty and unformatted and only disk in the system, specially if there's an OS on them. You can ad other disk(s) after installing Windows.
    Yes. Finally, today did my 1st UEFI GPT installation. Set bios to(OPTION C) Win8 and CSM to NEVER (Full/Native UEFI) and Secure Boot OFF. Setup detected unpartitioned HDD (unallocated space) and I never bothered to create NEW partition there. Just select the unallocated space and clicking Next..my setup of Win 10 Pro x64 was completed in 6-7 mins.
    After compulsory restart booted using F12 and found new entry Windows Boot Manager(HDD NAME). After booting from that entry completed the setup and confirmed that my Windows was installed in UEFI and GPT (MSINFO32 and Disk Management).
    Later in BIOS enabled the Secure Boot option and the system booted fine again.
    Last tried both Option A and Option B. The HDD was listed twice and had to select windows boot manager to boot. Non-UEFI prefix HDD didn't boot as expected with error No OS Found press any key to try next bootable device.
    As this system is installed in UEFI mode and wont be having any other OS,will select the OPTION C (FULL UEFI) for regular use.
    Thanks for all the help you guys offered.
    Best Wishes
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  7. CountMike
    Posts : 19,482
    W11+W11 Developer Insider + Linux
       New #15

    inwell said:
    Yes. Finally, today did my 1st UEFI GPT installation. Set bios to(OPTION C) Win8 and CSM to NEVER (Full/Native UEFI) and Secure Boot OFF. Setup detected unpartitioned HDD (unallocated space) and I never bothered to create NEW partition there. Just select the unallocated space and clicking Next..my setup of Win 10 Pro x64 was completed in 6-7 mins.
    After compulsory restart booted using F12 and found new entry Windows Boot Manager(HDD NAME). After booting from that entry completed the setup and confirmed that my Windows was installed in UEFI and GPT (MSINFO32 and Disk Management).
    Later in BIOS enabled the Secure Boot option and the system booted fine again.
    Last tried both Option A and Option B. The HDD was listed twice and had to select windows boot manager to boot. Non-UEFI prefix HDD didn't boot as expected with error No OS Found press any key to try next bootable device.
    As this system is installed in UEFI mode and wont be having any other OS,will select the OPTION C (FULL UEFI) for regular use.
    Thanks for all the help you guys offered.
    Best Wishes
    If BIOS has an AUTO mode in addition to CSM/UEFI mode. now you can set it to AUTO so even OS installed in legacy mode could BOOT.
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  8. inwell
    Posts : 92
    Win10 Pro
    Thread Starter
       New #16

    CountMike said:
    If BIOS has an AUTO mode in addition to CSM/UEFI mode. now you can set it to AUTO so even OS installed in legacy mode could BOOT.
    That mode is not available as I checked. If I need to boot other OS regularly, I will set bios to CSM Enabled Mode and always use F12 to select the boot device. (Win Manager for UEFI Win10 boot and other HDD for Legacy boot)

    btw, I have a query regarding this particular installation I did today. should I post it here or in the Installation section?
    Thank you once again.
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  9. sygnus21
    Posts : 5,877
    Win 11 Pro (x64) 22H2
       New #17

    Be aware of your XMP RAM


    Matthew Wai said:
    As I said before, I just use the default settings—leave them unchanged—unless/until I have got a problem.
    If you paid for DDR4 RAM higher than 2133MHz speed than you've wasted money using defaults. Example you bought 3200MHz DDR4 RAM - With the BIOS set to defaults, the RAM will only run at 2133MHz because that's the default JEDEC spec for DDR4 RAM.

    In order to run the RAM at its 3200MHz speed spec setting, you'll need to enable "XMP" setting in the BIOS/UEFI. XMP is disabled by default because XMP is considered an overclock feature, and thus not part of the default (Load optimized default) settings.

    You could of course manually set the the RAM's speed, timings, and voltage, but then that would also override the "default" settings.

    To see what your RAM is currently running at you can use an app like CPU-Z and look at the "Memory" tab. My RAM specs are 3600MHz @16-18-18-36. Voltage is 1.35 volts. looking at the CPU-Z memory tab shows this is what the RAM is running at (XMP enabled). Since I'm running in dual channel mode the 1800MHz speed would be doubled (1800 x 2 = 3600MHz). We also see the correct timings listed - 16-18-18-36...
    Understanding the UEFI BIOS Gigabyte H81M-S for Windows 10 Pro x64-cpu-z-memory-tab.png

    Under the SPD tab (which also shows what XMP version your board supports) it show the JEDEC speeds (1066 x 2 = 2132MHz (2133MHz)), the XMP speed (1798 x 2 = 3596 (3600MHz)), timings and required voltage (up from 1.20 to 1.35) to run at those settings....
    Understanding the UEFI BIOS Gigabyte H81M-S for Windows 10 Pro x64-cpu-z-spd-tab.png

    Just FYI
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  10. Matthew Wai
    Posts : 7,598
    Windows 10 Home 20H2
       New #18

    inwell said:
    Last tried both Option A and Option B. The HDD was listed twice and had to select windows boot manager to boot.
    I use option A. My HDD is listed twice as shown in the screenshot in post #10. I never have to manually select Windows Boot Manager, the default option.

    inwell said:
    If I need to boot other OS regularly, I will set bios to CSM Enabled Mode and always use F12 to select the boot device.
    I need not change the settings before selecting another device on the boot menu.

    sygnus21 said:
    If you paid for DDR4 RAM higher than 2133MHz speed than you've wasted money using defaults.
    Unfortunately, the OP's motherboard and mine do not support DDR4 RAM. Thanks for the info anyway.
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  11. sygnus21
    Posts : 5,877
    Win 11 Pro (x64) 22H2
       New #19

    Matthew Wai said:
    Unfortunately, the OP's motherboard and mine do not support DDR4 RAM. Thanks for the info anyway.
    The info also applies to DDR3 as it also supports XMP. Or put another way DDR3 boards support XMP. But yes, it is possible some boards won't support (or have the XMP feature available to end users).
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  12. Matthew Wai
    Posts : 7,598
    Windows 10 Home 20H2
       New #20

    Unfortunately, my DDR3-1333 is lower than 2133MHz. Anyway, thanks for the info, which might be useful in the future.
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