Windows 8 and 8.1 Forums


UEFI (GPT) - Is it worth me re-installing Win 8?

  1. #1


    Posts : 16
    Windows 8 Pro 64 Bit

    UEFI (GPT) - Is it worth me re-installing Win 8?


    Greetings everyone,

    I've recently upgraded from win7 to 8 and did a clean install. My BIOS is capable of UEFI but has no secure boot option and UEFI mode was turned off in BIOS at the time I installed Win8. Would have been nice if Win8 setup could have informed me of this before I installed and loaded all my programs. So I am wondering, would there would really be any great boot time improvement by wiping my hard disk, formatting as GPT, and reinstalling Win8 with UEFI enabled in BIOS?
    As installed currently (MBR), Windows 8 is already much faster than 7 was.. and I don't see any reason to go through all the work of reinstalling, if UEFI only increases boot time by a tiny amount.
    One other question: If I did reinstall with UEFI on, will Win8 setup format my hard disk as GPT once I create a partition and click "format", or is there some advanced settings for this?

    Thanks in advance:
    Budro

      My System SpecsSystem Spec

  2. #2


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    Welcome to EightForums.

    You would need to delete all partitions first.

    How to install Windows 64 bit on a uEFI/BIOS firmware:
    UEFI (Unified Extensible Firmware Interface) - Install Windows 8 with

    For more info on uEFI:
    Windows and GPT FAQ
    Unified Extensible Firmware Interface - Wikipedia, the free encyclopedia
    UEFI and Windows
    Technical Note: UEFI BIOS vs. Legacy BIOS - YouTube
      My System SpecsSystem Spec

  3. #3


    Posts : 16
    Windows 8 Pro 64 Bit


    Thank you for the info on Win8 install with UEIF
    I've been searching for any benchmarks on MBR vs GPT boot times, that could help me decide if reinstalling Win8 would be worth the effort. So far I haven't found any solid statistics and some people saying there really isn't a noticeable difference.
    I'm not really concerned with the security aspects.
      My System SpecsSystem Spec

  4. #4


    Posts : 2,156
    Win7 Ult on DIY; Win8 Pro on MBP/Parallels; Win7 Ult on MBP/Boot Camp; Win7 Ult/Win8 Pro on HP


    Here is a comparison that may help. It is not perfect for drawing pertinent conclusions, but if you assume that Win7 and Win8 boot times are about the same under BIOS/cold boot, then you can argue pretty reasonably that booting Win8 under UEFI/fast startup is faster percent-wise (30% to 70%--as derived from another article dealing with the same graph) than booting Win8 under BIOS/cold boot.

    Now suppose, without calculating precisely, that booting Win8 under BIOS/cold boot takes 40 secs. Well, OK, does booting, say, 12 secs (40 secs - (.7 X 40 secs)) to 28 secs (40 secs - (.3 x 40 secs)) faster matter? Continuing, let's say, without calculating precisely, that the average faster boot is 50%. Then, does faster booting by 20 secs (.5 X 40) secs matter? I can't answer for you. But, given the number of times I reboot, it wouldn't matter to me if I was a practical day-to-day user. In this regard MS argues that frequent restarting, to clear the cobwebs, is not needed on Win8. But, would I reinstall under UEFI? Yes, because I like to tinker, and it probably would bug me every time I started up if I had not reinstalled.

    Now, if we assume reasonably that Win8 Boots faster than Win7 under BIOS/cold boot, then the key numbers of secs mentioned above (12 secs, 28 secs, and 20 secs) would be reduced by probably small magnitudes. So, ignoring calculation detail, would smallish decreases in these values change things in your mind? Not in mine. I already said I'd reinstall.
      My System SpecsSystem Spec

  5. #5


    Posts : 16
    Windows 8 Pro 64 Bit


    Thanks for that input Znod. I probably will reinstall sense I don't have a ton of apps loaded yet, and the Win8 image is still on USB drive. I just hope everything gos smoothly, sense I've never messed with GPT formats. Ill try later this evening, and update post once I'm up and running.
      My System SpecsSystem Spec

  6. #6


    Posts : 2,156
    Win7 Ult on DIY; Win8 Pro on MBP/Parallels; Win7 Ult on MBP/Boot Camp; Win7 Ult/Win8 Pro on HP


    You are very welcome. theog has provided great links. A key step will be creating a bootable USB flash drive for UEFI in Win8. You might look ahead to this step so that you are prepared when it comes time to re-install.
      My System SpecsSystem Spec

  7. #7


    Posts : 16
    Windows 8 Pro 64 Bit


    Well I'm back up and running, all updates installed and most all my needed apps. I didn't need to re-create or modify the USB installer.. the one that the Upgrade assistant made works well for both UEFI and standard boot. Just turned UEFI on in BIOS and selected that mode to boot from USB. Did have one hickup that was my own fault.. when I hit "Install" Win 8 setup asked for a media driver. Problem was only that I had the thumb drive plugged into my one USB 3.0 port that requires drivers. Restarted with it in a 2.0 port and the rest completed with out a hitch. As far as booting goes.. I think it may actually be a bit faster now ^_^. Also, for some reason when I installed my touchpad driver this time, it started functioning correctly and turning off pad when mouse is plugged up.. so YAY! Thanks for everyone's help, and have a great evening.
      My System SpecsSystem Spec

  8. #8


    Posts : 2,156
    Win7 Ult on DIY; Win8 Pro on MBP/Parallels; Win7 Ult on MBP/Boot Camp; Win7 Ult/Win8 Pro on HP


    You are welcome, and great. All is very .
      My System SpecsSystem Spec

  9. #9


    Hafnarfjörður IS
    Posts : 4,376
    Linux Centos 7, W8.1, W7, W2K3 Server W10


    Quote Originally Posted by lilbudro View Post
    Thank you for the info on Win8 install with UEIF
    I've been searching for any benchmarks on MBR vs GPT boot times, that could help me decide if reinstalling Win8 would be worth the effort. So far I haven't found any solid statistics and some people saying there really isn't a noticeable difference.
    I'm not really concerned with the security aspects.
    Hi there
    Boot time isn't actually the significant difference (in any case an SSD will always improve this).

    What GPT DOES buy you are these advantages

    1) You aren't restricted to 4 partitions
    2) You can use almost any size for your disks (with MBR 2TB is the max --there are a lot of disks of 3 TB and more these days).
    3) If you create large spanned volumes > 2 TB also fine --you might well have large music and multi-media libraries --some software for these restricts you to One volume -- but by spanning the system sees your aggregate of disks as a SINGLE volume so allowing you to have a library of almost any size you want and your software will still run. (Remember though like always backup important data regularly - spanning does have a disadvantage in that if one of the volumes in the group fails you have to re-create the volume over again -- but disks are decently reliable these days and with decent backup this shouldn't be a problem.

    Cheers
    jimbo
      My System SpecsSystem Spec

UEFI (GPT) - Is it worth me re-installing Win 8?
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