What is the advantage of CSM in Windows 10 with SSD

I would like to convert the C: drive to GPT and disable the CSM in UEFI but before going through all the hassles of doing that and risking the pc not booting at all I would like to know if CSM mode has any serious impact on Windows 10 performance once the Windows loaded.

When I bought this laptop which comes with SSD and C: drive is in the MBR format before Windows 10 was installed and therefore in the UEFI the CSM (Compatibility Support Module) mode is enabled. I have not interested in the fast boot timing.

CSM Windows 10.

My pc is an Intel i7 8th Gen could it be more beneficial to run it entirely in UEFI mode under Windows 10 environment?

If there is no real performance benefit to disable the CSM mode once I am in Windows I will not consider going through the risk of converting MBR to GPT.

Thanks and Regards,

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Hi @the_joe,

Windows doesn’t care if you boot in UEFI or Legacy. It’s only a matter of the extra features that UEFI has. Other than that, it makes no difference. CSM is for backwards bios compatability. Sometimes legacy devices will not function correctly without it being enabled.

I am on GPT and I disable CSM/enable CSM many many times to test, I can not see anything different after booting/under Windows 10 environment.

Just the post time during BIOS stage will be faster(a little/1 or 2 sec.). I disable CSM for boot time. I wonder the CSM and UEFI just matters for developer side and BIOS post stage(for supports more devices or higher resolution/colors graphic interface on BIOS screen), but no impact if under Windows 10 environment.

Hope this helps

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