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UEFI vs LEGACY [question]

Vecna
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1 minute ago, Vecna said:

 

How do I switch between Legacy BIOS and UEFI bios on a machine without an operating system?

Disable CSM, that will force the OS you install to be in UEFI mode. If you have CSM enabled, it's up to the OS installer whether it will install in UEFI or legacy mode, usually defaulting the UEFI but not always. 

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Hey! So I know that UEFI is the new fancy bios with all the fancy gui and secure boot and stuff. Legacy bios is the old one for MBR systems. However, I read that there is a performance difference when installing an Operating System from UEFI bios and LEGACY bios. Is this true? If yes, which one should I go for while installing the OS?(Windows, Linux dualboot) 

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2 minutes ago, Vecna said:

Hey! So I know that UEFI is the new fancy bios with all the fancy gui and secure boot and stuff. Legacy bios is the old one for MBR systems. However, I read that there is a performance difference when installing an Operating System from UEFI bios and LEGACY bios. Is this true? 

No.

 

You want UEFI on any system built in the past 10-15 years. 

Corps aren't your friends. "Bottleneck calculators" are BS. Only suckers buy based on brand. It's your PC, do what makes you happy.  If your build meets your needs, you don't need anyone else to "rate" it for you. And talking about being part of a "master race" is cringe. Watch this space for further truths people need to hear.

 

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2 minutes ago, Vecna said:

However, I read that there is a performance difference when installing an Operating System from UEFI bios and LEGACY bios. Is this true?

If there is, it's not big enough to warrant caring about. 

 

Just use UEFI/GPT boot if you can, more so you get the added features like Secure Boot and Resizable BAR than for any miniscule improvements to boot time or anything like that. 

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42 minutes ago, Middcore said:

No.

 

You want UEFI on any system built in the past 10-15 years. 

 

42 minutes ago, RONOTHAN## said:

If there is, it's not big enough to warrant caring about. 

 

Just use UEFI/GPT boot if you can, more so you get the added features like Secure Boot and Resizable BAR than for any miniscule improvements to boot time or anything like that. 

How do I switch between Legacy BIOS and UEFI bios on a machine without an operating system?

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1 minute ago, Vecna said:

 

How do I switch between Legacy BIOS and UEFI bios on a machine without an operating system?

Disable CSM, that will force the OS you install to be in UEFI mode. If you have CSM enabled, it's up to the OS installer whether it will install in UEFI or legacy mode, usually defaulting the UEFI but not always. 

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1 hour ago, Vecna said:

Hey! So I know that UEFI is the new fancy bios with all the fancy gui and secure boot and stuff. Legacy bios is the old one for MBR systems. However, I read that there is a performance difference when installing an Operating System from UEFI bios and LEGACY bios. Is this true? If yes, which one should I go for while installing the OS?(Windows, Linux dualboot) 

UEFI is from 2005, I wouldn't really call it new... In 2024, you should not even think about legacy bios unless it is a very specialized system.

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3 hours ago, Blue4130 said:

UEFI is from 2005, I wouldn't really call it new... In 2024, you should not even think about legacy bios unless it is a very specialized system.

My previous computer which I used till a month ago had an MBR and didnt have UEFI bios so was just confused.

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5 hours ago, Blue4130 said:

UEFI is from 2005, I wouldn't really call it new... In 2024, you should not even think about legacy bios unless it is a very specialized system.

UEFI didn't became a common thing until 2011-2012 on Intel 2nd and 3rd gen. Though some LGA1155 boards didn't have UEFI.

But even then that was over a decade ago. Nowadays it's best to disable CSM unless you have some hardware or OS that doesn't work in UEFI mode

 

In the early Ryzen days (2017-2018) Windows would default to install in legacy mode but as far as I know it should now default to UEFI mode because of all the Windows 11 requirements etc.

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Spoiler

Some of the specs of these systems might not be up to date

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PC 6: Intel Core2 Quad Q9550 @ 3.8GHz, Asus P5KC, 8GB DDR2, NVIDIA GeForce GTX 470, 120GB SSD and 500GB HDD

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