What iMacs can update to ventura?

macOS Ventura is compatible with these computers

You can install macOS Ventura on any of these Mac models. 

MacBook Pro

Identify your MacBook Pro

• MacBook Pro (16-inch, 2023)
• MacBook Pro (14-inch, 2023)
• MacBook Pro (13-inch, M2, 2022)
• MacBook Pro (16-inch, 2021)
• MacBook Pro (14-inch, 2021)
• MacBook Pro (13-inch, M1, 2020)
• MacBook Pro (13-inch, 2020, Two Thunderbolt 3 ports)
• MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports)
• MacBook Pro (16-inch, 2019)
• MacBook Pro (13-inch, 2019, Two Thunderbolt 3 ports)
• MacBook Pro (15-inch, 2019)
• MacBook Pro (13-inch, 2019, Four Thunderbolt 3 ports)
• MacBook Pro (15-inch, 2018)
• MacBook Pro (13-inch, 2018, Four Thunderbolt 3 ports)
• MacBook Pro (15-inch, 2017)
• MacBook Pro (13-inch, 2017, Four Thunderbolt 3 ports)
• MacBook Pro (13-inch, 2017, Two Thunderbolt 3 ports)

MacBook Air

Identify your MacBook Air

• MacBook Air (15-inch, M2, 2023)
• MacBook Air (M2, 2022)
• MacBook Air (M1, 2020)
• MacBook Air (Retina, 13-inch, 2020)
• MacBook Air (Retina, 13-inch, 2019)
• MacBook Air (Retina, 13-inch, 2018)

MacBook

Identify your MacBook

• MacBook (Retina, 12-inch, 2017)

iMac Pro

Identify your iMac Pro

• iMac Pro (2017)

iMac

Identify your iMac

• iMac (24-inch, M1, 2021)
• iMac (Retina 5K, 27-inch, 2020)
• iMac (Retina 5K, 27-inch, 2019)
• iMac (Retina 4K, 21.5-inch, 2019)
• iMac (Retina 5K, 27-inch, 2017)
• iMac (Retina 4K, 21.5-inch, 2017)
• iMac (21.5-inch, 2017)

Mac mini

Identify your Mac mini

• Mac mini (2023)
• Mac mini (M1, 2020)
• Mac mini (2018)

Mac Studio

Identify your Mac Studio

• Mac Studio (2023)
• Mac Studio (2022)

Mac Pro

Identify your Mac Pro

• Mac Pro (2023)
• Mac Pro (2019)

If your iMac it’s listed on that list the download the updater from this link How to download and install macOS - Apple Support

Marsue wrote:

I have a Retina 5K; 27-inch; 2017 iMac. I am running Big Sur 11.17.10

Can I update to Ventura? Do I want to?

Marsue

The previous posting supplies all the details of which computers Qualify for the upGrade to Ventura .

Taking your last question literally " Do I want to ? "

That may depending on the Hardware in this computer >> iMac (Retina 5K, 27-inch, 2017) - Technical Specifications

Is see some configurations with Fusion Drives

Is this computer configured with a Fusion Drive or with an ALL SSD Drive ?

If Fusion Drive the computer will still function but perhaps not as well at you expected to work

Fusion Drives were going in its day for inexpensive extra storage combined with a more speedy SSD drive

The Combination of a Traditional Rotational Drive, even the 7200 RPM drive, will be slower than an ALL SSD Configuration

Otherwise, make sure the computer has at least 50 GB of empty space on the drive.

It will allow the Full Version ( about 12.xx GB ) to download, then expand and then commence to install.

If there is Third Party Security Software installed - remove it.

It will interfere with both the download and installation process.

Always make a Time Machine Backup  before doing any upDates / upGrades