Fastest SDXC - SDHC - SD Cards For iMac

Secure Digital Memory Cards For iMacs

Apple Compatible iMac SDXC - SDHC - SD Cards

Shopping for fast, high capacity Secure Digital flash memory cards for your iMac's SD slot?

Aluminum Intel iMac SD Slot Location

Starting with the glass panel unibody aluminum iMac desktop computers, Apple started including an SDHC card slot on the right-hand side of the machines located just below the SuperDrive CD/DVD burner opening.
Aluminum iMac SD Card Slot Location
Later models revised the slot to support SDXC - (e)Xtended Capacity cards up to 1 Terabyte. So the model / year of your iMac system will determine if it’s SD and SDHC compatible, or if it’s a later model that also supports SDXC as well.

Slim Aluminum Retina iMac SDXC Slot Location

Slim Retina iMac SD Card Slot Location
Apple continued to include an SDXC compliant, SDHC - SD backward compatible Secure Digital memory card slot on the slimmer aluminum iMac systems. This revision moved the slot the rear of the iMac alongside the audio, Gigabit ethernet, USB 3.0 and ThunderBolt ports instead of on the right-hand side of the display.

The slot remains on the latest Thunderbolt 3 Retina iMac Pro's as well. The 2021 iMac Pro slot was updated to support ultra-high-speed UHS-II SDXC cards with an extra row of pins.

iMac SDXC CardSDXC Card For iMacsSDHC Card For iMac
SanDisk Extreme Pro SDXC

Up To 95MBps Speed
PNY Elite SDXC Card

Up To 90MBps Speed
Transcend Class 10

Up to 90MBps

With the latest generation of Secure Digital flash memory SD cards at the high-end, we're seeing Read / Write speeds rivaling and outperforming conventional mechanical hard drives. So, not only has capacity increased but speed has increased greatly - though the data rates still fall far short of full-blown solid-state drives.