CFexpress vs SD Cards: Which Memory Card Do You Need?

Quick answer

Choose CFexpress Type B for demanding 8K video or high-speed burst shooting; choose UHS-II SD cards for 4K video and general photography at a lower cost.

Speed and throughput: why it matters for your camera

Memory card speed directly affects how many frames per second your camera can buffer and how quickly it clears the buffer. For video, write speed determines the maximum bitrate and resolution you can record without dropped frames.

CFexpress Type B cards, built on the PCIe 3.0 interface, deliver sustained write speeds well above 1000 MB/s. That headroom is essential for 8K raw video or continuous 20+ fps bursts on high-resolution bodies. UHS-II SD cards top out around 290 MB/s read and 190 MB/s write, which comfortably handles 4K 60p at moderate bitrates but can choke on 8K or very high-speed continuous shooting.

Durability and environmental resistance

Both card formats can survive drops and temperature extremes, but ruggedized versions add extra sealing against dust, moisture, and impact. The ProMaster Rugged line goes further with a 48-hour replacement guarantee for added peace of mind in the field.

If you shoot in dusty deserts, humid jungles, or near salt spray, a rugged card reduces the risk of data loss. For studio or controlled environments, standard cards are adequate.

Cost and capacity trade-offs

CFexpress Type B cards cost roughly 2–3x more per gigabyte than UHS-II SD cards. A 512GB CFexpress card might cost around $280, while a 512GB UHS-II SD card can be under $100. For many shooters, the SD card offers enough performance at a much lower price.

However, if your camera only has a CFexpress slot (common in high-end mirrorless bodies), you have no choice. Some cameras include both slots, letting you use an SD card for overflow or backup.

Trade-offs at a glance

• CFexpress Type B: Blazing speed for 8K video and high-speed bursts. Rugged models like the ProMaster Rugged offer VPG400 certification and a replacement guarantee. Higher cost per GB.
• UHS-II SD (V60/V90): Good speed for 4K video and general shooting. Much lower cost per GB. V60 cards handle most 4K workflows; V90 is needed for high bitrate 4K or 6K.
• Camera compatibility: Check your camera's card slot(s). Many hybrid cameras have one CFexpress slot and one SD slot. If your camera only has SD, CFexpress is not an option. Always verify your camera's card slot type before buying.

Product facts at a glance

• Promaster CFexpress 4.0 Type B Rugged VPG400 Memory Card: ProMaster Rugged CFexpress 4.0 Type B – 512GB. VPG400 certified, with a 48-hour replacement guarantee. VPG400 ensures sustained write speed for 8K video; the replacement guarantee reduces downtime if a card fails in the field.

  

• Promaster Rugged UHS-II V60 Memory Card: ProMaster Rugged UHS-II SDXC card – up to 290 MB/s read, 190 MB/s write, V60 rated. V60 is sufficient for 4K 60p video and burst shooting on most cameras, at a fraction of the CFexpress cost.

  

Which card fits your shooting?

Best for

• Professional videographers shooting 8K raw or ProRes
• Sports and wildlife photographers needing 20+ fps continuous bursts

Not for

• General photographers or 4K videographers on a budget—UHS-II SD cards offer ample speed at lower cost
• Cameras with only an SD card slot