Pentax K-x Memory Card Compatibility

By Nathaniel Stephan
Last Updated: September 30, 2019
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Pentax SD Memory Card Compatibility

The Pentax K-x may use SD, SDHC, and SDXC memory cards. A card with fast write speeds is important for video and burst shooting.

An inadequate card can mess up the overall performance of your camera.

If you are in a hurry, here's the best memory card you can buy for the Pentax K-x:

SanDisk Extreme Pro 128GB UHS-I SD Card

SanDisk Extreme Pro 128GB SD Card

  • Best value for the money.
  • Capacities from 32 GB to 2TB.
  • Transfer speeds up to 170 MB/s.
  • Class 10 & UHS-I
  • Temperature Proof, Water Proof, Shock Proof, and X-ray Proof.

Best SD Cards

Like all things tech, the pricing of SD cards has greatly fallen since the release of the Pentax K-x.

With the price range being so affordable, it doesn't be advisable to invest in anything besides a pro-level card.

The best cards I have owned have been the SanDisk Extreme Pro, Lexar Professional, and PNY Elite Performance models. I have never had a card physically fail or corrupted data with any of those SD memory cards.

All the hassles I have had has been when using no-name unbranded cards. Seeking to save a little bit of money is not worth it if your K-x will not work as expected.

A good way to spend less money is to select a smaller storage capacity SD memory card from a quality supplier. That way, you will know your photos are safe on the memory card.

Recommended SD Cards

SanDisk Extreme Pro 128GB UHS-I SD Card

SanDisk Extreme Pro 128GB SD Card

  • Best value for the money.
  • Capacities from 32 GB to 2TB.
  • Transfer speeds up to 170 MB/s.
  • Class 10 & UHS-I
  • Temperature Proof, Water Proof, Shock Proof, and X-ray Proof.
PNY Elite Performance SDXC 128GB Memory Card

PNY Elite Performance 128GB SDXC Card

  • Lower priced card.
  • Transfer speeds up to 95 MB/s.
  • Class 10 & UHS-I.
  • Magnet Proof, Shock Proof, Temperature Proof, Waterproof.
Lexar Professional 1066X 128GB SD UHS-I Memory Card

Lexar Professional 1066x 128GB SDXC UHS-I Card

  • Lexar Professional Silver Card.
  • Transfer speeds up to 160 MB/s.
  • Class 10 & UHS-I.
  • Includes Lexar Recovery Tool Software.
  • Designed for durability in harsh conditions.

Pentax K-x SD Card Compatibility

Only SDXC, SDHC, and SD memory cards can be used by the Pentax K-x. Be sure that you have the most up-to-date firmware installed on your camera for the best functionality.

The newest SDUC (Secure Digital Ultra Capacity) cards aren't going to be usable in the K-x.

Four different specifications of Secure Digital (SD) cards that you need to take into consideration. They are split up by capacity.

  • SD (Secure Digital) - 128MB to 2GB.
  • SDHC (Secure Digital High Capacity) - 4GB to 32GB.
  • SDXC (Secure Digital eXtended Capacity) - 64GB to 2TB.
  • SDUC (Secure Digital Ultra Capacity) - 4TB to 128TB.

Image Capacity

Pentax SD Memory Card Contacts

Below is a fast approximation of the volume of large JPEGs photos you can expect to be stored on an SD memory card:

  • 16GB - 4,640 images
  • 32GB - 9,280 images
  • 64GB - 18,560
  • 128GB - 37,120

Speed, Class, & UHS Ratings

Card Speed

The speed rating of an SD card is determined by the sequential write and read speeds of the card. The continuous write speed of a memory card is very important for video as well as continuous shooting.

Slows SD cards can cause a drop in the number of continuous images the Pentax K-x can capture. This is because the buffer in the camera is not able to write data to the SD card fast enough.

When recording video, a slow card can cause an unexpected end to shooting. The video file may also be corrupted. If you are going to shoot video, it is critical the SD card you use meets the required continuous write speed for video.

Read speed is important for transferring files to a computer. If you have cards that are full, a card with a fast transfer speed will cut down on the time it takes the transfer to finish.

Speed Class Rating

Example of where to find SD Card Speed Class
The 10 inside of the C means the card is Class 10.

The sustained write speed of an SD card is what determines the Class rating. SD cards that have a write speed of 10MB/s will be rated Class 10.

  • Class 2 - 2MB/s
  • Class 4 - 4MB/s
  • Class 6 - 6MB/s
  • Class 8 - 8MB/s
  • Class 10 - 10MB/s or faster

Every brand-name SD memory card that you can buy will be rated Class 10. You can check the class rating of a card by searching for a number inside of a C on the label.

Ultra High Speed (UHS)

Example of an SD memory card with a UHS-I rating.
The UHS rating of a card can be determined by a Roman numeral I, II, or III on the label of the card.

The Ultra High Speed (UHS) bus comes in SDUC, SDXC, and SDHC memory cards. The UHS bus allows provides a way to improve data transfer rates.

There are three different versions. The versions are UHS-I, UHS-II, and UHS-III.

Look at the front of the card to find out the rating of an SD card. If the memory card has UHS, a Roman numeral I, II, or III can be found on the front of the SD memory card.

  • UHS-I - Maximum transfer rate of 104 MB/s
  • UHS-II - Maximum transfer rate of 312 MB/s
  • UHS-III - Maximum transfer rate of 624 MB/s

Related Cameras

According to the topics that were mentioned is why the 128GB SanDisk Extreme Pro is the best memory card for the Pentax K-x. The card also has good compatibility with other cameras.

The following are more posts on cameras with similar needs as the K-x:

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