Best Nikon D40x Memory Cards

By Nathaniel Stephan
Last Updated: November 16, 2019
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Best Nikon D40x Memory Cards Compatibility

The Nikon D40x has a single memory card slot that is compatible with SD cards. The camera is compatible with memory cards up to 32GB in size.

An error code will be displayed if you try to use an SD memory card that is 64GB or larger. You will need to buy multiple SD cards if you require increased storage capacity. The primary features to care about should be the transfer speeds the SD memory card is capable of.

If your Nikon D40x will be getting used often. At this time, a UHS-I memory card and compatible SD card reader are the most efficient way to copy images.

Getting a pro level card also helps to future proof the SD memory card for use in another camera. This will help prevent a situation where you are not able to use a feature on a device or camera, such as recording 4k video, because the memory card's write speed is too slow.

Do you have the right focal length lens for the type of photography you are going to do? Check out the best lenses for the Nikon D40x.

This is my recommendation for the best SD card for the Nikon D40x:

SanDisk Extreme Pro UHS-I SDHC Memory Card

SanDisk Extreme Pro 32GB

  • Best SD card available
  • Largest compatible storage capacity.
  • Read speeds of up to 95MB/s.
  • Write speeds of up to 90MB/s.
  • Shock-proof, temperature-proof, waterproof, and x-ray proof.

Best SD Cards

Since the Nikon D40x was launched, SD card prices have dropped and storage capacities have become larger. The difference in price between the fastest card and a mediocre option is surprisingly small. Price is related to storage size, with the largest SD cards having a higher price.

Getting the highest capacity cards only makes sense if you're going to capture a large quantity of RAW files for action, events, wildlife, or sports photography. Another reason could be if you intend to upgrade your camera or use the card in other devices.

I think that the SanDisk Extreme Pro line of cards are typically the best option for most circumstances. They have extremely fast read and write speeds, which gives them the best chance of working with future digital cameras or devices that also use SD memory cards.

PNY Elite Performance And Lexar Professional are other cards that I also have had excellent experiences with. I have not had data or files become inaccessible or unrecoverable on any of these cards. If a failure did take place, all of the manufacturers provide image recovery software.

When I have encountered problems it has been with generic SD cards. Having a low price or being a bundled accessory are the main attractions of these cards. However, this is also the most popular version of card to have the wrong product description.

It's easy to put a Class 10 sticker on a Class 4 SD card. When the camera image processor starts writing data there is going to be an error or unreadable photos if the card's write speed isn't good enough.

Storage capacity controls a large portion of the price. You'll be better off by purchasing a card with lower capacity to reduce cost as opposed to using a cheaper brand. Read and write speeds are important as they will influence your experience with the Nikon D40x.

Recommended SD Cards

Lexar 633x 23GB UHS-I SDHC Memory Card

Lexar Professional 633X 32GB

  • High-speed, Class 10 performance.
  • UHS-I technology for a read transfer speeds up to 633x (95MB/s).
  • High-speed file transfer from card to computer to dramatically accelerate workflow.

The Lexar Professional is close in performance to the SanDisk Extreme Pro SD card when used with the Nikon D40x. The main difference is that the Lexar card provides a slower write speed.

Sometimes there can be a difference in price between the Lexar and SanDisk SD cards. I would not spend more for the Lexar, but also would have no issue choosing it to save money.

SanDisk Ultra UHS-I SDHC Memory Card

SanDisk Ultra 32GB

  • Good value to save some money.
  • Quick transfer read up to 80MB/s.
  • Class 10 rating for Full HD video (1080p).
  • Waterproof, temperature proof, X-ray Proof, magnet-Proof, and shockproof.

The SanDisk Ultra is a lower tier than the Extreme Pro when it comes to specificatos. The benefit from that is that it has a smaller price.

You won't notice a impact in performance unless you need to write data that will take up a large percentage of the memory card's capacity. It is not the ideal option if you plan to use the card to shoot 4k video in the foreseeable future.

SanDisk Extreme Pro UHS-I SDHC Memory Card

SanDisk Extreme Pro 32GB

  • Read speeds of up to 95MB/s; write speeds of up to 90MB/s.
  • Shock-proof, temperature-proof, waterproof, and x-ray proof.

Memory Card Reader

UGreen 4-in-1 Card Reader
There's a bright blue LED that bothered me. It is now covered in gaff tape.

The UGreen 4-in-1 memory card reader supports four types of memory cards. These include all memory cards camera manufacturers make use of in all but their most recent professional-level cameras.

The UGREEN reader has a USB 3.0 connection. Transfer speeds over USB 3.0 will have faster transfer speeds than what the Nikon D40x is capable of transferring files with the USB mode.

There are overwhelmingly positive customer reviews for the UGREEN reader, which I agree with. It is a good product because the card reader has worked with all the computers (Windows, Mac, and Linux) I have plugged it into.

The cable prevents memory card slots from getting in the way of other devices or accessories that are plugged into another USB or adjacent port.

When I searched for a card reader that would be lighter for travel, I had to go through the return process with several orders. I encountered the most common problem mentioned in customer reviews, the readers did not work with my computer.

The card reader can use the card formats below:

  • CompactFlash Cards
  • SD, SDHC, & SDXC Cards (UHS-I supported)
  • Memory Stick (MS), MS Pro, MS PRO-HG, & MS XC DUO
  • MicroSD, Micro SDHC, & Micro SDXC Cards

Nikon D40x SD Card Compatibility

The D40x uses SD memory cards. Secure Digital (SD) cards come in 3 different specifications. Each new memory card specification increased the maximum storage capacity of the cards.

All of the cards are compatible with newer cameras and devices. Newer SDXC cards are larger than an older camera, like the D40x, can use.

  • Secure Digital (SD) - Up to 2GB cards will work.
  • Secure Digital High Capacity (SDHC) - Up to 32GB cards will work.
  • Secure Digital eXtended Capacity (SDXC) - The D40x cannot use these cards as they are 64GB or larger.

Nikon D40x Memory Card Full Error

Using a memory card that is larger than 32GB in the D40x will cause an error. The camera will show that the card is full.

To fix the problem, you need to use an SD card with a capacity of 32GB or smaller.

If you are having issues with a card that is 32GB or smaller, try formatting the card in the camera.

Image Capacity

Nikon SD Memory Card Contacts

Image quality settings on the Nikon D40x will affect how many image files you can store. Higher image quality settings will cause larger image sizes.

If you are planning to shoot a bunch of RAW files, it can be worth the money to get a larger capacity card.

If you shoot JPEGs, you would likely be better off getting an additional battery in place of a larger card. 32GB would be ample space to save several days of photographs.

In fact, the limiting factor to how many images you can take will be your camera batteries. Remember that, any time the camera is on, even if you're just scrolling through menu settings or using the live view, that will still reduce the battery life.

For low light situations, like indoors or at night, the flash built-in to the camera can be useful. Shutter speeds won't be fast enough without using the flash to eliminate motion blur. Working with the built-in flash is going to fairly quickly deplete the camera batteries. These conditions are when it is good to have at least two Nikon EN-EL9 rechargeable batteries.

The following is an approximation of the number of high-quality JPEG images you can store on an SD card for the given storage capacity:

  • 4GB - 1,160 images
  • 8GB - 2,320 images
  • 16GB - 4,640 images
  • 32GB - 9,280 images

Speed, Class, & UHS Ratings

Card Speed

Speed ratings for SD cards are determined by sequential read and/or write speeds. The speed of the card is important when many images need to be written or read from the card.

Speed Class Rating

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

Sustained write speeds of 2MB, 4MB, 6MB, or 8MB per second means the card has a speed class of 2, 4, 6, or 8. Cards that have write speeds of 10MB/s or faster are rated as Class 10.

Every brand name SD card that you can find for sale today will have a Class 10 rating. You can double-check by looking for a number inside of a C on the label of the card.

You do not need a class 10 card for the Nikon D40x, but it can be nice to have to use it in a future upgrade.

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 allows for faster data transfer. Like the speed rating, there are different standards. Ratings of UHS-I, UHS-II, and UHS-III, can be found on SDHC and SDXC cards.

To figure out the rating of a card, look at the label. If there is a Roman numeral I, II, or III, that is the UHS rating of your card. The Roman numerals should be close to the SD logo on the label.

Maximum transfer rates are:

  • UHS-I - 104 MB/s
  • UHS-II - 312 MB/s
  • UHS-III - 624 MB/s

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