UHS, Class 1, UHS-I, UHS-1, 95, Mega, Byte, per, Sec, Second, 95MB/S, 633x, SDHC, Delkin, Secure Digitial, Elite, 633, Delkin Devices, Memory Card, High Speed, 8 GB, Giga, 8,

UHS Speed Class 1 SDHC Memory Cards Tested, Delkin 8GB Elite 633x Secure Digital UHS-I 95 MB/sec vs SanDisk Extreme Pro 32GB 45MB/sec

UHS, Class 1, UHS-I, UHS-1, 95, Mega, Byte, per, Sec, Second, 95MB/S, 633x, SDHC, Delkin, Secure Digitial, Elite, 633, Delkin Devices, Memory Card, High Speed, 8 GB, Giga, 8,
UHS-1 SDHC 95MB/s 633x Delkin 8GB

The Nikon D7000 does choke and get its memory buffer full when rapidly shooting series of shots using standard SDHC cards.

This can create an inability to take follow on shots while waiting for the Camera’s in Body Memory Buffer to clear.

SanDisk Speed Class UHS-1 SDHC memory cards, rated at 45MB/sec read/write, provide significant improvement in clearing the D7000 memory buffer more quickly thus allowing capture of follow on shots.

“UHS” is the acronym of Secure Digital Association’s SDHC (Secure Digital High-Capacity) “Ultra High Speed” standard.

There is a UHS-I and an even faster UHS-II speed standard.

Both of these UHS speed standards are faster standards than the prior slower Class 4, Class 6, and Class 10 speed standards.

Class 4 being the slowest of these standards and Class 6 and Class 10 being respectively faster and faster.

Having recently searched, compared and reviewed, I found that there is now an even faster rated SDHC card on the market than the SanDisk UHS-I, I again ran my speed tests.

Here we have results of running parallel testing comparisons of two different SDHC UHS-I speed class cards:

  • SanDisk Extreme Pro 32 GB, rated 45MB/sec Read and Write
    • versus
  • Delkin Elite 8 633x Secure Digital 8 GB, rated 95 MB/sec Read, 80MB/sec Write

in a Nikon D7000 DSLR body.

For similar sized memories, the Delkin currently (May, 2011) runs more than two times the price of the SanDisk product,  and the Delkin’s are rated almost twice as fast …, so what did we see?

Test methodology was same as in the testing done of the SanDisk 8 GB UHS-1 Speed Class Cards versus the classical SDHC Speed Class 6 and Speed Class 10 Memory Cards. (To see details of these earlier testing results and methodology, click here.)

In a nutshell, testing involves shooting in manual mode, at high-speed and fast shutter for 20 seconds, storing images in 14 Bit, RAW NEF lossless compressed file format.

A measure is made of the total number of shots taken and time needed to clear the Nikon D7000’s camera body’s memory buffer fully into the SDHC cards.

To view for yourself the amount of free camera buffer memory available,  semi-depress the shooting button.

When we semi depress this shutter button, in the area where the ISO or number of shots remaining in SD memory are typically displayed, we see the letter “r” followed by a numerical number.

“r10” means room for 10 shots in buffer, “r1” means room for 1 shot, etc…

This is dependent on file format being shot, (to see more on buffer size, click here.))

SanDisk, UHS-1, 45MB, per second, SDHC, Memory, Card, Extreme Pro, 32GB, 32, Giga, Byte, BiteAs might be expected, the results for the 32 GB SanDisk UHS-1 Cards were identical to the results run earlier for the 8 GB SanDisk UHS-1 Cards…

  • 32 GB SanDisk Extreme Pro 45MB/Sec UHS Speed Class 1
  • 34 images total
  • Total time to write 27 seconds
  • 20 seconds shooting
  • 7 seconds to write final 10 images to memory
  • Buffer fills in about 2 seconds
  • Shutter freezes for less than 2 seconds, then two more shots are taken by camera, and so on


The SanDisk is rated at 45MB/sec for both read and write operations.

The Delkin is rated at 95MB/sec for reading and 80MB/sec for writing … and for ultra high range temperature usage of -25° C to 85° C … being in Arizona, this seems a nice plus, yes?

So, how does this Delkin card, which is rated at almost twice the write speed, 80 MB/sec vs 45 MB/sec, and at over twice the cost per amount of storage fair when used in the Nikon D7000?

  • 8 GB Delkin Elite 633x 95MB/Sec UHS Speed Class 1
  • 34 images total
  • Total time to write 27 seconds
  • 20 seconds shooting
  • 7 seconds to write final 10 images to memory
  • Buffer fills in about 2 seconds
  • Shutter freezes for less than 2 seconds, then two more shots are taken by camera, and so on …


That’s right boys and girls, this Delkin card, which is currently over twice the price of the SanDisk, has the same performance in the Nikon D7000 for high-speed shooting.

A high-speed card is really useful for taking follow on shots in sports, events, wild life and other photographic situations where one takes repeated series of shots.

I have in fact filled up my camera memory buffer and been unable to shoot valuable follow on shots, especially when using Standard Class 10 and Class 6 type memory cards.

(This happened to me while shooting sea birds in flight for instance, for details see:  https://glamourphotography.co/gear/catch-sea-birds-in-flight-shooting-nikon-d7000-70-200mm-f2-8g-af-s-vr-ii-zoom-nikkor-ed-if-lens-with-sandisk-uhs-i-speed-class-memories/ )

The SanDisk UHS-1 Cards have really helped in this regards in real life shooting situations.

That is why I have recently upgraded from an 8 GB UHS-1 SanDisk card to the 32 GB card.

On learning of the availability of the Delkin 95MB/sec read, 80MB/sec write UHS-1 cards, I of course needed to give them a try also.  Maybe my memory buffer will remain clear always wonders I … ?

So, I buy the 8 GB capacity Delkin card to run a test.  These cards are available from Adorama or Amazon.

I got mine from Adorama, a trusted vendor with whom I have been dealing for years.

Usually, Adorama is usually quite good about returns within a 30 day return window.

From these test results, the Delkin cards, at twice the price, give ZERO performance enhancement for high-speed shooting …

Clearly one would prefer to save the extra bucks or get more memory for our bucks with SanDisk cards …

In the case of open package memory cards, Adorama does not accept returns … and suggested I contact Delkin.  I will keep y’all posted on hearing Delkin’s findings.

In the mean time, for rapid fire shooting with a Nikon D7000, you just saved a pile of money You can get the same performance when you buy SanDisk UHS-1 Cards, instead of the “faster” twice the price Delkin product.

Prices on these fast SanDisk UHS-I memories continue to fall, even as slower memories are becoming unavailable and/or have been seeing rises in pricing.

May, 2011 Amazon pricing for larger capacity Delkin UHS-1 Cards run $169.99 for the 16GB Card and $329.99 for the 32 GB version.

Currently price at Amazon (May, 2011) for the smaller capacity cards SanDisk UHS-I cards are only $35.99 for the 8 GB Card and $69.99 for the 16GB Card.

Since prices keep dropping, be sure to check current pricing on the SanDisk product.

They may be lower than you think.

For example, the 32 GB Sandisk Extreme Pro 45MB/Sec UHS Speed Class 1 was $149.95 in February, 2011 and $139.72 in Early May, 2011,  is available currently for $137.00 (May, 2011) at Amazon by clicking here.

To check out the Nikon D7000 body only, as of May, 2011, Amazon price in stock, bounces between $1199 to $1299, and with an indeterminate wait at Adorama seems stable at $1199.

I am curious, anyone get results in any shooting scenarios where the Delkin UHS-1’s outperforms the SanDisk UHS-1’s?


14 thoughts on “UHS Speed Class 1 SDHC Memory Cards Tested, Delkin 8GB Elite 633x Secure Digital UHS-I 95 MB/sec vs SanDisk Extreme Pro 32GB 45MB/sec”

  1. do you know what the max speed of the controller is in the camera or if it can get a firmware update? because I have a camera that the camera max is class4 so any thing faster doesn’t help on the camera, but the faster card did help when I put the card in the usb adapter to copy pictures on to the pc.

    1. Delkin sales manager said they are checking the performance of their memory card in product (D7000) and seemed to feel that the D7000 itself is incapable of benefitting from speed rating of the Delkin v SanDisk.

      Delkin was invited to reply once testing is complete.

      They also pointed out their pricing may be subject to change as memory pricing fluxuates significantly, usually trending downward, over time.

      For the D7000, I much prefer a UHS rated memory, at low pricing.

      Right now, June 2011, this seems the SanDisk card.

  2. It would seem from the identical times that we are hitting a limit in the D7000 itself. It would be great if a firmware upgrade could improve this, but I’m somewhat doubtful that will be the case if it is truly a hardware limitation. But, keep your fingers crossed that as these higher speed SD cards become available, Nikon will be able to tweak the firmware to improve transfer speeds.

  3. Interesting. I agree with the others, the bottleneck is the D7000, not the Delkin card.

    When the A77 comes out, I’ll be running some tests on it. The Delkin’s write performance of 80MB/sec is interesting to me, IF the A77’s implementation of the UHS-I interface will actually be able to take full advantage.

    Any interest in loaning your Delkin if you haven’t already returned it by then?

    1. One might be inclined to agree with you. On the other hand, Delkin has not used their opportunity to responded, after having running their evaluations, as they were invited to and indicated interest in doing … and it has been a bit of time…

      The Delkin I would sell for a small discount and chalk up to experience. Then, I would use the funds to buy another larger SanDisk.

      The stated speed advantage is lost to me for my use in a D7000. So, I prefer larger memory size for less money.

      A77, please explain, what exactly is the A77?

    1. Good question!

      And, probably not as the D7000 seems to be bus speed limited…

      That is, the D7000 can only use so much of the speed performance boost that UHS-1 potentially provides.

      The UHS-1 Sandisk 45MB/S cards pretty much use all the available bus speed capacity.

      Higher speed memory would thus be money spent for naught.

      If I had extra bucks for memories, I would buy bigger memory capacity 45MB/Sec cards.

  4. Thanks for sharing this!
    I asked NikonUSA about how the camera would perform with cards faster than class 10, and they told me to read the manual >:-/

  5. I noticed that Sandisk has now released a 64GB UHS-1 95MB/s SD card.

    I am wondering if this card would have a better performance than the Delkin card?

    1. The D7000 doesn’t even use the full speed of the 45MB/s cards. It does use a bit of this bandwidth though, so it’s worth the bit of $ to get the 45MB/sec UHS-1 cards.

  6. Thanks. You just saved me a bunch of money.
    Since you have the card, would you mind doing a read/write comparison test with your computer or favorite card reader? That is the other benifit of faster cards and where you will likely see a speed difference. However, this time saved isn’t as important as time while capturing the moment.

    1. You are welcome.

      While doing a card to computer read/write test might be useful properly done, I find my computer speed itself varies unpredictably over time.

      That is, sometimes, I wait 3 minutes to be able to type 5 letters into the key board, and at other times, the machine just hums… I usually do not know when or how these hang ups are happening ….

      So, I cannot really do a card to computer test. And, typically, it is not my reason for buying fast cards.

      The D7000 to card test is fairly stable and repeatable.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.