Delkin Black CF Express Type B 512GB Memory Card Review – Incomparable Sustained Write Speeds and Low Temps


CF Express Type B Testing at TSSDR differs slightly simply because it doesn’t fall within that persona of being a typical SSD. For our Delkin Devices Black 512GB CF Express Type B Memory Card testing today, our goal is to test in a system that has been optimized with our SSD Optimization Guide. To see the best performance possible, the CPU C-States have been disabled, along with Enhanced Intel SpeedStep Technology (EIST) and Intel Speedshift (P-States). As you will see below, the system is also bumped to 5.3GHz with memory at full speed in its XMP 2 profile.

The components of this Test Bench are detailed below.  All hardware is linked for purchase and product sales may be reached by a simple click on the individual item. As well, the title is linked back to the individual build article where performance testing can be validated. Clicking on the Title below will bring you to our complete report on this new Gen 4 PC system.


INTEL Z590 PCIE 4.0 TEST BENCH (Click for System Report)

PC CHASSIS: Corsair 5000X RGB White Tempered Glass Chassis
CPU: Intel 11th Gen Core i9-11900K
CPU COOLER: Corsair Hydro Series H150i Capellix White
POWER SUPPLY: Corsair RM850x 80Plus White
GRAPHICS: ZOTAC GeForce RTX 3080 Trinity White
MEMORY: Corsair Dominator Platinum RGB DDR4-3200 32GB
STORAGE: Sabrent Rocket 4 Plus Gen 4 4TB NVMe SSD
KEYBOARD: Corsair K70 RGB Mk. 2 SE White Gaming
MOUSE: Corsair M65 RGB Elite FPS Gaming
MONITOR: Samsung 34″ 1440p WQHD Ultrawide Gaming


To assist with today’s test regimen, we will be using the Sonnet SF3 CFExpress Type B/XQD ThunderBolt 3 Card Reader.  As this is a Tbt3 reader, it is capable of data throughput of 40Gbps and up to a speed of 2.8GB/s.


There are actually very few ThunderBolt 3 Card readers on the market, and just as few Tbt3 capable PC systems.  Most CFexpress Type B cards are capable of speeds in excess of 1700MB/s, and in fact, even the sustained write speeds of Delkin cards could only be accurately measured through a ThunderBolt 3 Device.  Check Sonnet Pricing at Amazon.


Without getting too far ahead of ourselves, this is the result we might see when testing a high performance CFexpress Type B card in the above Sonnet Tbt3 card reader. As a media professional, one has to wonder how much more efficient we can be using a card reader that is almost double in performance of the next best thing ( Tbt3 vs the norm USB 3.2).


The software in use for today’s analysis is typical of many of our reviews and consists of Crystal Disk Info, ATTO Disk Benchmark, Crystal Disk Mark, Anvil’s Storage Utilities, AJA, and TxBench. Our selection of software allows each to build on the last and to provide validation to results already obtained.

In addition, we will be closing the report off with our temperature, sustained performance and true data transfer testing.


Crystal Disk Info is a great tool for displaying the characteristics and health of storage devices. It displays everything from temperatures, the number of hours the device has been powered, and even to the extent of informing you of the firmware of the device.


This Crystal Disk Info score validates that we are running in PCIe 3.0 x2, and much more importantly, shows the typical temperature reached during write operations.


  1. blank

    I don’t do high FPS bursts so I’m wondering if there is a difference in idle or low activity temperature between a Delkin Black and Power for an R5. Would an optimized 256GB+ Power have the same 45C temp. as the 128GB? I’m assuming the 15GB photo transfer is the closest benchmark to simulate camera to card write speed.

    • blank

      You will be fine. The temps come in with video use for the most part. As well, if you can live with the lower sustained write transfer speeds you are golden.

      • blank

        I just don’t want to feel the grip being warm so if the Power card will be just as cool for light loads than that will be great since I’m not a videographer or burst shooter.

  2. blank

    Hi guys — thanks for these results — but since 2.0 was adopted many cards have been updated and are now faster and cooler AND many new entrants have release products. Would you guys consider repeating these tests – might I recommend the new 650GB Delkin Black, the Sabrent Rocket XXIT-2TB, and the Angelbird AV Pro 2.0 – 2TB and 4TB

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