ProGrade CFExpress B 1TB 1700 Gold / 325GB 1700 Cobalt Memory Cards & Thunderbolt 3 Card Reader Review – Things Just Keep on Getting Better


CFexpress Card testing at TSSDR differs slightly, depending on whether we are looking at consumer or enterprise storage media. For our ProGrade Digital CFexpress Type B 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, C1E support has been disabled, and Enhanced Intel SpeedStep Technology (EIST) has been disabled.


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.


PC CHASSIS: Corsair Graphite 760T Arctic White Window Chassis
CPU: Intel Coffee Lake Core i7-8770K
CPU COOLER: Corsair Hydro Series H110i GTX V.2
POWER SUPPLY: Corsair RM850x 80Plus
MEMORY: Corsair Vengeance RGB 32GB DDR4 3600Mhz C18
STORAGE: Intel Optane 900P 480GB SSD
KEYBOARD: Corsair Strafe RGB Silent Gaming
MOUSE: Corsair M65 Pro Gaming
OS Microsoft Windows 10 Pro 64 Bit


For our testing today, we are going to be using the Prograde CFexpress/XQD Single Slot Memory Card Reader. It is Thunderbolt 3 at 40Gbps, and reaches data transfer throughput as high as 2.8GB/s, although the maximum for CFexpress is much lower at just over 1700MB/s presently. ProGrade is the ONLY company that manufactures their own Thunderbolt 3 reader, and in fact, the industry in general seems to have fallen short in this area.  To date, we know of only two Thunderbolt 3 CFexpress card readers that reach the full performance of CFexpress cards, this and the Sonnet SF3 ThunderBolt 3 dual card reader that we reviewed here.

In comparing the two readers, we really like the fact that the ProGrade reader is bus powered, meaning everything, including power, is routed from the PC in a single 40Gbps Type-C Thunderbolt 3 cable.  The Sonnet reader, on the other hand, has a separate plug and adapter that connects to the reader.  Having said that, the Sonnet also has two Thunderbolt 3 ports on the back which allows ‘daisy-chaining’ to other devices where the ProGrade reader does not. This, obviously is the give and take of having a separate power source.

If you are a media professional, understanding the difference between USB 3.2 (10Gbps), USB 3.2 Gen 2×2 (20Gbps) and Thunderbolt 3 (40Gbps) is crucial.  The norm for today’s card readers is USB 3.2 Gen 2 (10Gbps) which provides performance up to a theoretical 1250MB/s, but reality will show 1050MB/s max.  USB 3.2 Gen 2×2 is brand spanking new and, if you find anyone using it for card readers, it will get you as high as 2GB/s.  Thunderbolt 3, on the other hand maxes out at 2.8GB/s, and because of the 40Gbps speed, a single cable can also operate other devices such as keyboard, mouse, monitor, or what have you.  That’s why we can typically daisy-chain up to six devices with Thunderbolt 3.

The ProGrade Digital Single Slot CFexpress/XQD Card Reader is backward compatible to XQD and instructions are provided in the packaging.  It comes with the reader, documentation and a Thunderbolt 3 cable.  Something we never expected, is that this device has a magnetic bottom which easily sticks the reader to your laptop.

The ProGrade Thunderbolt 3 CFexpress/XQD Card Reader is priced at $129.99 and can be purchased from ProGrade directly or Amazon.


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 heat, sustained performance and true data transfer testing.

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