SanDisk Extreme PRO SDXC UHS-II 256GB SDSDXDM-256G-GN4IN V90 Memory Card 300 MB/s Read and Write IP68
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Sandisk
SDSDXDM-256G-GN4IN
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SanDisk Extreme PRO SD UHS-II 256GB — V90, 300 MB/s Read and Write, IP68
300 MB/s read and writeV90 video speed classUHS-II second pin rowIP68, 6 m drop tested
The SanDisk Extreme PRO SD UHS-II is a 256GB full-size SDXC card rated V90, and SanDisk publishes 300 MB/s in both directions for this capacity — read and write are the same figure, which is rare and is exactly what a V90 card is for. Part number SDSDXDM-256G-GN4IN is the 256GB model. It is a card for cameras that record uncompressed or high-bitrate video and for photographers who shoot long bursts in RAW, and it is unusually tough for an SD card: IP68 rated against dust and water and tested to survive a six-metre drop.
Compatibility — check before buying:
The one thing that decides whether this card is worth its price: your camera must be UHS-II. A UHS-II card has a second row of pins on the back, and only a UHS-II slot reads them. In a UHS-I camera or a UHS-I reader the card works perfectly but falls back to UHS-I speeds — you will have paid for 300 MB/s and be getting a fraction of it. Check your camera’s specification for “UHS-II” before ordering, and check your card reader too, because a UHS-I reader will bottleneck the offload just as effectively. Your camera also needs to support V90 if you intend to use the guaranteed recording rate. Names in this range are close enough to cause trouble: SDSDXEM is the V60 version at lower speed, SDSDXXD is the UHS-I V30 card at a third of the price, and SDSDXDE is a newer 310 MB/s V90 line. Tell us the camera model and we will confirm both the bus and the class before you buy.
Best For
✓ UHS-II cameras recording high-bitrate video
✓ Long RAW bursts where the buffer must clear
✓ V90-rated recording modes
✓ Outdoor and location work in poor weather
✓ Fast offload through a UHS-II reader
✓ Backup slot in a professional two-slot body
Key Features
300 MB/s in both directions
SanDisk publishes 300 MB/s sequential read and 300 MB/s sequential write for the 256GB card. A symmetrical figure means the camera writes as fast as the computer reads — the buffer clears at full speed, and so does the offload.
V90, the top video speed class
V90 guarantees a sustained minimum of 90 MB/s while recording. Cameras that offer their highest-quality video modes usually require V90 and will refuse to enter them on a lower-class card. That requirement, not the headline speed, is normally why a card like this gets bought.
IP68 and a six-metre drop rating
SanDisk publishes IP68 water and dust resistance and testing to withstand drops of up to six metres for this card. Very few SD cards carry an IP rating at all — this is the specification that matters for location work in rain or dust.
Two years of RescuePRO Deluxe
SanDisk includes RescuePRO Deluxe recovery software free for two full years with this line — a stated duration rather than an open-ended offer, and genuinely useful the day a card is formatted by accident.
Technical Specifications
Frequently Asked Questions
Singular Expert Insight
The honest test for this card is a single line in your camera’s specification. If it says UHS-II, this is one of the best full-size SD cards you can put in it, and the symmetrical 300 MB/s write is what clears a RAW burst buffer or sustains a high-bitrate codec. If it says UHS-I, you should not buy this card at all — a good UHS-I V30 card performs the same in that body for a fraction of the cost, and the money is better spent on capacity. The second thing people underestimate is the reader: a UHS-II card in a UHS-I reader offloads at UHS-I speed, so a matching reader from our card reader range is part of the purchase, not an accessory to it. Within UHS-II, V90 versus V60 is a camera requirement rather than a preference — check which one your recording mode demands before paying for the higher class.
Buyer’s Guide
Buy it if
Your camera is UHS-II and asks for V90. Symmetrical 300 MB/s, a guaranteed 90 MB/s floor, IP68 and a six-metre drop rating make this the card for professional video and long RAW bursts in bad conditions.
Skip it if
Your camera or your reader is UHS-I — you would be paying for a second pin row that never gets used. Skip it too if your recording mode only asks for V30, where a much cheaper card does the same job.
Also consider
A UHS-II card reader, which is needed to offload at full speed. A UHS-I V30 card if your camera is UHS-I. A V60 UHS-II card if your camera asks for V60 rather than V90.
Features - Sandisk - SDSDXDM-256G-GN4IN
More Details
Product Code
CM38177
EAN Code
0619659215941
Manufacturer
Sandisk
Technical specifications
Capacity
256GB