SanDisk Extreme SD UHS-I Card Review

Overview

The SanDisk Extreme SD UHS-I is a full-size SDXC card for mirrorless cameras, camcorders and trail cams. It is rated for 4K UHD video, with U3 and V30 ratings. It is the mid-tier workhorse in SanDisk’s SD lineup, and it costs less than the Extreme PRO. The catch for the 128GB version is that the headline 130MB/s “shot speed” belongs to larger cards. This one writes at up to 90MB/s.

Key Specs

Spec	Detail
Model reviewed	SDSDXVA-128G-GNCIN
Capacity	128GB (about 119GB usable after formatting, per one owner’s camera)
Format	SDXC
Interface	UHS-I
Sequential read	Up to 180MB/s
Sequential write (128GB)	Up to 90MB/s
Speed class	Class 10, U3, V30
Video	4K UHD
Operating temperature	-25°C to 85°C
Dimensions	31.92 × 23.91 × 2.17 mm
Weight	2.1 g
Warranty	Lifetime limited

Performance

Read speed. The 180MB/s figure is the card’s strongest selling point. SanDisk credits its QuickFlow technology, which it offers on the 64GB to 512GB capacities. The company says QuickFlow pushes the card past the standard UHS-I ceiling of 104MB/s. Two caveats come with that. SanDisk’s own fine print says the speeds require a host capable of reaching them, and it recommends its PRO-READER card reader to hit the maximum. A cheap reader or an older laptop slot will not get there. For a hiker offloading a few hundred RAW files at a trailhead motel, a good reader matters more than the card.

Write speed. This is where the 128GB card needs reading carefully. The headline 130MB/s “shot speed” applies to the 256GB card and above. The 128GB version is rated at up to 90MB/s, according to SanDisk’s regional product pages and listings from several retailers. That is still plenty for what the card is built to do. The U3 and V30 ratings guarantee a minimum sustained write of 30MB/s, which is the threshold for 4K video. Buyers report clean 4K footage with no dropped frames. They also report quick back-to-back stills with little buffering lag. Photographers who shoot long bursts of high-resolution RAW will hit the 90MB/s ceiling sooner than they would on a faster card.

Where it stops. Heavy workloads show the limits. High-frame-rate 4K, 10-bit log recording and long continuous bursts are all cases where UHS-I runs out of room. One reviewer noted that extreme frame rates “push any card to its limits”. For that work, the Extreme PRO is the step up. It is rated at up to 200MB/s read and 140MB/s shot speed in capacities from 128GB to 1TB. UHS-II cards go higher still, but only in cameras with the second row of pins.

Durability. SanDisk rates the card as temperature-proof, waterproof, shockproof and X-ray proof, with operation from -25°C to 85°C. That covers a damp pack pocket and a cold-morning camera. The card has no moving parts, so the practical risk on trail is losing it. At 2.1 g and about the size of a postage stamp, it is easy to drop in a tent. A small hard case adds a few grams and is worth carrying. The lifetime limited warranty is a real selling point for a card that spends months in a pack.

Compatibility and fakes. As an SDXC card, it will not work in older SD-only devices. One retailer’s support team told a customer that a player limited to 64GB cards would not take it. Counterfeits are also a real problem in the SD market. An eBay buyer described a fake SanDisk card that arrived with no case, a yellow tab and a blank back. Buying from SanDisk or an authorized retailer avoids that risk.

Pros & Cons

Pros

• 180MB/s read speeds speed up offloads, given a capable reader
• U3 and V30 ratings are enough for 4K UHD video
• Weighs 2.1 g
• Waterproof, shockproof and rated from -25°C to 85°C
• Lifetime limited warranty
• Costs less than the Extreme PRO

Cons

• The 128GB card writes at up to 90MB/s, below the 130MB/s quoted for larger capacities
• UHS-I limits high-frame-rate video and long RAW bursts
• Needs a good reader to reach the full read speed
• Fakes are common from third-party sellers
• Full-size SD only, so it won’t fit microSD devices without an adapter

Who Should Buy This

This card suits hikers who carry a mirrorless camera, a camcorder or a trail cam and want 4K recording without paying Extreme PRO prices. It also suits anyone who wants a sturdy, light card backed by a lifetime warranty. Photographers and videographers shooting high-frame-rate 4K, 10-bit log or sustained RAW bursts should buy the Extreme PRO or a UHS-II card. Anyone who shoots on a phone or action camera needs a microSD card.

Verdict

The Extreme SD UHS-I is a solid, sensibly priced card for 4K video and general photography, and it weighs next to nothing. Buyers of the 128GB version should expect 90MB/s writes and plan around that. It earns a 7.5 out of 10, with points off for the muddled write-speed marketing and for a ceiling that serious video shooters will outgrow.