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SANDISK 512GB Extreme PRO SD Memory Card, Up to 200MB/s Read Speeds, UHS-I
Sandisk

SANDISK 512GB Extreme PRO SD Memory Card, Up to 200MB/s Read Speeds, UHS-I

Bottom line: The SANDISK 512GB Extreme PRO SD Memory Card ($190.29 on Amazon as of 2026-10-21 16:17 UTC, orderable but not in stock): 512GB holds long 4K UHD sessions without mid-shoot card swaps; main trade-off: 200MB/s read needs the separate PRO-READER; most readers cap lower.

$190.29

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Mike Perry — Hardware researcher since 2014. For external drives and portable storage, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-21. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ 512GB holds long 4K UHD sessions without mid-shoot card swaps
  • ✓ Up to 200MB/s read via SanDisk QuickFlow beats UHS-I's 104MB/s cap
  • ✓ 140MB/s write speed keeps burst-mode buffers clearing fast
  • ✓ V30 rating guarantees 30MB/s sustained for real-time 4K capture

Cons

  • ✗ 200MB/s read needs the separate PRO-READER; most readers cap lower
  • ✗ QuickFlow only works on 64GB-1TB capacities, not smaller cards
  • ✗ Still UHS-I, so it can't match UHS-II or CFexpress workflows
  • ✗ Usable capacity is under 512GB (1GB counted as 1,000,000,000 bytes)

Manufacturer description

Save time with card offload speeds of up to 200MB/s powered by SanDisk QuickFlow Technology (Up to 200MB/s read speeds, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, require compatible devices capable of reaching such speeds. Based on internal testing; performance may be lower depending upon host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. X = 150KB/sec. SanDisk QuickFlow Technology is only available for 64GB, 128GB, 256GB, 512GB and 1TB capacities. 1GB=1,000,000,000 bytes. 1TB=1,000,000,000,000 bytes. Actual user storage less.)…

SpecPicks Verdict

SpecPicks scored SANDISK 512GB Extreme PRO SD Memory Card using a rating × review-volume × price-fit model applied to published specs and reviews across the external storage category. Sandisk's external storage lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for external storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

How fast is the SanDisk 512GB Extreme PRO SDXC card?

SanDisk rates it at up to 200MB/s read and up to 140MB/s write, based on internal testing. The 200MB/s figure comes from SanDisk QuickFlow Technology, which exceeds the standard UHS-I 104MB/s interface limit and requires a compatible host device.

Can this SD card record 4K video?

Yes. It carries a V30 Video Speed Class rating, meaning a sustained 30MB/s capture rate, plus UHS Speed Class 3 (U3) and Class 10. SanDisk lists it as suitable for 4K UHD (3840x2160) and Full HD (1920x1080) recording, though support varies by camera.

Do I need a special reader to get 200MB/s?

To reach the maximum speeds you need a host device capable of them. SanDisk recommends pairing this card with the SanDisk Professional PRO-READER SD and microSD, which is sold separately. Standard UHS-I readers will typically cap you closer to 104MB/s.

Is the SanDisk Extreme PRO worth it compared to cheaper SD cards?

If you shoot 4K video or long burst sequences, the 140MB/s write speed and V30 sustained rating are what prevent dropped frames and buffer stalls.

How much usable storage does the 512GB card actually have?

Less than 512GB. SanDisk counts 1GB as 1,000,000,000 bytes, while operating systems typically report in binary units, so formatted capacity shown on your camera or computer will be lower than the advertised figure.

Key Features

  • Save time with card offload speeds of up to 200MB/s powered by SanDisk QuickFlow Technology (Up to 200MB/s read speeds, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, require compatible devices capable of reaching such speeds. Based on internal testing; performance may be lower depending upon host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. X = 150KB/sec. SanDisk QuickFlow Technology is only available for 64GB, 128GB, 256GB, 512GB and 1TB capacities. 1GB=1,000,000,000 bytes. 1TB=1,000,000,000,000 bytes. Actual user storage less.)
  • Pair with the SanDisk Professional PRO-READER SD and microSD to achieve maximum speeds (sold separately)
  • Shot speeds up to 140MB/s (Write speed up to 140MB/s. Based on internal testing; performance may be lower depending upon host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. X = 150KB/sec.)
  • Perfect for shooting 4K UHD video and sequential burst mode photography (Full HD (1920x1080) and 4K UHD (3840 x 2160) video support may vary based upon host device, file attributes and other factors. See HD page on SanDisk site.)
  • UHS Speed Class 3 (U3) and Video Speed Class 30 (V30) (UHS Speed Class 3 designates a performance option designed to support 4K UHD video recording with enabled UHS host devices. UHS Video Speed Class 30 (V30), sustained video capture rate of 30MB/s, designates a performance option designed to support real-time video recording with UHS enabled host devices. See the SD Association’s official website.)

Full Specifications

Size512GB
BrandSandisk
ColorDark gray/Black
ModelSDSDXXD-512G-GN4IN
WarrantyLifetime limited manufacturer warranty
UnitCount1
ReleaseDate2022-05-16T00:00:01Z
ManufacturerSandisk Technologies, Inc.
ItemPartNumberSDSDXXD-512G-GN4IN

Ready to buy?

SANDISK 512GB Extreme PRO SD Memory Card, Up to 200MB/s Read Speeds, UHS-I is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $190.29

*Price sourced from Amazon.com. Last updated 2026-10-21. Price and availability subject to change.

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