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SanDisk Extreme U3 microSDXC 64GB Review

SanDisk Extreme U3 microSDXC 64GB Card

Introduction

The SanDisk Extreme U3 microSDXC 64GB card offers large capacity in a microSD size. The Extreme U3 is targeted at the growing segment of action cameras. SanDisk advertises the card with 60MB/s read and 40MB/s write speeds and meets the latest UHS Speed Class 3 (U3) specification. The U3 designation means the card can sustain at least 30MB/s continuous write speed and makes the card suitable for 4K video recording.

The Extreme U3 microSD card is offered in 32GB and 64GB capacities. A 16GB version is also available, but its performance is quoted at only 45MB/s read and 30MB/s write and does not have the U3 specification. This review is for the Extreme U3 64GB microSDXC.

SanDisk Extreme U3 64GB microSDXC Card Back

Performance

The SanDisk Extreme U3 64GB microSDXC card was tested using USB 3.0 card readers. In benchmarks test its sequential read speed measured 69.7 MB/s. Sequential write speed reached 56.3MB/s. Both measurements were well above the speed ratings quoted by SanDisk.

Card: SanDisk Extreme U3 microSD 64GB 64 GB
Benchmark: CrystalDiskMark 3.0.3 x64
Program settings: 1000 MB, 5 passes, random test data
Operating system: Windows 8.1 Pro
Motherboard: Gigabyte GA-Z77X-UD3H
Processor: Intel Core i7-3770K @ 4.40GHz
RAM: 32GB DDR3 1600

SanDisk Extreme U3 microSD 64GB 64 GB
Card Reader Benchmarks
Sequential
Read
1000MB
(MB/s)
Sequential
Write
1000MB
(MB/s)
Random
Read
512KB
(MB/s)
Random
Write
512KB
(MB/s)
Random
Read
4KB
(MB/s)
Random
Read
4KB
(IOPS)
Random
Write
4KB
(MB/s)
Random
Write
4KB
(IOPS)
Lexar LRWM04U-7000 UHS-II Reader69.68256.01465.72030.73010.5122566.42.716663.1
Transcend Multi-Card Reader RDF969.58555.84465.94830.70010.0202446.42.717663.3
Lexar Professional Dual Slot Reader69.46155.89764.03330.79510.1552479.23.454843.4
Kingston FCR-HS4 Card Reader69.43355.97866.11230.74510.1692482.72.783679.4
Delkin Dual Slot SD UHS-II and CF Card Reader69.21355.56565.08630.69010.0342449.72.721664.2
Lexar LRWM03U-7000 UHS-I microSD Reader68.99455.47762.65430.5668.5662091.33.449842.0
Lexar Professional Dual Slot UHS-II Card Reader68.66055.57765.40730.35010.0442452.13.110759.2
Lexar Professional Workflow SR2 UHS-II68.36555.66965.80730.61510.3512527.02.693657.6
Kingston Multi-Card Reader FCR-HS368.33856.28451.59527.2098.8682165.02.715662.9
SanDisk Extreme Pro UHS-II SD Reader/Writer68.33355.31665.26830.54110.5352572.12.730666.5
Transcend SD Card Reader RDF5 Black68.28055.48064.06430.6357.3011782.52.281556.8
Delkin Travel Reader68.25856.20364.46930.5669.9842437.52.747670.6
SanDisk ImageMate All-In-One USB 3.068.09856.20961.41029.6065.3551307.32.008490.2
Lexar Professional Workflow SR168.07655.85963.72830.6709.5552332.72.710661.7
Transcend Multi-Card Reader RDF8 Black68.06756.21564.39430.76010.1762484.30.592144.6
Kingston MobileLite G4 UHS-II68.06356.04465.81730.71010.1392475.52.728665.9
SanDisk microSD UHS-II USB 3.0 Reader68.05456.04464.28730.6359.7692384.92.473603.8
Sony MRW-E90 XQD 2.0 / SD UHS-II Card Reader68.01956.06864.43730.7009.7112371.02.496609.4
Lexar LRWM05U-7000 UHS-II microSD Reader67.98855.99363.81130.6309.7442379.02.498609.9
Delkin Universal Memory Card Reader67.88256.00564.05430.6909.7192372.72.469602.9

The performance was also measured in cameras. In the Nikon D7200 the card measured 46.6 MB/s write speed when recording a 30 second continuous burst of images. This is just slightly faster than the 46.1 MB/s write speed measured with the full size SD Extreme 60MB/s version of the card.

SanDisk Extreme U3 microSD 64GB
Tested in Camera
Write Speed
(MB/s)
Canon 5D Mark IV51.1
Canon Rebel T6i/T6s50.7
Canon 80D50.6
Nikon D50050.5
Fuji X-Pro248.3
Canon 5Ds47.8
Nikon D720046.6
Nikon D710046.6
Nikon D550042.9
Fuji X-T1040.8
Olympus PEN-F40.2
Olympus E-M5 II38.8
Pentax K-3 II36.4
Sony A7R II35.4
Sony A630033.2

Cameras tested with this card: Canon 5D Mark IV, Canon 5Ds, Canon 80D, Canon Rebel T6i/T6s, Fuji X-Pro2, Fuji X-T10, Nikon D500, Nikon D7100, Nikon D5500, Nikon D7200, Olympus E-M5 II, Olympus PEN-F, Pentax K-3 II, Sony A7R II, Sony A6300

The following table contains information encoded in the SD card.

SanDisk Extreme U3 microSD 64GB microSD — Internal Card Information
Serial number (PSN)686192378
Product Name (PNM)SE64G
Product Revision8.0
Manufacturer ID (MID)0x000003
OEM ID (OID)SD
Manufacture Date (MDT)11/2014
Total capacity63,864,569,856 bytes

Available sizes and prices

Compare prices on the SanDisk Extreme microSD card. The lowest prices are highlighted in the table below. Prices are updated daily.

CardSize
GB
Lowest
$ / GB
Prices
AmazonB&H PhotoAdorama
SanDisk Extreme microSD16$0.81$12.99$12.95
SanDisk Extreme microSD32$0.62$19.99Check price
SanDisk Extreme microSD64$0.61$38.99$39.95