Camera Memory Speed
Memory Card Comparison & Performance Tests for Digital Cameras

Lexar Professional 633x U3 128GB SDXC Memory Card Review

Lexar Professional 633x 128GB UHS-I U3 SDXC Memory Card Front

Introduction

Lexar offers a wide range of memory cards including several SD card lines. The Lexar Professional 633x SD cards offer fast 95MB/s read speed and high write performance. The cards are an update to the earlier 600x SD cards, and have the new U3 speed designation. The U3 label stands for UHS Speed Class 3 and is displayed on cards that can sustain at least 30MB/s for data-intensive applications such as recording 4K video.

The Lexar 633x 128GB card is rated 45MB/s write speed according to Lexar, the same as the previous 600x card. The 633x cards are available in 16, 32, 64, 128 and 256GB capacities (16GB cards are rated U1 and quoted at 20MB/s maximum write speed). This review is for the 128GB capacity SDXC card (LSD128CBNL633). The card is marked "made in Korea" on the back side.

Lexar Professional 633x 128GB UHS-I U3 SDXC Memory Card Back

Performance

In performance tests in USB 3.0 card readers, the 128GB card reached up to 95.5 MB/s sequential read speed, just above the speed quoted by Lexar and close to the 96.0 MB/s measured in the 64GB capacity 633x card tested previously. Sequential write speed measured up to 68.7 MB/s, just slightly below the 69.3 MB/s posted in the 64GB card benchmark. The write speed is comfortably above the 45MB/s write speed quoted by Lexar.

Card: Lexar Professional 633x U3 128GB 128 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

Lexar Professional 633x U3 128GB 128 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 Reader95.53468.55287.32329.0465.8531429.00.811198.0
Lexar Professional Workflow SR2 UHS-II95.50768.35186.70221.7375.8461427.20.809197.6
SanDisk Extreme Pro UHS-II SD Reader/Writer95.11868.53087.46732.5805.8911438.30.813198.4
Kingston FCR-HS4 Card Reader94.85168.51287.01921.4305.8161419.90.984240.2
Lexar Professional Dual Slot UHS-II Card Reader94.84268.45452.82132.7325.2381278.70.675164.9
Delkin Travel Reader94.26267.50284.46529.3505.9001440.50.814198.8
Lexar Professional Workflow SR194.10268.38785.12325.6895.4951341.70.807197.1
Transcend SD Card Reader RDF5 Black93.99268.13484.59019.4034.6701140.00.742181.1
Delkin Universal Memory Card Reader93.95067.75185.61235.7595.5761361.30.756184.5
Transcend Multi-Card Reader RDF993.59868.47686.68821.8035.8231421.50.810197.7
Kingston MobileLite G4 UHS-II93.14968.67486.74528.2395.8471427.40.810197.9
Delkin Dual Slot SD UHS-II and CF Card Reader93.14168.35686.54522.0185.7651407.50.31476.6
Lexar Professional Dual Slot Reader92.65568.54884.94024.2665.6501379.30.805196.6
Sony MRW-E90 XQD 2.0 / SD UHS-II Card Reader92.43466.79782.96022.1875.5031343.40.745181.9
SanDisk ImageMate All-In-One USB 3.092.23167.93577.35426.8503.883948.00.710173.3
Kingston Multi-Card Reader FCR-HS389.24865.29961.12634.0835.8331424.10.807197.0
Transcend Multi-Card Reader RDF8 Black73.43058.39464.35119.6905.0441231.40.640156.2

In digital camera tests the write speed measured 58.9 MB/s in the Nikon D500 during continuous shooting of RAW images. Additional in camera write speed averages are shown in the chart below.

Lexar Professional 633x U3 128GB
Tested in Camera
Write Speed
(MB/s)
Canon 80D59.2
Nikon D50058.9
Fuji X-Pro257.3
Fuji X-T1048.1
Olympus PEN-F39.7
Sony A7R II34.7
Sony A630032.6

Cameras tested with this card: Canon 80D, Fuji X-Pro2, Fuji X-T10, Nikon D500, Olympus PEN-F, Sony A7R II, Sony A6300

The 128GB card performs very similarly to the 64GB capacity 633x card. By offering twice the storage in the same package, it allows additional spave for hours of video recording or thousands of still images. Lexar Professional series memory cards are backed by a lifetime warranty.

The following table contains information encoded in the SD card.

Lexar Professional 633x U3 128GB SD — Internal Card Information
Serial number (PSN)17302189
Product Name (PNM)
Product Revision0.1
Manufacturer ID (MID)0x000028
OEM ID (OID)BE
Manufacture Date (MDT)05/2015
Total capacity128,109,772,800 bytes

Available sizes and prices

Compare prices on the Lexar Professional 633x U3 card. The lowest prices are highlighted in the table below. Prices are updated daily.

CardSize
GB
Lowest
$ / GB
Prices
AmazonB&H PhotoAdorama
Lexar Professional 633x U332$0.94$29.99Check priceCheck price
Lexar Professional 633x U364$0.61$38.95Check priceCheck price
Lexar Professional 633x U3128$0.37$46.99Check priceCheck price
Lexar Professional 633x U3256$0.41$105.98$105.98$105.98
Lexar Professional 633x U3512$0.43$220.00$220.00$220.00