Lexar Professional 1000x 64GB microSDXC UHS-II Card (LSDMI64GCBNA1000A)

I bought this to use with the Garmin VIRB Ultra 30 Action Camera. I have recorded several videos at 4K/30 FPS (max resolution that the camera can dish out) without any issues so far. I also did some benchmarks using Ubuntu (dd, gnome-disk, iometer and bonnie++) and it has very high reading speed (+ 100 MB/s), but not so high writing speed.Initially I bought Samsung Pro Plus 128GB MicroSDXC Memory Card (MB-MD128DA/AM), which had away better benchmark when writing, but, at the end, what really matters is if the card can keep up with what the camera is dissing out and I ended up constantly having corrupted videos and/or corrupted G-Metrix, so I returned it. Before returning it, I tested the card for corruption, I did many benchmarks and the card passed on all of them. I still do not know why so many corrupted files (some of the videos would not play and I could not import the G-Metrix).The other thing that I love is the USB adapter, it has far better performance than the SD adapter that comes with most of the other brands, it fits on a regular USB port (no need to have a card reader) and it is easy to use. It also works with other brands of Micro SD.

Read performance is great -- using the included USB reader I was able to get 140MB/s read. Write speed on the other hand is disappointing, again using the included USB card reader, I was only getting 40MB/s.Update: retested this on a PC running Windows 10. Previous test was done on an iMac and I mistakenly made the assumption that the test result on iMac would be comparable to test results posted by others using CrystalDiskMark. A sequential write speed of around 60MB/s was obtained on a PC, making it a significant improvement of write speed over the blue colored 633x card. I am updating the score to 5 stars.Realizing that the benchmark results posted by other folks are not necessarily directly comparable to mine I set out to create a comprehensive list of current microSD cards on the market. The results are below.---------------------------------------------------------------------------------------------I had the opportunity to compare the performance of the fastest microsd cards currently available from top manufacturers. All cards mentioned in this review are obtained from Amazon during the last week or two except when noted otherwise.Test Setup:Lexar Professional workflow UR1 microsd card reader was used for all tests except when notedCrystalDiskMark 5.0.2 x64 was used to produce all the test results and was set up with 2 passes and 100MB read/write sizeAll cards up to 32GB are formatted as FAT32 with 32KB allocation unit size, all 64GB cards are formatted exFAT with 128KB allocation unit sizeTest Results (Numbers are Sequential Read, Sequential Write, 4K Random Read, 4K Random Write in MB/s, speeds greater than 10MB/s were rounded to the whole numbers)16 GB AlphabeticallyLexar 633x** -- 88, 25, 8.7, 1.2Panasonic U3** -- 93, 42, 11, 0.7Sandisk Extreme Pro -- 95, 80, 7.6, 2.632 GB AlphabeticallyDelkin U3 -- 93, 59, 11, 0.6Kingston 90R/80W -- 93, 58, 11, 0.6Lexar 1000x -- 90, 57, 10, 1.4 <== the listed productLexar 1000x with Bundled Reader* -- 148, 60, 10, 1.4 <== the listed productPatriot EP -- 90, 35, 10, 0.6PNY Turbo Performance -- 91, 55, 6.9, 0.9PNY Elite Performance Lime Green -- 94, 55, 7.4, 1.0Samsung Pro gray -- 92, 82, 10, 3.6Sandisk Extreme Pro -- 94, 87, 9, 3.0Sony up to 95MB/s -- 91, 51, 4.8, 0.9Transcend Ultimate 633x -- 93, 85, 8.1, 1.464 GB AlphabeticallyDelkin U3 -- 94, 27, 13, 0.3Kingston 90R/80W -- 94, 25, 13, 0.3Lexar 1000x -- 92, 56, 12, 1.5 <== the listed productLexar 1000x with Bundled Reader* -- 153, 66, 11, 1.7 <== the listed productPatriot EP -- 81, 22, 11, 0.6PNY Turbo Performance -- 92, 54, 6.9, 0.9PNY Elite Performance Lime Green -- 92, 54, 7.5, 1.0Samsung black -- 82, 20, 8.8, 2.1Samsung Pro gray -- 90, 80, 10, 3.5Samsung Pro+ *** -- 92, 86, 10, 5.3Sandisk Extreme Plus**** -- 92, 58, 10, 2.8Sandisk Extreme Pro - 97, 91, 10, 3.0Sandisk Ultra ***** -- 46, 16, 7.0, 2.1Sony up to 95MB/s -- 92, 49, 5.2, 0.9Transcend Ultimate 633x -- 93, 83, 7.3, 1.4128 GB AlphabeticallyLexar 633x -- 78, 28, 3.3, 1.4Sandisk Ultra -- 92, 19, 6.4, 2.4* The Lexar 1000x card is the only UHS-II card available and tested, the bundled USB reader has extra pins for reading UHS-II card** Came bundled with a device*** Purchased from a large west coast electronics retailer. This card is a new release and not currently available on Amazon. It is different from the gray-colored Pro card**** old model tested, not the current U3 model***** old model testedFastest Sequential Read:All tested cards were able to accomplish > 90MB/s, with the Lexar 1000x able to take advantage of UHS-II speed when using the bundled USB reader and leading the packFastest Sequential Write:Sandisk Extreme Pro, Samsung Pro+, Transcend Ultimate 633xFastest Random Read:Kingston 90R/80W.Fastest Random Write:Samsung Pro+Best overall:Samsung Pro+ and Sandisk Extreme ProOther observations:Performance and price are not proportional when it comes to selecting a microSD card. Some of the worst performing cards in this review also happen to be the most expensive.Not all 633x cards are created equal. The two cards reviewed from Lexar and Transcend are both marked as 633x but vary in performance greatly.4k video recording using action cams and drone cameras have a typical bitrate of 60mbps or 100mbps, corresponding to 7.5MB/s to 12.5MB/s. All cards in this review should theoretically be able to handle this usage easily.Using microsd card as supplemental phone storage potentially could benefit from a faster card,Best Looking Card (if it matters):Sandisk Extreme Pro: Red/Gold with white printLexar 1000x: White/Gold with Black/White printSamsung Pro+: White/Black with a red stripe and Black/White printPNY Turbo: Lime Green/Black with Black/White printUpdate 9/14/2015: Added additional cards to the list.Update 9/18/2015: Added 128GB Sandisk Ultra and Lexar 633xUpdate 9/21/2015: Added 2 PNY Elite Performance cards

Compare Lexar X1000 microSD $25(with USB3.0 reader) with Samsung Evo microSD $9.9 in 3 different readers.**Lexar X1000 32G microSD card with bundled USB3.0 Reader:Bundled USB3.0 reader: R/W/4kR/4kW 153/70/16/1.6 MB/sPCIe SDHC reader: R/W/4kR/4kW 81/62/12/1.2 MB/sUSB2.0 SDHC reader: R/W/4kR/4kW 19/17/4.2/1.2 MB/sLexar X1000 32G microsd card has very fast read speed and pretty fast write speed. The USB3.0 reader can keep a constant write/read high speed, though it gets very hot while transferring full 32G data. I have used 3 kinds of flash drives from Samsung and SanDisk, all of them reduced speed to usb2.0 level after a few Gigabytes of data transfer. Recommend it to any one.**Samsung EVO 32G microSD card:Bundled USB3.0 reader: R/W/4kR/4kW 46/39/10/4.0 MB/sPCIe SDHC reader: R/W/4kR/4kW 44/32/10/2.0 MB/sUSB2.0 SDHC reader: R/W/4kR/4kW 19/14/4/2.5 MB/sFor smart phones still using USB2.0 card reader, Samsung Evo is good choice for its good performance and cheap price. While Lexar X1000 can provide much faster download speed and pretty good writing speed.