128GB Transcend Ultimate UHS-I U3M microSD Review

128GB Transcend microSDXC UHS-I U3M memory card (TS128GUSDU3M) is in the house. Yes, it is capable of incredible read and write speeds of up to 95MB/s and 60MB/s with UHS Speed Class 3 (U3) and UHS Video Speed Class 30 (V30) standards. Easily capture ultra-high quality 4K and 3D recordings. In addition, it has top-tier MLC NAND flash chips inside are durable and reliable. Loaded with Error Correcting Code (ECC) can detect and correct transfer errors too. Extremely protective with waterproof, temperature proof, static proof, X-ray proof and shock proof. How does it perform? Let’s find out…

Special Thanks
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Package Content & Design
Simple yet protective packaging. 128GB Transcend Ultimate microSD comes with a SD adapter as you can see. Mine has lifetime warranty but newer cards have 5 years warranty only from now on. Do take note. Besides 128GB model, there are 16GB, 32GB and 64GB capacities for you to choose. And it is rated as 95 MB/s read speed and 60 MB/s write speed.

Performance Result
Wow… Excellent performance from 128GB Transcend microSDXC UHS-I U3M memory card (TS128GUSDU3M) in CrystalDiskMark. Easily maintain reading speed with 96MB/s and exceeded specs writing speed with 81MB/s. That’s great!!!

Yes, even better writing speed in ATTO Disk Benchmark test. Reached 86MB/s writing here.

Let’s see Anvil’s Storage Utilities performance. Reading speed is a bit slower at 91MB/s while maintaining 81MB/s writing speed. And you can see Input-Output access Per Second (IOPS) performance for 4K tests as well. No App Performance Class 1 (A1) by SD Association love here. It exceeded 1500 read IOPS but failed to pass 500 write IOPS.

Okay, back to real world tests. BlackVue DR490L-2CH Dual FHD dash cam, Mi Action Camera 4K, Redmi Note 4 and Galaxy Note 8 are the devices used for testing. In short, Transcend Ultimate microSD passed with flying colours. Yup, it manages to perform even on summer hot temperature on dash cam in car. And able to write up to 4K UHD 100Mbit/s super fine quality mode on action camera. Never miss any important shots ever.

4K UHD video capture is working smoothly on Galaxy Note8. Taking photo is piece of cake for it no doubt. And below is the A1 SD Benchmark for your reference. Redmi Note 4 is getting the same result as Galaxy Note8.


  • Excellent read & write transfer rate
  • UHS-I U3 & V30 support
  • MLC with ECC support
  • Extreme protections
  • Decent build quality


  • No A1 support

Looking for a microSD card for your dashcam, smartphone, tablet, digital camera, recorder and drone camera? Be sure to check out Transcend’s UHS-I U3M microSD. Enjoy extremely fast read and write speed. MLC and ECC reliability. Interested? More information can be found at Transcend Website.


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