The Lexar 633x 64GB microSDXC card positions itself as an affordable, mid-range storage option for smartphones, tablets, action cameras, and drones. With its UHS-I interface and U3/V30 speed ratings, this card promises to handle Full HD and 4K video recording without breaking the bank. But does it deliver on its performance claims? Let’s dive into the details.
Key Specifications
- Capacity: 64GB (microSDXC)
- Speed Class: UHS-I, U3, V30, A1, Class 10
- Read Speed: Up to 100MB/s (advertised)
- Write Speed: Up to 45MB/s (advertised)
- Compatibility: Smartphones, tablets, sports camcorders, action cameras, drones, digital cameras
- Warranty: Limited lifetime warranty
- Includes: SD adapter (model dependent)
Performance Testing
Real-World Speeds
Independent benchmark testing reveals that the Lexar 633x performs admirably in read operations but shows some variance in write performance:
- Sequential Read: Tests consistently show read speeds reaching 96-97 MB/s, essentially matching the advertised specifications
- Sequential Write: Write speeds measured between 17-33 MB/s in various tests, falling short of the 45MB/s claim but still adequate for most use cases
- 4K Random Access: Performs commendably compared to competing cards in this price range
Video Recording Capability
The U3 and V30 ratings guarantee a minimum write speed of 30MB/s, which is the threshold required for:
- 4K video recording at standard frame rates
- Full HD 1080p at high frame rates
- 3D video capture
Multiple users have reported successful 4K recording on devices like GoPro action cameras and modern smartphones, confirming the card’s suitability for video-intensive applications.
Design and Build Quality
The Lexar 633x features a straightforward, no-frills design with all specifications clearly printed on the front of the card. The labeling is permanent (printed rather than stickered), which prevents peeling and ensures longevity. The card is manufactured in Korea, which is generally associated with quality NAND flash production.
While Lexar doesn’t explicitly advertise environmental protection features, the card appears to be reasonably durable for everyday use. However, if you need guaranteed waterproof, shockproof, or temperature-resistant storage, you may want to verify these specifications or consider cards with explicit protection ratings.
Value Proposition
Pros
- Affordable pricing – Often available for under £10-15, making it one of the most budget-friendly options in its class
- Reliable read performance – Consistently delivers on read speed promises
- Lifetime warranty – Provides peace of mind for long-term use
- Versatile compatibility – Works with a wide range of devices from smartphones to cameras
- A1 rating – Optimized for faster app performance on Android devices
Cons
- Write speeds below advertised specs – Real-world write performance typically falls 25-40% below the 45MB/s claim
- Not the fastest in its class – Competitors like SanDisk Extreme offer superior performance at similar price points
- Brand uncertainty – Lexar was sold to Chinese company Longsys in 2018, which has raised some concerns about long-term brand consistency
Who Should Buy This Card?
The Lexar 633x 64GB is ideal for:
- Budget-conscious consumers who need reliable storage without premium pricing
- Casual photographers and videographers shooting Full HD or 4K content at standard settings
- Smartphone users looking to expand storage for apps, photos, and videos
- Drone pilots using recreational drones with moderate recording demands
- Tablet owners who need additional storage for media and documents
Who Should Look Elsewhere?
Consider alternative options if you:
- Require maximum write speeds for burst photography or high-bitrate 4K recording
- Need guaranteed durability specifications for extreme conditions
- Are shooting professional content where performance consistency is critical
- Want the absolute fastest UHS-I performance available
Alternatives to Consider
- SanDisk Extreme (64GB) – Slightly more expensive but offers better write performance
- Samsung EVO Select (64GB) – Similar pricing with more consistent write speeds
- Kingston Canvas Go! Plus (64GB) – Comparable specifications with strong reliability track record
Final Verdict
Rating: 3.5/5 Stars
The Lexar 633x 64GB microSD card is a competent, budget-friendly storage solution that delivers where it matters most for casual users. While the write speeds don’t quite match advertising claims, the card performs reliably for everyday photography, Full HD video, and even 4K recording at standard frame rates.
The lifetime warranty adds significant value, and the A1 rating makes it a smart choice for Android smartphone users looking to boost storage and app performance. However, if you’re a professional content creator or need guaranteed high-speed performance, investing a bit more in a premium card may be worthwhile.
For the average consumer prioritizing value over peak performance, the Lexar 633x represents a solid purchase that won’t disappoint for typical use cases. Just keep your expectations realistic regarding write speeds, and you’ll find this card to be a reliable workhorse for everyday storage needs.
Bottom Line
Best for: Budget-conscious users, casual content creators, smartphone storage expansion
Skip if: You need maximum write speeds or professional-grade performance
Price Range: £5-15 (varies by retailer and promotions)
Get the Lexar 633x on Amazon : https://amzn.to/4qkFydB
Have you used the Lexar 633x microSD card? Share your experience in the comments below!
