Silicon Power 512GB
Score: 100/100
Gigastone 256GB microSD
Score: 98/100Rankings
A 512 GB microSDXC U3/V30/A2 card delivering up to 170 MB/s read and 150 MB/s write, rugged durability and high-endurance options, suited for 4K video, Android apps and demanding outdoor use.
The Gigastone 256 GB microSDXC offers strong 4K video capability, solid durability and a unique 5-year data-recovery warranty, making it a dependable mid-range choice. Real-world write speeds fall short of the advertised maximum, which may limit high-bit-rate use cases.
| Attribute | | |
|---|---|---|
512 GBbest | 256 GB | |
170 MB/sbest | 130 MB/s | |
150 MB/sbest | 85 MB/s | |
5 yearsbest | 5 yearsbest | |
| ↓ lower better | 0.3 gbest | 0.57 g |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Storage & Capacity(1) | ||
Capacity (GB) | 512 GB | 256 GB |
Performance(3) | ||
UHS Speed Class | U3 | UHS-I |
Maximum Read Speed (MB/s) | 170 MB/s | 130 MB/s |
Maximum Write Speed (MB/s) | 150 MB/s | 85 MB/s |
Physical(1) | ||
Weight (g) | 0.3 g | 0.57 g |
Products in the top-left offer the best value (high score, low price).
Professional reviewers consider Silicon Power's 512 GB U3 cards reliable mid-tier options that deliver solid 4K video performance and useful A2 app acceleration, highlighting durability, endurance features and a long warranty as key strengths, while noting they don't match the top speeds of SanDisk or Samsung.
Everyday users praise the cards for consistent 4K recording, good durability and the long warranty, especially noting the High Endurance model's reliability in dashcams, but also mention occasional speed variability, confusing model labels and incompatibility with the upcoming Switch 2.
“Users report seamless use with Nintendo Switch, with no lag or loading issues”
“One reviewer noted a discrepancy between advertised and actual specs-listing claimed 150/140 MB/s, but card was labeled 100/90 MB/s”
“Some users report lower-than-advertised write speeds (e.g., 58 MB/s in testing)”
Professional reviewers praise the reliable 4K capture and durability, noting the free 5-year data recovery as a unique value add while cautioning that real-world speeds can be lower than advertised.
Everyday users appreciate the robust build and long warranty, but many report write speeds that don't match marketing claims and occasional freezing on lower-end cameras.
