LUFASND Micro SD Express Card – Up to 880MB/s

I'm incredibly happy with this product so far! I purchased it for my Switch 2, but wanted to see how well it kept up with heavier games before buying the 512GB option.

I find that the korok forest in LoZ BotW/TotK is a good speed read test. Its one of the most cpu heavy areas in the game due to just how many active textures and objects are loaded at once.

I also tried Rhythem Heaven Groove (if there is any lag during the read process, you'd know right away. This game is incredibly sensitive to even the slightest mis-timing).

Cult of the Lamb, while not a super large game, it has been known to lag during certain boss battles on the Switch version. I wished I could have made it to TOWW as people have reported lagging, but I haven't made it that far yet. I can say all battles up to Heket are smooth!

I have a pretty extensive library of games for the Switch, so if you'd like me to try a particular game and how well the SD card holds up, let me know. ♡

It's done a great job so far and any worries I had about buying from a lesser known brand of sd cards have been removed. The value for money is impressive and I usually don't risk buying non-brand when it when it comes to my gaming data. I've been burned before lol. I will definitely be returning to purchase the 512GB version.

With memory prices where they are lately, it was refreshing to see a manufacturer pricing their product below the well-known brand names. The AI boom has driven a supply-and-demand crunch across the board — memory cards, NVMe SSDs, hard drives, all of it. So when this card showed up on Vine, I was eager to try it.

The moment I pulled the card out of the packaging, it was clear something was different, and I had to recalibrate my expectations accordingly. Flipping it over, I noticed an extra row of pins on the back that I hadn't seen on any microSD card before. Those additional pins carry the higher-speed PCIe interface that sets this card apart from the standard microSD cards I already own, and they're the reason a normal reader can't take advantage of its full speed.

Sure enough, my first test — run on one of my existing readers — only produced a read speed of about 90 MB/s, nowhere close to the 880 MB/s advertised on the package. That confirmed what the extra pins had suggested: I needed a proper Express-compatible reader to unlock this card's real performance. That wasn't much of a hardship, since all my existing readers were USB-A anyway and couldn't take advantage of the Thunderbolt ports on my MacBook Pro regardless. So, shopping I went.

Once I had the new reader in hand, the difference was dramatic — not just in read speed, but burst write speed landed in the same performance tier as well. In my first test, using 512 MB file transfers, I measured a sequential read speed of 886.5 MB/s and a write speed of 775.86 MB/s. That matched the package claims almost exactly, and honestly, it was hard to wrap my head around a card this small hitting those numbers.

Bumping the transfer size up to 32 GB files, speeds dropped noticeably, but still remained far ahead of a standard microSD card's 90 MB/s read / 40 MB/s write on the same reader. Sustained speeds settled around 600 MB/s read and 300 MB/s write. Both directions heated the card significantly, with write operations running slightly hotter — expected, given that flash memory generally requires higher voltage and current for writes than for reads. I'm not certain what the card's official thermal limits are, but I measured temperatures as high as 170°F on the card's exposed end outside the reader during sustained transfers.

Bottom Line:

✅ Genuinely delivers on its advertised burst speeds (886.5 MB/s read, 775.86 MB/s write measured)

✅ Sustained large-file performance still far outpaces standard microSD cards (600 MB/s read, 300 MB/s write)

✅ Priced more competitively than major brand-name alternatives

✅ Performance holds up as expected given known microSD Express thermal limitations

✘ Requires a dedicated Express-compatible reader (with the extra pin contacts) to unlock true speed — older readers only achieve UHS-I speeds

✘ Runs hot under sustained transfers, with thermal throttling reducing speeds significantly during large file operations

✘ Measured surface temperatures as high as 170°F during heavy sustained use

Given the known thermal constraints inherent to the microSD Express format itself, this card performs right where it should — both in short bursts and sustained transfers — making it a solid recommendation, as long as you're prepared to invest in a proper reader to actually take advantage of it.

I have used this for almost 2 months. This little card has worked flawlessly in both my Switch 1 and in a few tablets and phones. I was not familiar with the brand but decided to try it anyway due to its storage capacity and speed specifications. I was not disappointed. The card has worked well to transfer photos from 2 of my phones to my laptop and also some other files from a tablet. I have not experienced any compatibility issues and the storage capacity is superb. It fits perfectly in every device tested and was very easy to use. I also tried formatting it initially and had no problems whatsoever. I am extremely pleased with its performance and reliability and highly recommend it. It is a great value for its quality and price.

With today’s cell photos and tablets, the need for additional storage is a must. This 512GB SD card should meet all your needs. I loaded into my Galaxy Tablet and it worked perfectly. I now have enough space to hold all of my photos and music. The SD card worked perfectly. This is a Micro SD card, so make sure it will fit your device. I also have a converter to allow it to be used as a full-size SD card so if I need it to offload photos from my laptop, I have that ability.