Probably SanDisk themselves. The Ultra series is a popular purchase because of their price and availability. They are not a good choice because of their high failure rates when used in dash cameras. As well SanDisk will not warranty any cards used in a dash camera unless you use their High Endurance lineup. 13. SanDisk 512GB Extreme MicroSDXC. 1. Best Steam Deck microSD card overall. Best if you want good speeds. $45.46 $45.76 Save $0.3. This SanDisk drive is the perfect balance of speed and size. It's a I need a 512GB micro SD and can't decide between Sandisk ULTRA (U1) or Sandisk EXTREME (U3). Both are UHS-I, but the Extreme version has official lifetime warranty Anyone that had or has both versions, which is better to run games on Switch? Get the Reddit app Scan this QR code to download the app now. Or check it out in the app stores Home SanDisk 512 Ultra is what I use. No complaints. Sandisk Ultra, Extreme or Extreme PRO are good picks for long term performance and reliability. TL:DR - Best Steam Deck SD Cards. SanDisk Extreme - 1TB - $149.99. Lexar Play - 1TB - $133.99. SanDisk Extreme Pro - 400GB - $67.99. Lexar Professional 1066x - 512GB - $82.99. Samsung EVO However, a Lexar card is generally cheaper than a SanDisk card, so some consumers prefer to take a small risk with Lexar and remove images regularly. Personally, I like a SanDisk card more than a Lexar card because of the overall build quality. Spending a few more dollars for a more-reliable card is a good bargain, and while Lexar Professional Steam won't get higher than ~30-35MB/s download speeds on my SanDisk Ultra (A1), but easily gets 80-90MB/s speeds on my SanDisk Extreme (A2). It's also far more stable when writing. Games do launch and load a bit faster (seems around 10-15%), but if that were the only change it wouldn't be worth the cost. The Sandisk Ultra is a memory card that works at up to 120 MB/s for the read speed, and for the writing speed, it works at 90 MB/s. The Sandisk Extreme, on the other hand, works at 150 MB/s (megabytes per second) for the reading part, and the writing one is at 70 MB/s. stop3 4 years ago #2. Ultra has slower read/write speeds than Extreme. They are both UHS-1, which is the standard that Switch uses, but the Ultra is U1 and the Extreme is U3. The main difference is that U1 Has slower minimum read/write speeds (and it's minimum is really slow). Yes, the Switch can take advantage of the speeds of UHS-1 U3 (but Google is your friend There happens to be an article from 2017 (updated recently with new prices on affiliate links) where they tested exactly what you're asking. Spoiler: There's almost no difference between Extreme and Ultra, which means the added speed is wasted on the Switch. yvPOOh.