On a per-gigabyte basis, the SanDisk 400GB Ultra card is a lot more affordable than the SanDisk 1TB Extreme card. Of course, the Extreme is much, much faster. IDG Comparing SanDisk Extreme vs SanDisk Ultra vs Samsung PRO Plus Print Email . SanDisk 512GB Extreme UHS-I microSDXC Memory Card with SD Adapter . Price: $129.99. Also read some tests saying that the Sandisk Extreme card is basically the same as Sandisk Ultra, but at the factory they grade the higher quality and faster cards as "Extreme". And testing them, they found that 4k Random read/write speeds were much higher on the sandisk Extreme, and benchmark sites concluded that the Extreme was worth the Both Samsung and SanDisk perform well in this area. While SanDisk claims read/write speeds of up to 1000-2000 MB/s in its SSDs, Samsung SSDs offer anywhere between (up to) 540 MB/s and 1050 MB/s. But, in the real-world scenario, both devices would likely return speeds of around 400-450MB/s. SanDisk Extreme vs. Ultra: 8 Must-Know Facts. Both SanDisk Extreme and SanDisk Ultra are products from Western Digital, a leading manufacturer of memory cards and card readers. SanDisk Extreme is an upgrade of SanDisk Ultra and possesses more capabilities and versatility than the latter. SanDisk 256GB Extreme PRO UHS-I SDXC Memory Card. B&H # SA256GBEPSD MFR # SDSDXXD-256G-ANCIN. 115 Reviews. Key Features. 256GB Storage Capacity. UHS-I / V30 / U3 / Class 10. Max Read Speed: 200 MB/s. Max Write Speed: 140 MB/s. Conclusion. The best choice for SD memory cards right now (Sept. 2014) appears to be the SanDisk Extreme SD 32GB — It’s fast and a good value at around $25. It’s also U3 (30MB/s) certified for 1080p HD and future-proofing you for 4K Ultra HD video cameras. Was checking Sandisk's 128GB and Kingstone's 256GB cards, any other recommendations and/or places to buy the cards you recommend? Click to expand sandisk ultra 200GB here and with 30 games .xci and .nsp i have 30GB of free space in the SD. FrWt.