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The SanDisk Extreme PRO 512GB is a UHS-I SDXC card rated for 170 MB/s reads and 90 MB/s writes, with V30 and U3 ratings that cover 4K video and burst stills. It is the largest, fastest UHS-I card in SanDisk's mainstream line, aimed at DSLR and mirrorless shooters and videographers who want one card for long recording sessions. Its ceiling is the UHS-I bus: cards using UHS-II or CFexpress in compatible bodies write far faster, and V60 or V90 cards suit high-bitrate codecs better. Owners consistently rate it as dependable, with real-world writes close to the 90 MB/s claim.
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Lowest price we've seen: $179.95 on Nov 8 at Newegg. Tracked across 1 store since Nov 8.
Reviewers and owners describe the card as reliable and fast enough for 4K video and continuous stills, with write speeds close to the rated 90 MB/s. Complaints center on the UHS-I ceiling and the price premium over the Ultra line.
