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This review is from: SanDisk Extreme PRO 64GB UHS-1/U3 SDXC Memory Card Up To 95MB/s & 4K Ultra HD-Ready- SDSDXPA-064G-X46 (Label May Change) (Personal Computers)
I have reached advertised speeds on a built-in card reader and a newer digital camera but there are a few things anyone should know when choosing a card.
Cards with 32GB or less are SDHC and should work with most devices released in the last few years. SDXC will cover cards with higher capacities, such as this card in 64GB. This is an important consideration to Linux users since SDXC uses exFAT which may not work with your OS. If you have an up-to-date Windows installation or a recent Mac release you will be fine without third party software, though a firmware update may be necessary for your card reader if it's pre-'09.
You will not achieve UHF speeds on a USB 2.0 bus - you will see a maximum 20-30MB/S depending on file size and other factors. On many host devices the speed gains are negligible during operation because of fast internal memory buffers - I can burst (9/s) an average of 15 shots in RAW+jpeg on my DSLR with a class 6 card, or 18 with this - so probably not worth the premium price for that gain alone. Video there is no difference since the class 6 can float the 20mbps required for 1080i on my camera. In other words, if you can get the extreme pro in 64GB for the same price as the extreme in 128GB, your money is probably better spent on the extreme, if not on a non-UHF card, which is to say class 6 or 10.
It may be noteworthy that this card is waterproof and x-ray proof, but does not specify that it is magnet proof as other brands' documentation does. That said, Sandisk has some of the most robust built-in error checking features in the 'biz and other brands don't really compete in quality if you do some research.
My advice is to make sure you can use the extra speed you're paying for - if you don't have a USB 3.0 card reader, a host device with USB 3.0 PC connection, or a built-in card reader on a laptop that's either newer or has a recent firmware update, you may be wasting a fair sum of money here. Also make sure your device says SDXC if you do go above 32GB. Many devices' documentation will explicitly say that it works up to 32GB. It'll just try to format the card over and over if you feed it an SDXC.
Hopefully some info here was helpful! Happy hunting
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Showing 1-3 of 3 posts in this discussion
Initial post: Nov 23, 2013 7:13:30 AM PST
Thanks for the really helpful review. I wasn't even thinking about transfer speeds when I began my search today for memory for my new Canon 70D. My pc is antiquated (Vista), my laptop Win7, so according to your review, not compatible to capture the transfer speeds this product can offer (assuming no updated card reader, etc). I don't think you are saying that this card can't be read by outdated readers/computers, just that the improved speeds won't be there - is that correct?
Also, I was looking at this quality card for the improved write speeds, as I take a lot of burst shots, sports photography. The 70D also records video. Would you recommend this upgrade for this purpose?
In reply to an earlier post on Mar 16, 2014 11:41:12 AM PDT
CHRISTOPHER R. says:
Thank you ! That answers alot of questions for me !
In reply to an earlier post on Mar 16, 2014 12:26:52 PM PDT
Last edited by the author on Mar 16, 2014 12:29:04 PM PDT
P. Ballard says:
I didn't get notified of your question for some reason GoodFolk. SDXC has to do with format and therefore compatibility (consider both reader firmware and exFAT support from OS), UHF has to do with top speed. Your card readers may not be compatible with SDXC unless its been updated, but you can add an external card reader that is compatible on the cheap. That being said, you won't see speeds over 30MB/s or so unless you have a USB 3.0 reader on a USB 3.0 port. If your concern is burst speed at capture time, you can benefit from the top speed. Whether the extra expense is worth it depends heavily on your device.
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