[jogiba]

I bet there will be 4K cameras coming that support UHS-II for 60fps later in the year.

Quote:
SanDisk has released new UHS-II SD cards with write speeds up to 250MB/s and read speeds up to 280MB/s. This new line gets its major speed boost from the UHS-II bus interface. Most SD-compatible cameras currently on the market support UHS-I, at best; however, we are just starting to see new cameras with UHS-II support (like the Fuji X-T1).


The new UHS-II bus interface offers the ability to build cards with up to 312MB/s transfer speeds, which is a big jump from the maximum theoretical speeds on the UHS-I interface at 104MB/s.


The new UHS-II cards have a second row of pins to support the higher data transfer rates. The first row of pins are identical to the standard SD cards we’ve seen on the market over the past several years and allow UHS-II cards to function normally in older, non-UHS II devices. Of course, if you don’t have a UHS-II compatible device, you will not see the speed benefits from the UHS-II bus interface.


UHS Speed Class symbols, such as U1 and U3, indicate minimum write speeds for real-time video recording. For UHS rated cards, you will find the numeric class rating within the letter “U” on the card’s label. (See the U3 labeling in the top image.)


Compressed 4K video capture data transfer rates will vary among cameras depending on what codec the camera uses. The new U3 Speed Class should be plenty fast enough to handle Sony’s XAVC-S 4K codec (used in the new Sony FDR-AX1), which captures 4K video at a 150Mb/s data rate. The U3 Speed Class at 30MB/s minimum write speed translates to a 240Mb/s data rate. While the 30MB/s minimum write speed may seem low, it’s worth noting that the SD Association has not established a speed class rating higher than U3 at the time of this card’s release.


Photographers need to keep in mind that the U1 and U3 ratings are practically meaningless for still photography. The max data transfer rates can vary widely among cards with the same U1 and U3 ratings.


Additionally, while there are UHS-I cards that offer a U3 speed class rating, it is unclear whether the U3 rating on these new SanDisk cards is valid for non-UHS-II devices. For more about SD card types and ratings, see the resource article Demystifying SD Cards.


The new SanDisk Extreme PRO UHS-II cards should be available in April in 16GB to 64GB capacities for $119.99 to $299.99.

http://www.photographybay.com/2014/02/12/sandisks-new-extreme-pro-sd-uhs-ii-cards-are-worlds-fastest-sd-cards/









SanDisk UHS-II Card Reader

 

[img eL]

Yeah I'm not messing with anything less than a Extreme Pro SD when shooting 4k, not even going to risk it. Dropped frames? No thanks

 

[jogiba]

I wonder if the Samsung Note 4 will have 4K @60fps with support for the new UHS-II Micro SDXC cards.

 

[Ken Ross]

I seriously doubt it Joe. But how ironic would it be if it did!

 

[hatchback]

What type of card does the GH4 require for the 200Mbps footage?

 

[jogiba]



Quote:
Originally Posted by hatchback  /t/1517570/sandisk-s-new-extreme-pr...cards-with-280mb-s-for-4k-60fps#post_24351973


What type of card does the GH4 require for the 200Mbps footage?

The GH4 uses UHS-1 speed class 3 SD cards.

 

[Tugela]

Note that while the card has a burst write speed of up to 250 MB per second, the sustained write speed is only 30 MB per second.


Whenever you look at SDHC cards the write speed specification typically reads as "up to xxxx MB per second". What you get in the real world for sustained use is a lot less, and that causes a lot of confusion for many people who only look at the number and think that is what they are always going to get.

 

[jogiba]



Quote:
Originally Posted by Tugela  /t/1517570/sandisk-s-new-extreme-pr...cards-with-280mb-s-for-4k-60fps#post_24375888


Note that while the card has a burst write speed of up to 250 MB per second, the sustained write speed is only 30 MB per second.


Whenever you look at SDHC cards the write speed specification typically reads as "up to xxxx MB per second". What you get in the real world for sustained use is a lot less, and that causes a lot of confusion for many people who only look at the number and think that is what they are always going to get.

30MB/s is the minimum. Why would someone pay $300 for a card with the same speed as a $30 card ? The new UHS-II speed class 3 cards should do 4K 60p without a problem.

 

[Tugela]

The sustained write speeds of those $30 cards are a lot less, irrespective of what is written on their labels.

 

[jogiba]

So exactly what is the problem ?

 

[Tugela]

There is no problem, I was just pointing out what the realistic write speeds of the cards are, according to the manufacturers, since some here believe that the maximum write speed is what they get all the time

(not you).

 

[jogiba]

Last year I purchased a pair of Sony 16GB SDHC cards from B&H for $18.95 with free shipping that were rated at 94MB/s max and with my USB 3.0 card reader they run at 70-80MB/s . I will not purchase any more cameras unless it has 4K 60p and UHS-II support and if that does not come out by January 2015 then it looks like my first 4K camera will be a smartphone.

 

[jogiba]

B&H has the 16GB and 32GB 280MB/s UHS-II cards in stock.
http://www.bhphotovideo.com/c/search?Ntt=sandisk+uhs-ii&N=0&sts=ma&InitialSearch=yes

 

[Ken Ross]

Overkill for anything on my agenda Joe.

 

[hatchback]

What performance do they deliver on a UHS-I device?

 

[jogiba]

For UHS-1 supported cameras like the GH4 stick with UHS-1 speed class 3.
http://www.amazon.com/Kingston-Digital-64GB-UHS-I-SDA3/dp/B00I3BQJNA/ref=sr_1_1?ie=UTF8&qid=1392499631&sr=8-1&keywords=Kingston+UHS-I+U3




The only UHS-II supported camera today is the new Fuji X-T1 but UHS-II will be needed for 4K @60fps.

 

[jogiba]



Quote:
Originally Posted by Ken Ross  /t/1517570/sandisk-s-new-extreme-pr...cards-with-280mb-s-for-4k-60fps#post_24427489


Overkill for anything on my agenda Joe.

You could still use it in the AX100 Ken but the only advantage would be ultra fast 280MB/s uploading of your 4K files using the new Sandisk UHS-II reader and a USB 3.0 port on your computer.

 

[Ken Ross]

Joe, I have this waiting for my AX100:
http://www.bhphotovideo.com/c/product/824149-REG/SanDisk_SDSDXPA_064G_A75_Extreme_Pro_64GB_SDHC_SDXC.html

 

[jogiba]



Quote:
Originally Posted by Ken Ross  /t/1517570/sandisk-s-new-extreme-pr...cards-with-280mb-s-for-4k-60fps#post_24428357


Joe, I have this waiting for my AX100:
http://www.bhphotovideo.com/c/product/824149-REG/SanDisk_SDSDXPA_064G_A75_Extreme_Pro_64GB_SDHC_SDXC.html

That should work great in the AX100 Ken since that is the card the GH2 users used with the hacks that were over 100MB/s.
http://www.personal-view.com/talks/discussion/1491/95mbs-sandisk-extreme-pro-cards/p1

 

[Ken Ross]

Yeah, in actuality Joe, this card is overkill for the AX100 too. Far more read/write speeds than I or the AX100 needs.