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16 Responses
Not sure why these would be needed for video, they are ten times faster than the maximum bitrate the camera is capable of. If you’re referring to Raw buffer clearing, then I can certainly see the value these would offer… you could probably empty the buffer with these cards on a sustained basis at the full 12fps rate.
The minimum sustained write speed of these cards is only 240 Mbps, which covers the 1080p 200 Mbps ALL-I record mode of the GH4.
The Sandisk Extreme SDXC UHS-I 95MB/sec cards have already tested to be too slow for the prototype GH4 camera tests.
Can you provide a link to the tests that show the 95MBs Sandisks are too slow? Thanks.
I’ll have to see if I can find the link. It was in the comments from one of the people shooting with the prototype GH4 camera, and it’s possible that it might have been a compatibility issue with the camera’s beta firmware.
I own four of the Sandisk 64GB 95MB/sec cards that I use with my hacked GH2 and stock GH3 cameras, so I’m hoping that I can at least shoot 100 Mbps IBP footage with my cards.
If not, then I’ll buy a few of these new Kingston 64GB SDXC UHS-I U3 cards, which are less than half the price of the Sandisk U3 cards…
http://www.amazon.com/Kingston-Digital-64GB-UHS-I-SDA3/dp/B00I3BQJNA
– Guy
The cards are rated for 240 MBps, which is 1,860 Mbps. The GH4 records at 200 Mbps, so it’s way under the 1,860 Mbps.
As someone else mentioned, the problem is the minimum write speed being at least 30 MBps, to get minimum 240 Mbps.
These look like new UHS-II cards. I thought only the new Fujifilm X-T1 is currently compatible with the new format. GH4 is still UHS-II and cannot make use of the highest transfer speeds.
GH4 is UHS-I, I mean
Yeah the GH4 doesn’t have UHS-II capability (needs additional contacts),
so that’s a lot of money wasted for performance you don’t get to use.
The 95MB/s ones basically max out the UHS-I bus already:
https://www.sdcard.org/developers/overview/bus_speed/
UHS Speed Class 3 (U3) is what’s important for the GH4, that’s 30MB/s minimum. https://www.sdcard.org/developers/overview/speed_class/
The ‘old’ 95MB/s ones should already achieve the 30MB/s minimum even though not officially labeled as such … probably because the label itself was not yet official.
As it says on the SanDisk site: “Delivers up to 90MB/s**write and 95MB/s read rate for extreme speed.”
From the specs :
“Use SDXC/SDHC Memory Cards compatible with UHS Speed Class 3 (U3) when using high bitrate video recording mode over 100 Mbps.”
so GH4 can make good use of this speedy card
Now sandisk should put their controllers on all cameras
Anyone know if these can be used in place of Panasonic’s Micro P2 cards for their new Micro P2 lineup of cameras?
Toshiba exceria type 1, far far far far cheaper and just as good, probably better as Toshiba is THE leader in this field.
I use exceria type 2 even cheaper.
Type 1 link http://www.ebay.com.au/itm/TOSHIBA-32G-32GB-EXCERIA-SDHC-TYPE-1-SD-HC-UHS-I-CLASS-10-95MB-SEC-SD-H32GR7WA9-/271259043813?pt=AU_Electronics_Memory_Cards&hash=item3f284c87e5
Some day, I hope video-centric cameras will routinely support batteries with more capacity and the ability to record to SSDs onboard…. it’s hardly cutting edge tech…
They do already have those features. And cost more than you would want to spend. Or you would not be looking at the GH4. So be satisfied.
@jimspc:disqus – thanks for your and thoughtful informative response. Especially enjoyed the prescriptive “so be satisfied”. Nice to see that forums like these provide an outlet for people like you.
Buy the YAGH and an SDI recorder. Use the external power input in the YAGH. Covers your capacity and ability list. You just need big pockets to carry it all and a friendly bank manager. Be satisfied.