UHS-1 in K-S2: What does it really mean?

AlexL · 02-11-2015, 10:25 AM

I've fallen behind on the memory card initialisms, but how does the UHS-1 support in the new K-S2 affect its use? Could it dump the buffer faster on supported SD cards? I would love it if that was the case.

Not a Number · 02-11-2015, 11:02 AM

UHS-I has a bus speed of up to 50/MB/s or 104MB/s. Normal and High Speed cards have a bus speed up to 12.5MB/s and 25MB/s, respectfully. Normal and high-speed cards can also be used with UHS-I host devices, but the high performance enabled by a UHS-I host device can only be achieved with a UHS-I memory card.

UHS-II has a bus speed max of 156MB/s or 312MB/s.

UHS-I and II are only found on SDHC and SDXC cards but only if they have the Roman Numeral I or II bus marks. You can use UHS cards in non-UHS rated hosts but you will only get the card Class rated speeds.

AlexL · 02-12-2015, 07:29 AM

Originally posted by Not a Number

UHS-I has a bus speed of up to 50/MB/s or 104MB/s. Normal and High Speed cards have a bus speed up to 12.5MB/s and 25MB/s, respectfully. Normal and high-speed cards can also be used with UHS-I host devices, but the high performance enabled by a UHS-I host device can only be achieved with a UHS-I memory card.

UHS-II has a bus speed max of 156MB/s or 312MB/s.

UHS-I and II are only found on SDHC and SDXC cards but only if they have the Roman Numeral I or II bus marks. You can use UHS cards in non-UHS rated hosts but you will only get the card Class rated speeds.

Sorry, my fault for not being clear but that's not what I was asking about.

I've read the specs, but specs and real-life experience isn't exactly the same thing. What would be the practical effect be on shooting with the K-S2? Maybe people with the K-3 experience can shed some light since I think it also has UHS-I support. Thanks.

Not a Number · 02-12-2015, 08:55 AM

The practical effect is you'd be able to maintain high burst and frame rates on stills and video. UHS-I has faster write rates (in theory) so the images or video stream can be written to the card and not lag as much from fewer buffer overruns.

02-11-2015, 10:25 AM	#1
AlexL Senior Member Join Date: Aug 2007 Location: Athens, GA Posts: 137	UHS-1 in K-S2: What does it really mean? I've fallen behind on the memory card initialisms, but how does the UHS-1 support in the new K-S2 affect its use? Could it dump the buffer faster on supported SD cards? I would love it if that was the case.

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02-11-2015, 11:02 AM	#2
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	UHS-I has a bus speed of up to 50/MB/s or 104MB/s. Normal and High Speed cards have a bus speed up to 12.5MB/s and 25MB/s, respectfully. Normal and high-speed cards can also be used with UHS-I host devices, but the high performance enabled by a UHS-I host device can only be achieved with a UHS-I memory card. UHS-II has a bus speed max of 156MB/s or 312MB/s. UHS-I and II are only found on SDHC and SDXC cards but only if they have the Roman Numeral I or II bus marks. You can use UHS cards in non-UHS rated hosts but you will only get the card Class rated speeds.

02-12-2015, 07:29 AM	#3
AlexL Senior Member Join Date: Aug 2007 Location: Athens, GA Posts: 137 Original Poster	Originally posted by Not a Number UHS-I has a bus speed of up to 50/MB/s or 104MB/s. Normal and High Speed cards have a bus speed up to 12.5MB/s and 25MB/s, respectfully. Normal and high-speed cards can also be used with UHS-I host devices, but the high performance enabled by a UHS-I host device can only be achieved with a UHS-I memory card. UHS-II has a bus speed max of 156MB/s or 312MB/s. UHS-I and II are only found on SDHC and SDXC cards but only if they have the Roman Numeral I or II bus marks. You can use UHS cards in non-UHS rated hosts but you will only get the card Class rated speeds. Sorry, my fault for not being clear but that's not what I was asking about. I've read the specs, but specs and real-life experience isn't exactly the same thing. What would be the practical effect be on shooting with the K-S2? Maybe people with the K-3 experience can shed some light since I think it also has UHS-I support. Thanks.

02-12-2015, 08:55 AM	#4
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	The practical effect is you'd be able to maintain high burst and frame rates on stills and video. UHS-I has faster write rates (in theory) so the images or video stream can be written to the card and not lag as much from fewer buffer overruns.