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Is Transcend Premium 300x UHS-I card overrated?


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#51 dencorso

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Posted 15 December 2014 - 05:44 PM

I have an Asus Eee PC 4G (or 701) running Full XP SP3 (with IE8 and Office 2003) beautifully from a (now rather old) SanDisk Extreme Full-Size SDHC 30MB/s Class 10 Card, with the pagefile set to the Card, since July 2010. It has just an 8 GB (soldered) SSD inside, which came with Xandros (and which remains there untouched), and came with 1 GiB RAM, which I maxed out (= 2 GiB for that machine). On Xandros the battery lasts somewhat longer, but there's hardly anything that can be done usefully on that. :)   

I'm considering upgrading it by replacing its older SanDisk Extreme Full-Size SDHC 30MB/s Class 10 Card by the 45MB/s, which tests I've posted at the beginning of this thread, now that I bought the 95MB/s, about which I posted above. Since they both fully saturate the USB 2.0 interface, those 45MB/s cards (which are already EoS, AFAIK) are a great choice!


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#52 Nuno Brito

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Posted 15 December 2014 - 06:39 PM

Hello,

 

The second you said, a hard disk will always drain more power that a solid state device.

 

Sorry to disappoint Wonko, but where in my previous reply do you read such statement?

 

I'm asking if running the OS from an SD card, not from an SDD or HDD storage would have a noticeable difference on battery life.

 

On this point I'm not an expert. Doesn't help that some reviewers mention SSD as more power hungry than HDD for laptops: http://hackaday.com/...p-battery-life/ while what I'm interested right now is to try something like dencorso mentions. Looks fun. :)



#53 Wonko the Sane

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Posted 15 December 2014 - 07:20 PM

Hello,

 

 

Sorry to disappoint Wonko, but where in my previous reply do you read such statement?

 

I'm asking if running the OS from an SD card, not from an SDD or HDD storage would have a noticeable difference on battery life.

 

On this point I'm not an expert. Doesn't help that some reviewers mention SSD as more power hungry than HDD for laptops: http://hackaday.com/...p-battery-life/ while what I'm interested right now is to try something like dencorso mentions. Looks fun. :)

Isn't a SD card a "solid state device"? :unsure: :w00t:

 

Try with a Multimeter (Amperometer) on a USB connected SD card reader + SD card in it, and compare with another on a USB controller+rotational hard disk.

 

HInt: last time I checked most USB 2.0 card readers declared themselves as "low power" devices (200 mA), whilst all USB 2.0 HD controllers declared themselves as "high power" devices (500 mA) and a few hard disks exceed those specs and actually need a "Y USB cable".

 

Just for the record, typical power requirements of SD cards are hidden in plain view on Wikipedia:

http://en.wikipedia....wer_consumption

 

And BTW, do check some more recent data, that article about SSD's using more power than HD's is from 2008, those were the very early SSD's

http://arstechnica.c...c.php?t=1226363

of course there are "power hungry" SSD's and "power saving" hard disks...

 

:duff:

Wonko



#54 Nuno Brito

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Posted 15 December 2014 - 09:01 PM

Thanks for the link on the SD power consumption. It is indeed very low in terms of power consumption, they average less than 1 W for normal read/write operations.

 

SSD storage in average doesn't seem to reach such low values. Just looking on a drive released a couple of days ago from Samsung we can read:

 

Power Consumption

  • Active Read/Write (Average): Max. 3.7W(1TB)/ Max. 4.4W(1TB)
  • Idle: Max. 50mW
  • Device Sleep: 2mW (120/250/500GB), 4mW(1TB)

http://www.storagere..._evo_ssd_review

 

This isn't much different from what one can see written elsewhere: http://superuser.com...ard-card-reader

 

Nevertheless, looking on the official specs for the SSD on my laptop (Samsung 840 EVO) it seems power efficient, I don't trust the manufacturer as it could be biased but this review appears somewhat reliable: http://www.tomshardw...sd,3567-13.html

 

So, I'm still in doubt.

 

Which storage would consume less power?

 

Any trustworthy information published where one can read about SD power consumption (comparative analysis per model and so forth)?

 

:cheers:



#55 dencorso

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Posted 16 December 2014 - 01:17 AM

This is the same 45 MB/s Full-Size SDHC card from my initial posts in this thread, but there it's tested on my Asus A-7V600-X / Athlon XP 3000+ desktop, while here it's tested on an actual Asus Eee PC 900 (not the same I run from an SDHC card, but generally the same hardware). Please notice that the Eee PC Card-Reader is optimized for giving great 4K Random Writes, which means someone at Asus had thought it might conceivably be used for booting (or, perhaps, that also may mean the ICH6-M is really better for booting).
 
===================================================
SanDisk Extreme SDHC 45 MB/s UHS-I 32 GB Card (Class 10, UHS Speed Class 1)
Adapter: Asus Eee PC 900 Card-Reader (USB 2.0)
Controller: Intel ICH6-M onchip USB 2.0 
Intel Celeron-M ULV 353 @ 900 MHz / Asus Eee PC 900 - Win XP SP3
--------------------------------------------------
CrystalDiskMark 2.2 (C) 2007-2008 hiyohiyo
      Crystal Dew World : http://crystalmark.info/
--------------------------------------------------

    Test File Size :      100 MB
   Sequential Read :   17.235 MB/s
  Sequential Write :   15.660 MB/s
 Random Read 512KB :   17.190 MB/s
Random Write 512KB :   13.642 MB/s
   Random Read 4KB :    5.394 MB/s
  Random Write 4KB :    3.553 MB/s

 

--------------------------------------------------
SanDisk Extreme SDHC 45 MB/s UHS-I 32 GB Card (Class 10, UHS Speed Class 1)
Adapter: Transcend RDS-5 on USB 2.0
Controller: VIA 8237 onchip USB 2.0
Athlon XP 3000+ @ 2337 MHz / Asus A7V600-X - Win XP SP3
--------------------------------------------------
CrystalDiskMark 2.2 (C) 2007-2008 hiyohiyo
      Crystal Dew World : http://crystalmark.info/
--------------------------------------------------

    Test File Size :      100 MB
   Sequential Read :   19.523 MB/s
  Sequential Write :   17.292 MB/s
 Random Read 512KB :   19.258 MB/s
Random Write 512KB :   11.842 MB/s
   Random Read 4KB :    4.611 MB/s
  Random Write 4KB :    2.321 MB/s

--------------------------------------------------
SanDisk Extreme SDHC 45 MB/s UHS-I 32 GB Card (Class 10, UHS Speed Class 1)
Adapter: Kingston USB 3.0 MobileLite G3 (FCR-MLG3) on USB 2.0
Controller: VIA 8237 onchip USB 2.0
Athlon XP 3000+ @ 2337 MHz / Asus A7V600-X - Win XP SP3
--------------------------------------------------
CrystalDiskMark 2.2 (C) 2007-2008 hiyohiyo
      Crystal Dew World : http://crystalmark.info/
--------------------------------------------------

    Test File Size :      100 MB  
   Sequential Read :   30.495 MB/s
  Sequential Write :   26.600 MB/s
 Random Read 512KB :   29.218 MB/s
Random Write 512KB :   15.107 MB/s
   Random Read 4KB :    4.505 MB/s
  Random Write 4KB :    2.107 MB/s


The above quote is from post #4, but newly reformatted for easier comparison.
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#56 Wonko the Sane

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Posted 16 December 2014 - 12:25 PM

@Nuno

Yep, but as you can see the actual power consumption depends on BOTH "peak" and " idle" AND on amount of time these two states are into in a given timeframe.

To take your 840 Evo as an example, it's power consumption is clearly given largely by it's "idle" state, with "burst" of "full power" that last very, very little (because the thingy is d@mn fast).

 

There is a very good way (empirical) to understand if a given SSD uses less power than a given hard disk,

http://en.wikipedia...._thermodynamics

simply run normally the system for some time, then "feel" the device with your hand, the one which is warmer is the one that used more power.... :whistling:

 

SD cards are vastly used by the good "embedded" tweakers, which nowadays translate to either "Arduino" or "RaspberryPi", so you'll have t look in places where they gather, like:

http://www.raspberry...ic.php?p=164893

http://forum.arduino...?topic=261021.0

 

:duff:

Wonko


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