Omni 10 SD performanc​e

Question

I ran some benchmarks on the Omni 10's SD performance, and came away disappointed.  Using a Samsung MB-MGCGB 64GB MicroSDHC Pro card and CrystalDiskMark 3.0.3, I got the following results:
CrystalDiskMark 3.0.3 (C) 2007-2013 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]
Sequential Read :    11.222 MB/s
Sequential Write :     6.438 MB/s
Random Read 512KB :    11.074 MB/s
Random Write 512KB :     0.742 MB/s
Random Read 4KB (QD=1) :     4.797 MB/s [  1171.2 IOPS]
Random Write 4KB (QD=1) :     0.008 MB/s [     2.0 IOPS]
Random Read 4KB (QD=32) :     5.176 MB/s [  1263.8 IOPS]
Random Write 4KB (QD=32) :     0.008 MB/s [     2.0 IOPS]
Test : 500 MB [D: 0.0% (0.0/62.5 GB)] (x3)
Date : 2013/12/25 17:00:02
OS : Windows 8.1  [6.3 Build 9600] (x86)
This is a UHS-1 card, so I was expecting better.  I have the latest driver package installed, and HP's Omni 10 specs page says it has an "Integrated micro SD card, support SDXC in DDR50, SDR25 and SDR12 mode".  I've seen much better results reported for the Venue 8 Pro, so I'm not sure what to think.
This is fast enough for media files, but hopelessly slow for hosting applications.  I'd appreciate additional data points and/or insights from the community.

Answer 1

Thanks for the info; very helpful.  It turns out the card I tested was an elaborate fake (complete with nearly perfect foil-printed packaging).  I bought a nominally identical Samsung card at Best Buy, and the results improved.  Under H2benchw, the genuine Samsung card managed 18.3 MB/s for reads and 13.6 MB/s for writes.  This is very close to what you reported, so it looks like that might be the best the Omni 10 can do.
CrystalDiskMark results for the genuine card:
Sequential Read :    23.445 MB/s
Sequential Write :    15.836 MB/s
Random Read 512KB :    22.781 MB/s
Random Write 512KB :    15.355 MB/s
Random Read 4KB (QD=1) :     7.033 MB/s [  1717.0 IOPS]
Random Write 4KB (QD=1) :     2.138 MB/s [   521.9 IOPS]
Random Read 4KB (QD=32) :     7.265 MB/s [  1773.7 IOPS]
Random Write 4KB (QD=32) :     2.099 MB/s [   512.6 IOPS]
Comparison to performance of the 32GB internal eMMC, in percentage terms:
27.06%  Sequential Read
35.58%  Sequential Write
28.71%  Random Read 512KB
42.00%  Random Write 512KB
63.37%  Random Read 4KB (QD=1)
18.71%  Random Write 4KB (QD=1)
23.53%  Random Read 4KB (QD=32)
14.18%  Random Write 4KB (QD=32)
This level of performance remains lower than I was hoping for, but might be adequate for applications with modest I/O demands.  I suppose it's acceptable for a device that's otherwise such a good value.  If only they could provide drivers that keep it from freezing every few hours...