256GB SSD Write Speed - Pro Retina 13" Only

Hello,
For folks who have 256GB SSD on the MacBook Pro Retina 13", what is your Write Speed in terms of MB/s? Please note that this is for 13", not 15".
Several reviews claim that 256GB should get around 700MB/s for Write, as well as for Read.
I just got my MBPr 13 yesterday and only installed iWorks, iPhoto, iMovie, GarageBand, Flash. All these only take about 5GB. I then tested the SSD Write/Read speed using BlackMagicDesign Disk Test and this what I got:
Write: 550 MB/s
Read: 700 MB/s
So I am off by 150 MB/s and I am wondering if the slow down is caused by the 5GB software (iWorks, iPhoto, etc) that I installed after unboxing. I can understand the slow down as SSD is filled up with more stuff but the amount of speed reduction only from 5GB of new software surprised me.
Or did I simply have a defective SSD and should return this to Apple for a refund or exchange?
Appreciate your feedback!

The larger the SSD drive the faster they are. But you are confusing the reading speed with the writing speed. The SSD write/read speed for a 128GB MBA (2013) should be around 420/720 Mb/s.The larger 256 GB does provide the 700/700 Mb/s write/read speeds.

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Ninja edited your post
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soumenfromkaiserslautern wrote:
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DaveG303 wrote:
here is some background.
1) the drive will be blank and unformatted with no OS.
2) I have a time machine back up on my time capsule. The original disk is completely dead.
3) In addition to Mavericks I also run Windows 8.1
Questions- once I replace the old drive with the new one:
A) how will I format my new SSD? I am guessing disk utility will come up when I turn the commuter on?
B) how do I get Mavericks Mac OS on the new drive? Do I need to pay? How will I get my time machine back up on the new drive?
C) should I format the new SSD a special way because I will be running windows on the machine? I ran windows with Parallels on the machine prior to my original SSD dyeing, was planning on doing the same with the new one.
D) what, if anything, can be done to avoid killing this new SSD like the last one? I am happy OWC has 3 yr warrantee on it!
Thanks in advance for help and guidance. I am a relatively novice user, so basic explanations will be appreciated.
Thanks,
Dave
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B. You can install OS X Mavericks from the OS X Utilities menu and during setup plug in your TM back up to restore your user account(s), apps and data.
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