Review Index:

Crucial M550 2.5" SATA SSD Full Capacity Roundup

Subject: Storage

IOMeter - Average Transaction Time (rev 1)

Back with the Kingston SSDNow V Series 40GB review, I revised the layout of these graphs to better show SSD latency and access time.  First, I have removed HDD results as they throw the scale too far to tell any meaningful difference in the SSD's you are trying to focus on.  Second, I have reduced the queue depth scale down to 4.  In practical terms of a running OS, queue depth is how many commands are 'stacked up' on the SSD at that time.  An SSD is so fast at servicing requests that typical use will rarely see it increasing past 4.  In the cases where it does, there is so much going on that you are more concerned with IOPS and throughput at that point than transaction time.  The below charts are meant to show how nimble a given SSD is.  Think of it as how well a car handles as opposed to how fast it can go.

Some notes for interpreting results:

  • Times measured at QD=1 can serve as a more 'real' value of seek time.
  • A 'flatter' line means that drive will scale better and ramp up its IOPS when hit with multiple requests simultaneously.

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August 2, 2014 | 09:15 PM - Posted by Dr_Rob (not verified)

You were all impressed with performance vs price for these 550 SSDs greater than 128Gb, and I tend to agree. The Samsung EVOs seem to be an additional $20-30, but the Samsung Magician software especially for firmware update notification is excellent. Does Crucial have software similar to Magician ? Because firmware updates are a pain.

December 23, 2014 | 12:48 AM - Posted by Jeanmark (not verified)

Hey guys I just saw your video and I was wondering, I want to buy a M550 128gb SSD because its very affordable compared to the same one with 256gb. Write now my Acer Aspire has a 250gb HDD, its to slow, that's why I am changing to SSD, but the question is: is their a difference in speed between those two? I use my laptop for recording music and stuff like that and the speed is very important to me.

December 23, 2014 | 12:50 AM - Posted by Jeanmark (not verified)

Is their a speed difference between the M550 128GB and the M550 256GB?

February 17, 2015 | 06:09 PM - Posted by 25 (not verified)

I agree, but it's not just the cost - it is also the capacity, power, and suitability for video recording. Low-power, video/surveillance 3.5" drives are available up to 6TB now, while 2.5" drives tend to max out at 2TB. If you are building a DVR which can record 6 or more programs at once, supporting 1 or 2 3.5" hard drives (as the reviewer showed) makes a lot more sense than using four 2.5" drives.

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