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Samsung SM951 512GB M.2 PCIe SSD Review

By: Chris Ramseyer | PCIe in Storage | Posted: Jan 30, 2015 2:42 pm
TweakTown Rating: 98%Manufacturer: RamCity

Bapco MobileMark 2012 1.5


Version and / or Patch Used: 2012 1.5

Developer Homepage:

Test Homepage:


MobileMark 2012 1.5 is an application-based benchmark that reflects usage patterns of business users in the areas of office productivity, media creation and media consumption. Unlike benchmarks that only measure battery life, MobileMark 2012 measures battery life and performance simultaneously, showing how well a system design addresses the inherent tradeoffs between performance and power management.




Using the new Lenovo X1 Carbon Gen 3 as a test platform, we tested three M.2 SSDs with MobileMark 2012 1.5. Since each test takes over 10 hours, we only have a few results finished, but we're looking forward to testing other M.2 SSDs in the same system. M.2 SSDs run on 3.3 volts where mSATA and 2.5" SATA drives run on 5 volts.


We prefer to test power in a real-world setting and not just look at segmented power at extremes. A drive may have a set idle power consumption rating, but that doesn't determine the amount of power consumer over a period of time, since the time it takes to get to idle differs on each SSD, even when the same workload is ran.


After data goes to the SSD, the drive will shuffle the data around, drawing power while doing so. The same goes for maximum power consumption. One drive might pull more power to write the same file, but if that same drive is able to return to an idle state faster, it may consumer less power overall. Our notebook battery test takes all of that into consideration and set a boundary based on the amount of power in the battery.


The new Samsung SM951 delivers around 12 more minutes of notebook battery life over the previous-generation XP941. The tests were ran in compliance with Bapco's setup instructions so on battery power the system busses are reduced for maximum power savings.



Power Limited Performance




In the power limited state, both Samsung native PCIe M.2 drives delivered equal performance ratings. This doesn't surprise us since all of the system bussed are locked down for maximum power savings.


Each performance point has a heavy weight. We often measure 2.5" SSDs from both value and premium classes and only see a single point difference. Two points is actually quite a bit and shows that the two Samsung drives are very efficient when running in maximum power saving mode.

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