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Samsung XP941 256GB Ultra M.2 PCIe SSD Review

By: Chris Ramseyer | SSDs in Storage | Posted: Sep 2, 2014 4:38 pm
TweakTown Rating: 92%Manufacturer: Samsung

Mixed Read / Write Workloads

 

In this series of tests, we measure mixed workload performance. We start with 100% read and then add data writes to the mix until we get to 100% writes, in 10% increments. We believe this will be the next major area SSD manufactures will address after performance consistency.

 

Mixed Workload Bandwidth

 

samsung_xp941_256gb_ultra_m_2_pcie_ssd_review_61

 

At this time, all of the consumer M.2 PCIe drives use the AHCI command set. AHCI is only half-duplex, so the drive can only read or write at one time, but not both at the same time. NVMe SSDs are full duplex and will be able to read and write at the same time.

 

80% Read / 20% Write Bandwidth

 

samsung_xp941_256gb_ultra_m_2_pcie_ssd_review_62

 

For consumer workloads, we use the 80% read / 20% write point to measure performance. Oddly enough, the 256GB model is a bit slower than the 128GB when we measure at 80/20. We ran both drives through the test three times and got the same results each time.

 

Random Mixed IO

 

samsung_xp941_256gb_ultra_m_2_pcie_ssd_review_63

 

In this test, we use random data in a 50/50 workload. Here you can see the 256GB XP941 outperforming the 128GB model. Also, until now, the 512GB model was only a little faster than the 256GB XP941, but in this test, the 512GB model is quite a bit faster.

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