The Samsung 850 EVO 4TB SSD Review

ATTO

ATTO's Disk Benchmark is a quick and easy freeware tool to measure drive performance across various transfer sizes.

Samsung 850 EVO 4TBSamsung 850 EVO 2TBSamsung 850 EVO 1TBSamsung 850 EVO 500GBSamsung 850 EVO 250GBSamsung 850 EVO 120GBSamsung 850 Pro 512GBSamsung 850 Pro 1TBSamsung 850 Pro 2TBADATA Premier SP550 120GBADATA Premier SP550 240GBADATA Premier SP550 480GBADATA XPG SX930 120GBADATA XPG SX930 240GBADATA XPG SX930 480GBCorsair Neutron XT 480GBCrucial BX100 120GBCrucial BX100 250GBCrucial BX100 500GBCrucial BX100 1TBCrucial BX200 480GBCrucial BX200 960GBCrucial MX100 512GBCrucial MX200 250GBCrucial MX200 500GBCrucial MX200 1TBCrucial MX300 750GBIntel 540s 480GBOCZ Trion 100 240GBOCZ Trion 100 480GBOCZ Trion 100 960GBOCZ Trion 150 240GBOCZ Trion 150 480GBOCZ Trion 150 960GBOCZ Vector 180 240GBOCZ Vector 180 480GBOCZ Vector 180 960GBPlextor M6V 256GBPNY CS1311 120GBPNY CS1311 240GBPNY CS1311 480GBPNY CS2211 240GBPNY CS2211 480GBSamsung 750 EVO 120GBSamsung 750 EVO 250GBSamsung 850 EVO M.2 120GBSamsung 850 EVO mSATA 250GBSamsung 850 EVO M.2 500GBSanDisk Extreme Pro 480GBSanDisk Extreme Pro 960GBSanDisk Ultra II 240GBSanDisk X400 1TBToshiba Q300 480GBIntel SSD 750 1.2TB (PCIe 3.0 x4 - NVMe)OCZ RD400A 256GBOCZ RD400A 1TBSamsung SM951 512GB (PCIe 3.0 x4 - AHCI)Samsung XP941 512GB (PCIe 2.0 x4 - AHCI)Samsung 950 Pro 256GBSamsung 950 Pro 512GB

The ATTO plot for the 4TB 850 EVO shows no problems and very slightly better read speeds than the 2TB 850 EVO.

AS-SSD

AS-SSD is another quick and free benchmark tool. It uses incompressible data for all of its tests, making it an easy way to keep an eye on which drives are relying on transparent data compression. The short duration of the test makes it a decent indicator of peak drive performance.

As expected, the AS-SSD results are unremarkable. Even if the new V-NAND were slower, the 4TB drive has more than enough parallelism to provide peak performance that saturates the SATA link.

Idle Power Consumption

Since the ATSB tests based on real-world usage cut idle times short to 25ms, their power consumption scores paint an inaccurate picture of the relative suitability of drives for mobile use. During real-world client use, a solid state drive will spend far more time idle than actively processing commands. Our testbed doesn't support the deepest DevSlp power saving mode that SATA drives can implement, but we can measure the power usage in the intermediate slumber state where both the host and device ends of the SATA link enter a low-power state and the drive is free to engage its internal power savings measures.

We also report the drive's idle power consumption while the SATA link is active and not in any power saving state. Drives are required to be able to wake from the slumber state in under 10 milliseconds, but that still leaves plenty of room for them to add latency to a burst of I/O. Because of this, many desktops default to either not using SATA Aggressive Link Power Management (ALPM) at all or to only enable it partially without making use of the device-initiated power management (DIPM) capability. Additionally, SATA Hot-Swap is incompatible with the use of DIPM, so our SSD testbed usually has DIPM turned off during performance testing.

The 4TB EVO has slightly lower idle power consumption than the 2TB EVO, but both still draw twice as much power in the slumber state as the smaller 850 EVOs with the MEX and MGX controllers.