Page 14 from comparison Adata Legend 840 Nvme M2 1Tb

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Feature	Adata Legend 840 Nvme M2 1Tb	Samsung 980 Pro Nvme M2 250Gb
Memory Usage Type	Internal	Internal
Memory Connection Port
Storage Connection Details
Device Design and Dimensions
Memory Capacity		1 terabyte (tb)
Flash Memory Specifications
Controller
Sequential Read Speed	6400 megabytes per second (mb/s)	5000 megabytes per second (mb/s)
Sequential Write Speed	2700 megabytes per second (mb/s)	4500 megabytes per second (mb/s)
Random Read Speed
Random Write Speed
DRAM Memory	true	false
DRAM Memory Type		-
Operating Temperature Range		0 to 70 degrees Celsius
Operating Voltage	3.3 volt (v)	-
Average Lifespan	1,500,000 hours (MTBF) / 150 Terabytes Written (TBW)	2,000,000 hours (MTBF) / 650 Terabytes Written (TBW)
Power Consumption		-
NCQ Support	false	false
TRIM Support	true	false
RAID Support	false	false
S.M.A.R.T Support	true	true
Encryption Technology
Size and Dimensions	2.38 * 22.15 * 80.15 millimeter (mm)	3.13 × 22 × 80 mm with heatsink / 2.15 × 22 × 80 mm without heatsink
Product Weight	9 gram (g)	9g with heatsink ** 6g without heatsink
LED Status Indicator	false	false