SamsungMZ-7KE256BW
SamsungMZ-7PD256BW

Controller: Samsung Triple Core MEX. Memory: Samsung 40nm MLC V-NAND. Release date: Q3 2014.

Controller: Samsung 3-core MDX. Flash Memory: Samsung 21nm Toggle Mode MLC. Release date: Q4 2012.

Real World Speed
Performance profile from 215,048 user samples
141,929 User Benchmarks
Best Bench: 124% 238GB free
Worst Bench: 71% 71GB free (System drive)
Poor: 71% Great: 124%
SPEED RANK: 256th / 1080
73,119 User Benchmarks
Best Bench: 116% 238GB free
Worst Bench: 68% 11GB free (System drive)
Poor: 68% Great: 116%
SPEED RANK: 287th / 1080
Effective Speed
Effective SSD Speed
102 % Slightly faster effective speed.
+7%
95 %
Read
Avg. Sequential Read Speed
469 MB/s +2% 459 MB/s
Write
Avg. Sequential Write Speed
396 MB/s Slightly faster write speed.
+8%
367 MB/s
4K Read
Avg. 4K Random Read Speed
33.9 MB/s Slightly faster random read.
+9%
31 MB/s
4K Write
Avg. 4K Random Write Speed
89.6 MB/s +5% 85.6 MB/s
Mixed
Avg. Sequential Mixed IO Speed
334 MB/s Faster mixed IO speed.
+10%
303 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed
44.1 MB/s Faster random mixed IO.
+12%
39.5 MB/s
SusWrite
Avg. Sustained Write Speed
346 MB/s Faster sustained write speed.
+11%
312 MB/s
Read
Peak Sequential Read Speed
515 MB/s +1% 510 MB/s
Write
Peak Sequential Write Speed
488 MB/s +2% 480 MB/s
4K Read
Peak 4K Random Read Speed
43.6 MB/s Faster peak random read.
+21%
36.1 MB/s
4K Write
Peak 4K Random Write Speed
125 MB/s Slightly faster peak random write.
+10%
114 MB/s
Mixed
Peak Sequential Mixed IO Speed
383 MB/s +4% 368 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed
56.7 MB/s Faster peak random mixed IO.
+19%
47.6 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average
484 MB/s +1% 477 MB/s
Market Share
Based on 76,154,691 SSDs tested
Market Share
Market Share (trailing 30 days)
0.09 % Hugely higher market share.
+125%
0.04 %
Value
Value For Money
11.1 % Much better value.
+35%
8.21 %
User Rating
UBM User Rating
54 % 54 %
Price
Price (score)
$129 Cheaper.
+26%
$175
Age
Newest
119 Months More recent.
+15%
140 Months
DQ Read
Peak 4K-64Thread Read Speed
388 MB/s +1% 385 MB/s
DQ Write
Peak 4K-64Thread Write Speed
361 MB/s Slightly faster peak deep queue write.
+8%
334 MB/s
AS-SSD Total
AS-SSD Total Score
1,280 Pts +5% 1,221 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
356 MB/s Hugely faster peak deep queue mixed IO.
+102%
176 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed
344 MB/s 346 MB/s +1%
ADQ Write
Avg. 4K-64Thread Write Speed
282 MB/s Slightly faster deep queue write.
+8%
262 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
295 MB/s Hugely faster deep queue mixed IO.
+101%
147 MB/s
Capacity
Capacity
256GB 256GB
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The 256GB Samsung 850 Pro is the fastest consumer SSD we have seen to date. Thanks to Samsung's new 3D V-NAND the 850 Pro has lower power consumption and better performance, albeit marginally, than both the 840 Evo and 840 Pro. Looking at the benchmark figures for the 840 and 850 Pros shows that the effective performance improvement is 10% whereas the 850 Pro beats the 840 Evo by 16%. These drives effectively saturate SATA 3.0 making it difficult to distinguish between them in day-to-day use. At current prices the 850 Pro is prohibitively expensive, prices need to drop by 15% before it approaches the 840 Pro from a value perspective. Samsung may release a value orientated 850 Evo soon, but for now "most" users are better off with the 840 Pro. [Oct '14 SSDrivePro]

MORE DETAILS

The 840 Pro is stunning. Samsung have created a completely in-house package including both the controller and their own new 21nm toggle mode NAND. On release (Oct '12) this was the fastest performing deep queue depth consumer grade SSD available. Fast forward six months (Apr '13) and the 840 Pro still holds both the random read/write deep queue depth speed records of 384 MB/s and 326 MB/s, impressive considering how fast the SSD space tends to move. There are no obvious weaknesses, in-fact the 840 pro takes first place in nearly all of the speed categories and is only seriously rivalled by one drive, the OCZ Vector. To conclude, in terms of both outright performance, particularly server orientated, and value for money the 256GB and 128GB 840 Pros are amongst the top handful of drives currently available. [Jun '13 SSDrivePro]

MORE DETAILS

Solid State Drive Rankings (Price vs Performance) June 2024 SSD Rankings

Welcome to our SSD comparison. We calculate effective speed for both SATA and NVMe drives based on real world performance then adjust by current prices per GB to yield a value for money rating. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top SSDs. [SSDrivePro]

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