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SamsungMZ-75E250B
SamsungMZ-7PD256BW
▲ 5640,704 ▼

Controller: Samsung Dual Core MGX. Memory: Samsung 40nm TLC V-NAND. Release date: Q4 2014.

VS
▲ 5420,557 ▼

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

Effective Speed 
+9%
Real World Speed
Performance profile from 1,024,710 user samples
Benchmark your SSD here
951,591 User Benchmarks
Best Bench: 124% 140GB free
Worst Bench: 72% 233GB free
Poor: 72% Great: 124%
SPEED RANK: 251st / 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 		103 % Slightly faster effective speed.
+9% 		95 %
Average Score 
+12%
Read
Avg. Sequential Read Speed 		466 MB/s +2% 459 MB/s
Write
Avg. Sequential Write Speed 		434 MB/s Faster write speed.
+18% 		367 MB/s
4K Read
Avg. 4K Random Read Speed 		39.4 MB/s Faster random read.
+27% 		31 MB/s
4K Write
Avg. 4K Random Write Speed 		94.6 MB/s Faster random write.
+11% 		85.6 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		370 MB/s Faster mixed IO speed.
+22% 		303 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		52.2 MB/s Much faster random mixed IO.
+32% 		39.5 MB/s
SusWrite
Avg. Sustained Write Speed 		247 MB/s 312 MB/s Faster sustained write speed.
+26%
Peak Score 
+7%
Read
Peak Sequential Read Speed 		507 MB/s 510 MB/s +1%
Write
Peak Sequential Write Speed 		492 MB/s +2% 480 MB/s
4K Read
Peak 4K Random Read Speed 		47.6 MB/s Much faster peak random read.
+32% 		36.1 MB/s
4K Write
Peak 4K Random Write Speed 		129 MB/s Faster peak random write.
+13% 		114 MB/s
Mixed
Peak Sequential Mixed IO Speed 		416 MB/s Faster peak mixed IO speed.
+13% 		368 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		64.6 MB/s Much faster peak random mixed IO.
+36% 		47.6 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		328 MB/s 477 MB/s Much faster peak sustained write speed.
+45%
Value & Sentiment 
+347%
Market Share
Based on 77,602,843 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.69 % Insanely higher market share.
+1,280% 		0.05 %
Value
Value For Money 		13.4 % Much better value.
+63% 		8.21 %
User Rating
UBM User Rating 		56 % +4% 54 %
Price
Price (score) 		$100 Much cheaper.
+43% 		$175
Nice To Haves 
+35%
Age
Newest 		119 Months More recent.
+18% 		145 Months
DQ Read
Peak 4K-64Thread Read Speed 		386 MB/s +0% 385 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		362 MB/s Slightly faster peak deep queue write.
+8% 		334 MB/s
AS-SSD Total
AS-SSD Total Score 		1,290 Pts Slightly stronger server IO.
+6% 		1,221 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		370 MB/s Hugely faster peak deep queue mixed IO.
+110% 		176 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		354 MB/s +2% 346 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		308 MB/s Faster deep queue write.
+18% 		262 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		320 MB/s Hugely faster deep queue mixed IO.
+118% 		147 MB/s
Specifications 
Capacity
Capacity 		250GB 256GB
Conclusion 
Average Bench 103%
Average Bench 95%

The 250GB Samsung 850 Evo has a similar architecture to its hugely successful predecessor, the 840 Evo. Both drives are TLC based but the 850 uses 3D V-NAND as opposed to regular NAND. Both drives also feature a Turbowrite cache (TWC) which buffers up to 3GB of writes. The TWC enables high burst write speeds but when the cache exhausts write speeds drop to 300 MB/s. Comparing the 850 and 840 Evos shows that effective speed, has improved by 11% and the warranty has been extended from three to five years but prices are also up by 11%. The 850 Evo does put in superb benchmarks (second only to the 850 Pro) but these are only valid within the TWC. At current price levels the 850 Evo struggles to compete with the value leaders. [Dec '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

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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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Solid State Drives
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