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SanDiskSD6SF1M-256G-1022
SamsungMZ-7PD256BW
▲ 501 ▼

Controller: Marvell 9175. Flash Memory: SanDisk 19nm Toggle Mode MLC. Release date ≈ Q2 2014.

VS
▲ 5420,555 ▼

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

Effective Speed 
+30%
Real World Speed
Performance profile from 73,423 user samples
Benchmark your SSD here
304 User Benchmarks
Best Bench: 91% 238GB free
Worst Bench: 53% 15GB free (System drive)
Poor: 53% Great: 91%
SPEED RANK: 623rd / 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 		72.9 % 95 % Much faster effective speed.
+30%
Average Score 
+30%
Read
Avg. Sequential Read Speed 		411 MB/s 459 MB/s Faster read speed.
+12%
Write
Avg. Sequential Write Speed 		329 MB/s 367 MB/s Faster write speed.
+12%
4K Read
Avg. 4K Random Read Speed 		23.2 MB/s 31 MB/s Much faster random read.
+34%
4K Write
Avg. 4K Random Write Speed 		59.4 MB/s 85.6 MB/s Much faster random write.
+44%
Mixed
Avg. Sequential Mixed IO Speed 		242 MB/s 303 MB/s Faster mixed IO speed.
+25%
4K Mixed
Avg. 4K Random Mixed IO Speed 		22 MB/s 39.5 MB/s Much faster random mixed IO.
+80%
SusWrite
Avg. Sustained Write Speed 		292 MB/s 312 MB/s Slightly faster sustained write speed.
+7%
Peak Score 
+16%
Read
Peak Sequential Read Speed 		466 MB/s 510 MB/s Slightly faster peak read speed.
+9%
Write
Peak Sequential Write Speed 		421 MB/s 480 MB/s Faster peak write speed.
+14%
4K Read
Peak 4K Random Read Speed 		31.4 MB/s 36.1 MB/s Faster peak random read.
+15%
4K Write
Peak 4K Random Write Speed 		97 MB/s 114 MB/s Faster peak random write.
+18%
Mixed
Peak Sequential Mixed IO Speed 		375 MB/s +2% 368 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		33.4 MB/s 47.6 MB/s Much faster peak random mixed IO.
+43%
SusWrite
Peak Sequential Sustained Write 60s Average 		404 MB/s 477 MB/s Faster peak sustained write speed.
+18%
Value & Sentiment 
+∞%
Market Share
Based on 76,178,759 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0 % 0.13 % Insanely higher market share.
+∞%
Value
Value For Money 		7.07 % 8.21 % Better value.
+16%
User Rating
UBM User Rating 		50 % 54 % Slightly more popular.
+8%
Price
Price (score) 		$150 Cheaper.
+14% 		$175
Nice To Haves 
+38%
Age
Newest 		120+ Months More recent.
+14% 		140 Months
DQ Read
Peak 4K-64Thread Read Speed 		322 MB/s 385 MB/s Faster peak deep queue read.
+20%
DQ Write
Peak 4K-64Thread Write Speed 		211 MB/s 334 MB/s Much faster peak deep queue write.
+58%
AS-SSD Total
AS-SSD Total Score 		964 Pts 1,221 Pts Stronger server IO.
+27%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		125 MB/s 176 MB/s Much faster peak deep queue mixed IO.
+41%
ADQ Read
Avg. 4K-64Thread Read Speed 		237 MB/s 346 MB/s Much faster deep queue read.
+46%
ADQ Write
Avg. 4K-64Thread Write Speed 		178 MB/s 262 MB/s Much faster deep queue write.
+47%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		82.6 MB/s 147 MB/s Much faster deep queue mixed IO.
+78%
Specifications 
Capacity
Capacity 		256GB 256GB
Conclusion 
Average Bench 72.9%
Average Bench 95%
ADVERTISEMENT

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]

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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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  • Fastest real world speed - Real World Speed measures performance for typical consumers.
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 Frequently Asked Questions

Storage Devices FAQ
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What is 3D XPoint and how fast is it?
What’s the difference between SATA, PCIe and NVMe?
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Solid State Drives
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What is 4K 64 thread write speed?
Can CPU power saving states (C1,C2,C3) impact SSD speed?
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