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SamsungMZ-7TD250BW
OCZVTX4-25SAT3-256G
▲ 521,153 ▼

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

VS
▲ 531,525 ▼

Controller: Indilinx Everest 2 IDX400M00-BC. Flash Memory: Intel Synchronous 25nm MLC. Release date: Q2 2012.

Effective Speed 
+31%
Real World Speed
Performance profile from 54,353 user samples
Benchmark your SSD here
41,998 User Benchmarks
Best Bench: 85% 214GB free
Worst Bench: 51% 160GB free (System drive)
Poor: 51% Great: 85%
SPEED RANK: 685th / 1080
12,355 User Benchmarks
Best Bench: 106% 238GB free
Worst Bench: 68% 26GB free
Poor: 68% Great: 106%
SPEED RANK: 322nd / 1080
Effective Speed
Effective SSD Speed 		69.6 % 90.8 % Much faster effective speed.
+31%
Average Score 
+52%
Read
Avg. Sequential Read Speed 		415 MB/s Faster read speed.
+11% 		375 MB/s
Write
Avg. Sequential Write Speed 		190 MB/s 392 MB/s Hugely faster write speed.
+106%
4K Read
Avg. 4K Random Read Speed 		26.1 MB/s 27.4 MB/s +5%
4K Write
Avg. 4K Random Write Speed 		71.3 MB/s 90.8 MB/s Faster random write.
+27%
Mixed
Avg. Sequential Mixed IO Speed 		150 MB/s 266 MB/s Much faster mixed IO speed.
+77%
4K Mixed
Avg. 4K Random Mixed IO Speed 		22.5 MB/s 34.5 MB/s Much faster random mixed IO.
+53%
SusWrite
Avg. Sustained Write Speed 		174 MB/s 363 MB/s Hugely faster sustained write speed.
+109%
Peak Score 
+47%
Read
Peak Sequential Read Speed 		485 MB/s Slightly faster peak read speed.
+6% 		456 MB/s
Write
Peak Sequential Write Speed 		254 MB/s 460 MB/s Hugely faster peak write speed.
+81%
4K Read
Peak 4K Random Read Speed 		30.2 MB/s 33.7 MB/s Faster peak random read.
+12%
4K Write
Peak 4K Random Write Speed 		103 MB/s 132 MB/s Faster peak random write.
+28%
Mixed
Peak Sequential Mixed IO Speed 		176 MB/s 316 MB/s Much faster peak mixed IO speed.
+80%
4K Mixed
Peak 4K Random Mixed IO Speed 		26.3 MB/s 41.4 MB/s Much faster peak random mixed IO.
+57%
SusWrite
Peak Sequential Sustained Write 60s Average 		248 MB/s 448 MB/s Hugely faster peak sustained write speed.
+81%
Value & Sentiment 
+60%
Market Share
Based on 76,251,979 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.03 % Hugely higher market share.
+200% 		0.01 %
Value
Value For Money 		4.5 % Slightly better value.
+6% 		4.23 %
User Rating
UBM User Rating 		52 % 53 % +2%
Price
Price (score) 		$251 Much cheaper.
+37% 		$400
Nice To Haves 
+126%
Age
Newest 		140 Months +4% 146 Months
DQ Read
Peak 4K-64Thread Read Speed 		369 MB/s Slightly faster peak deep queue read.
+7% 		345 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		219 MB/s 357 MB/s Much faster peak deep queue write.
+63%
AS-SSD Total
AS-SSD Total Score 		1,022 Pts 1,188 Pts Stronger server IO.
+16%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		59.3 MB/s 336 MB/s Hugely faster peak deep queue mixed IO.
+467%
ADQ Read
Avg. 4K-64Thread Read Speed 		318 MB/s Slightly faster deep queue read.
+5% 		302 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		161 MB/s 277 MB/s Much faster deep queue write.
+72%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		54.9 MB/s 278 MB/s Hugely faster deep queue mixed IO.
+406%
Specifications 
Capacity
Capacity 		250GB 256GB
Conclusion 
Average Bench 69.6%
Average Bench 90.8%
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The Samsung 840 is the budget version of the 840 Pro, the main difference between the hardware on the two drives is the type of flash memory used. The cheaper 840 uses TLC NAND which is cheaper than the MLC found in the Pro version of this drive. The performance hit as a result of the cheaper TLC memory is approximately 30%. The 840 delvers both average real world speeds (435 MB/s) and average enterprise speeds (AS-SSD Total Score 920). The relative weak spots in this drives performance profile are its write ability, where it scores just 254 MB/s in the sequential write test. The upside to the lost performance over the Pro version is a significant reduction in price which leaves this drive an average value for money proposition at its current price of £135. There are, however, better value drives to be had elsewhere including Samsungs own newly released EVO which effectively supersedes the 840. [Aug '13 SSDrivePro]

MORE DETAILS

The Vertex 4 is just over a year old but thanks to its recent firmware update (1.5), it still manages to perform almost on a par with the best drives currently available. One of the striking aspects of the Vertex is its well-rounded performance profile. With an AS-SSD score of 1137 and a real world speed of 548 the Vertex 4 is able to cope extremely well with both server and consumer type workloads. This drive uses the new Indilux Everest 2 controller, which unlike the previous generations of this drive which used a SandForce controller, is able to cope admirably with both compressible and incompressible data. Overall, the Vertex 4 is a great performing SSD that said, there are better value for money (and younger) drives available, including the Vertex 4's own successor, the OCZ Vector. [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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 Frequently Asked Questions

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Solid State Drives
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