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SamsungMZ-7TD250BW
OCZVTX4-25SAT3-128G
▲ 521,153 ▼

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

VS
▲ 53584 ▼

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

Effective Speed 
+27%
Real World Speed
Performance profile from 61,370 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
19,372 User Benchmarks
Best Bench: 104% 95GB free
Worst Bench: 64% 14GB free (System drive)
Poor: 64% Great: 104%
SPEED RANK: 366th / 1080
Effective Speed
Effective SSD Speed 		69.6 % 88.3 % Faster effective speed.
+27%
Average Score 
+46%
Read
Avg. Sequential Read Speed 		415 MB/s Slightly faster read speed.
+7% 		388 MB/s
Write
Avg. Sequential Write Speed 		190 MB/s 350 MB/s Hugely faster write speed.
+84%
4K Read
Avg. 4K Random Read Speed 		26.1 MB/s 26.2 MB/s +0%
4K Write
Avg. 4K Random Write Speed 		71.3 MB/s 96.1 MB/s Much faster random write.
+35%
Mixed
Avg. Sequential Mixed IO Speed 		150 MB/s 268 MB/s Much faster mixed IO speed.
+79%
4K Mixed
Avg. 4K Random Mixed IO Speed 		22.5 MB/s 35.5 MB/s Much faster random mixed IO.
+58%
SusWrite
Avg. Sustained Write Speed 		174 MB/s 298 MB/s Much faster sustained write speed.
+71%
Peak Score 
+37%
Read
Peak Sequential Read Speed 		485 MB/s Slightly faster peak read speed.
+6% 		457 MB/s
Write
Peak Sequential Write Speed 		254 MB/s 393 MB/s Much faster peak write speed.
+55%
4K Read
Peak 4K Random Read Speed 		30.2 MB/s 30.4 MB/s +1%
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 302 MB/s Much faster peak mixed IO speed.
+72%
4K Mixed
Peak 4K Random Mixed IO Speed 		26.3 MB/s 42 MB/s Much faster peak random mixed IO.
+60%
SusWrite
Peak Sequential Sustained Write 60s Average 		248 MB/s 381 MB/s Much faster peak sustained write speed.
+54%
Value & Sentiment 
+50%
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 % Better value.
+16% 		3.89 %
User Rating
UBM User Rating 		52 % 53 % +2%
Price
Price (score) 		$251 $215 Cheaper.
+14%
Nice To Haves 
+124%
Age
Newest 		140 Months +4% 146 Months
DQ Read
Peak 4K-64Thread Read Speed 		369 MB/s Slightly faster peak deep queue read.
+5% 		350 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		219 MB/s 354 MB/s Much faster peak deep queue write.
+62%
AS-SSD Total
AS-SSD Total Score 		1,022 Pts 1,176 Pts Stronger server IO.
+15%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		59.3 MB/s 331 MB/s Hugely faster peak deep queue mixed IO.
+458%
ADQ Read
Avg. 4K-64Thread Read Speed 		318 MB/s +4% 307 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		161 MB/s 274 MB/s Much faster deep queue write.
+70%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		54.9 MB/s 275 MB/s Hugely faster deep queue mixed IO.
+401%
Specifications 
Capacity
Capacity 		250GB 128GB
Conclusion 
Average Bench 69.6%
Average Bench 88.3%
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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 128GB Vertex 4 has an average score of 90.5% which is the highest we have seen to date for a 120-128GB SSD. We have in excess of 100 UBM samples for the Vertex 4 and they show that the 128GB Vertex 4 performs superbly outside the lab. With peak sequential read/write speeds of 508/391 and averages of 398/325 MB/s the Vertex 4 manages to average around 75% of its peak sequential speeds, a very impressive result. The Vertex 4 was superseded by the OCZ Vertex 450 several months ago. OCZ release new versions with minor tweaks approximately every six months. Comparing the Vertex 450 to the Vertex 4 shows that the move to 20nm flash and a new Indilinx controller has reduced overall performance by around 15%, so the older Vertex 4 is actually faster than its successor. [Feb '14 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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