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SamsungMZ-7PD128BW
SamsungMZ-7TE250BW
▲ 542,764 ▼

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

VS
▲ 5335,450 ▼

Controller: Samsung 3 Core MEX. Memory: Samsung 19nm Toggle Mode TLC. Release date: Q3 2013.

Effective Speed 
+7%
Real World Speed
Performance profile from 251,957 user samples
Benchmark your SSD here
34,842 User Benchmarks
Best Bench: 110% 62GB free
Worst Bench: 62% 119GB free
Poor: 62% Great: 110%
SPEED RANK: 344th / 1080
217,115 User Benchmarks
Best Bench: 118% 68GB free
Worst Bench: 64% 231GB free
Poor: 64% Great: 118%
SPEED RANK: 284th / 1080
Effective Speed
Effective SSD Speed 		89.5 % 95.9 % Slightly faster effective speed.
+7%
Average Score 
+10%
Read
Avg. Sequential Read Speed 		444 MB/s 465 MB/s +5%
Write
Avg. Sequential Write Speed 		336 MB/s 394 MB/s Faster write speed.
+17%
4K Read
Avg. 4K Random Read Speed 		30.5 MB/s 38.8 MB/s Faster random read.
+27%
4K Write
Avg. 4K Random Write Speed 		81.6 MB/s 85.3 MB/s +5%
Mixed
Avg. Sequential Mixed IO Speed 		268 MB/s 347 MB/s Faster mixed IO speed.
+29%
4K Mixed
Avg. 4K Random Mixed IO Speed 		35.9 MB/s 48 MB/s Much faster random mixed IO.
+34%
SusWrite
Avg. Sustained Write Speed 		286 MB/s Much faster sustained write speed.
+47% 		195 MB/s
Peak Score 
+9%
Read
Peak Sequential Read Speed 		497 MB/s 507 MB/s +2%
Write
Peak Sequential Write Speed 		445 MB/s 489 MB/s Slightly faster peak write speed.
+10%
4K Read
Peak 4K Random Read Speed 		36.3 MB/s 46.7 MB/s Faster peak random read.
+29%
4K Write
Peak 4K Random Write Speed 		113 MB/s 119 MB/s Slightly faster peak random write.
+5%
Mixed
Peak Sequential Mixed IO Speed 		331 MB/s 418 MB/s Faster peak mixed IO speed.
+26%
4K Mixed
Peak 4K Random Mixed IO Speed 		44.1 MB/s 59.8 MB/s Much faster peak random mixed IO.
+36%
SusWrite
Peak Sequential Sustained Write 60s Average 		440 MB/s Much faster peak sustained write speed.
+47% 		299 MB/s
Value & Sentiment 
+125%
Market Share
Based on 77,608,390 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.04 % 0.17 % Hugely higher market share.
+325%
Value
Value For Money 		5.17 % 12.5 % Hugely better value.
+142%
User Rating
UBM User Rating 		54 % +2% 53 %
Price
Price (score) 		$150 $99 Much cheaper.
+34%
Nice To Haves 
+20%
Age
Newest 		145 Months 136 Months Slightly more recent.
+6%
DQ Read
Peak 4K-64Thread Read Speed 		376 MB/s 383 MB/s +2%
DQ Write
Peak 4K-64Thread Write Speed 		330 MB/s 362 MB/s Slightly faster peak deep queue write.
+10%
AS-SSD Total
AS-SSD Total Score 		1,196 Pts 1,273 Pts Slightly stronger server IO.
+6%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		155 MB/s 237 MB/s Much faster peak deep queue mixed IO.
+53%
ADQ Read
Avg. 4K-64Thread Read Speed 		332 MB/s 337 MB/s +2%
ADQ Write
Avg. 4K-64Thread Write Speed 		245 MB/s 293 MB/s Faster deep queue write.
+20%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		126 MB/s 203 MB/s Much faster deep queue mixed IO.
+61%
Specifications 
Capacity
Capacity 		128GB 250GB
Conclusion 
Average Bench 89.5%
Average Bench 95.9%

The 128GB 840 Pro is a rock solid performer. On release, nearly a year and a half ago, the Pro smashed several speed records. Today, with sequential read/write speeds of 519/438 MBps, the Pro is still one of the fastest SSDs available. One of the Pro's top competitors is Samsungs own, newer 840 Evo. Looking at a raw synthetic speed comparison of the 128GB Pro and Evo is a little misleading. On the face of it the Pro only has a marginal lead over the Evo. This due to the fact that the Evo can only maintain its burst write speed for transfers of up to 3GB, the size of its SLC cache. The Pro on the other hand can sustain higher throughputs indefinitely. The Pro also utilizes MLC which is rated for far more erase cycles than the TLC used in the Evo. Server IO is often continuous and would quickly exhaust the 3GB cache on the Evo but for typical consumer use the Evo will remain within the SLC cache most of the time. [Feb '14 SSDrivePro]

MORE DETAILS

The Evo is remarkable in that, like the Sandisk Extreme II, it features a second level cache. For the 250 GB Evo this consists of a 3 GB Turbowrite cache (TWC) which is a block of high speed Flash Memory. When the TWC is exhausted write speeds drop by approximately 50% but that won't often happen under typical consumer workloads. In terms of raw performance, even with its cache, the Evo still isn't the fastest drive. With a real world speed index reading of 439 MB/s the EVO is however, within reach of the two speed leaders (Vector and 850 Pro). At a price point of $130 the Evo is around 30% cheaper making it the best value for money SSDs I have seen in 2014. Comparing the Evo and the Sandisk Ultra Plus shows that the Evo is the winner but the Sandisk may be a viable alternative thanks to its cache-free, and therefore more consistent performance during extended writes. [Aug '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

Storage Devices FAQ
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Solid State Drives
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What is 4K 64 thread write speed?
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