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SamsungMZ-75E250B
AdataASP900S3-128GM-C
▲ 5640,704 ▼

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

VS
▲ 511,619 ▼

Controller: LSI SandForce SF2281. NAND Flash: Intel Micron Synchronous 25nm MLC. Release date: Q1 2012.

Effective Speed 
+51%
Real World Speed
Performance profile from 954,411 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
2,820 User Benchmarks
Best Bench: 80% 50GB free
Worst Bench: 57% 13GB free (System drive)
Poor: 57% Great: 80%
SPEED RANK: 697th / 1080
Effective Speed
Effective SSD Speed 		103 % Much faster effective speed.
+51% 		68.6 %
Average Score 
+76%
Read
Avg. Sequential Read Speed 		466 MB/s Faster read speed.
+23% 		380 MB/s
Write
Avg. Sequential Write Speed 		434 MB/s Hugely faster write speed.
+197% 		146 MB/s
4K Read
Avg. 4K Random Read Speed 		39.4 MB/s Much faster random read.
+43% 		27.5 MB/s
4K Write
Avg. 4K Random Write Speed 		94.6 MB/s Faster random write.
+16% 		81.6 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		370 MB/s Hugely faster mixed IO speed.
+95% 		190 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		52.2 MB/s Much faster random mixed IO.
+55% 		33.6 MB/s
SusWrite
Avg. Sustained Write Speed 		247 MB/s Hugely faster sustained write speed.
+104% 		121 MB/s
Peak Score 
+78%
Read
Peak Sequential Read Speed 		507 MB/s Faster peak read speed.
+18% 		428 MB/s
Write
Peak Sequential Write Speed 		492 MB/s Hugely faster peak write speed.
+193% 		168 MB/s
4K Read
Peak 4K Random Read Speed 		47.6 MB/s Much faster peak random read.
+49% 		32 MB/s
4K Write
Peak 4K Random Write Speed 		129 MB/s Faster peak random write.
+11% 		116 MB/s
Mixed
Peak Sequential Mixed IO Speed 		416 MB/s Hugely faster peak mixed IO speed.
+93% 		216 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		64.6 MB/s Much faster peak random mixed IO.
+57% 		41.1 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		328 MB/s Hugely faster peak sustained write speed.
+122% 		148 MB/s
Value & Sentiment 
+1,569%
Market Share
Based on 77,578,169 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.64 % Insanely higher market share.
+6,300% 		0.01 %
Value
Value For Money 		13.4 % Better value.
+25% 		10.7 %
User Rating
UBM User Rating 		56 % Slightly more popular.
+10% 		51 %
Price
Price (score) 		$100 $40 Much cheaper.
+60%
Nice To Haves 
+103%
Age
Newest 		119 Months More recent.
+22% 		152 Months
DQ Read
Peak 4K-64Thread Read Speed 		386 MB/s Hugely faster peak deep queue read.
+94% 		199 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		362 MB/s Hugely faster peak deep queue write.
+118% 		166 MB/s
AS-SSD Total
AS-SSD Total Score 		1,290 Pts Hugely stronger server IO.
+81% 		712 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		370 MB/s Hugely faster peak deep queue mixed IO.
+116% 		171 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		354 MB/s Hugely faster deep queue read.
+121% 		160 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		308 MB/s Hugely faster deep queue write.
+115% 		143 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		320 MB/s Hugely faster deep queue mixed IO.
+156% 		125 MB/s
Specifications 
Capacity
Capacity 		250GB 128GB
Conclusion 
Average Bench 103%
Average Bench 68.6%

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 128GB Adata Premier Pro SP900 has peak and average sequential read/write speeds of 496/166 and 175/106 MB/s. The average speeds are significantly worse than peak which indicates that the SP900 has an unstable performance profile. Additionally, the peak write speed of 166 MB/s is 90% below the group leaders. In terms of small file 4K read/write speeds things are a little better where the SP900 achieved peak and average scores of 23/83 and 17/29 MB/s. These 4K figures still lag the group leaders by around 40%. The Overall effective speed for the SP900 measures 340 MB/s, the worst I have seen to date on a 128GB SSD. The SP900 is not particularly well priced, and therefore represents poor value for money. There are both faster and cheaper 128GB alternatives available amongst the group leaders. [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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Solid State Drives
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