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SamsungMZ-75E250B
SamsungMZ-7KE128BW
▲ 5640,704 ▼

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

VS
▲ 541,869 ▼

Controller: Samsung Triple Core MEX. Memory: Samsung 40nm MLC V-NAND. Release date: Q3 2014.

Effective Speed 
+5%
Real World Speed
Performance profile from 969,786 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
18,195 User Benchmarks
Best Bench: 119% 119GB free
Worst Bench: 71% 60GB free (System drive)
Poor: 71% Great: 119%
SPEED RANK: 268th / 1080
Effective Speed
Effective SSD Speed 		103 % +5% 98.7 %
Average Score 
+8%
Read
Avg. Sequential Read Speed 		466 MB/s 472 MB/s +1%
Write
Avg. Sequential Write Speed 		434 MB/s Slightly faster write speed.
+9% 		397 MB/s
4K Read
Avg. 4K Random Read Speed 		39.4 MB/s Faster random read.
+22% 		32.3 MB/s
4K Write
Avg. 4K Random Write Speed 		94.6 MB/s Slightly faster random write.
+6% 		88.9 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		370 MB/s Faster mixed IO speed.
+23% 		301 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		52.2 MB/s Much faster random mixed IO.
+30% 		40 MB/s
SusWrite
Avg. Sustained Write Speed 		247 MB/s 336 MB/s Much faster sustained write speed.
+36%
Peak Score 
+6%
Read
Peak Sequential Read Speed 		507 MB/s 516 MB/s +2%
Write
Peak Sequential Write Speed 		492 MB/s +3% 479 MB/s
4K Read
Peak 4K Random Read Speed 		47.6 MB/s Faster peak random read.
+26% 		37.8 MB/s
4K Write
Peak 4K Random Write Speed 		129 MB/s Slightly faster peak random write.
+8% 		120 MB/s
Mixed
Peak Sequential Mixed IO Speed 		416 MB/s Faster peak mixed IO speed.
+17% 		356 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		64.6 MB/s Much faster peak random mixed IO.
+36% 		47.4 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		328 MB/s 473 MB/s Much faster peak sustained write speed.
+44%
Value & Sentiment 
+844%
Market Share
Based on 77,606,037 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.7 % Insanely higher market share.
+3,400% 		0.02 %
Value
Value For Money 		13.4 % Better value.
+15% 		11.6 %
User Rating
UBM User Rating 		56 % +4% 54 %
Price
Price (score) 		$100 $58 Much cheaper.
+42%
Nice To Haves 
+5%
Age
Newest 		119 Months +4% 124 Months
DQ Read
Peak 4K-64Thread Read Speed 		386 MB/s 389 MB/s +1%
DQ Write
Peak 4K-64Thread Write Speed 		362 MB/s +1% 360 MB/s
AS-SSD Total
AS-SSD Total Score 		1,290 Pts +2% 1,263 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		370 MB/s Faster peak deep queue mixed IO.
+11% 		332 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		354 MB/s +3% 343 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		308 MB/s Slightly faster deep queue write.
+5% 		292 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		320 MB/s Faster deep queue mixed IO.
+16% 		276 MB/s
Specifications 
Capacity
Capacity 		250GB 128GB
Conclusion 
Average Bench 103%
Average Bench 98.7%

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]

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