SSDBoss Review Our evaluation of Extreme SSD vs 840 Pro

read performance

How quickly data is read from the drive

4K Random Read, 4K Random Read Access Time and 512K Sequential Read

write performance

How quickly data is written to the drive

4K Random Write, 4K Random Write Access Time and 512K Sequential Write

real world benchmarks

How well the drive performs common tasks

Windows 7 Boot-up Time, Photoshop Lens Filter and AS SSD ISO Copy

Benchmarks

How well the drive performs on common benchmarks

Passmark Disk Rating, PCMark Vantage and AS SSD Score

No winner declared

Too close to call

Differences What are the advantages of each

Front view of SanDisk Extreme SSD

Reasons to consider the
SanDisk Extreme SSD

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Higher MTBF 2,000,000 hours vs 1,500,000 hours Around 35% higher MTBF
Front view of Samsung 840 Pro

Reasons to consider the
Samsung 840 Pro

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Significantly faster 4k random read 311.34 MB/s vs 123.46 MB/s More than 2.5x faster 4k random read
Higher capacity 512 GB vs 240 GB Around 2.2x higher capacity
Significantly larger cache 256 MB vs 0 MB Compared to all SSDs, 256 MB cache is just OK
Faster windows 7 boot-up time 7.8 s vs 9.6 s Around 20% faster windows 7 boot-up time
Higher AS SSD score 1,143 pts vs 761 pts More than 50% higher AS SSD score
Significantly lower 4k random read access time 0.8 ms vs 2.02 ms 2.5x lower 4k random read access time
Significantly lower avg. power consumption 2 Watts vs 2.68 Watts More than 25% lower avg. power consumption
Lighter 53 g vs 68 g More than 20% lighter
Slightly higher PCMark vantage score 25,929 pts vs 24,620 pts More than 5% higher PCMark vantage score
Thinner thickness 7 mm vs 10 mm Around 30% thinner thickness

Benchmarks Real world tests of Extreme SSD vs 840 Pro

4K Random Read

Extreme SSD
123.46 MB/s
840 Pro
311.34 MB/s

4K Random Write

Extreme SSD
119.02 MB/s
840 Pro
130.58 MB/s

Windows 7 Boot-up Time

Extreme SSD
9.6 s
840 Pro
7.8 s

Avg. Power Consumption

Extreme SSD
2.68 Watts
840 Pro
2 Watts

4K Random Read Access Time

Extreme SSD
2.1 ms
840 Pro
1.91 ms

4K Random Write Access Time

Extreme SSD
2.02 ms
840 Pro
0.8 ms

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