Differences What are the advantages of each

Front view of Seagate 600

Reasons to consider the
Seagate 600

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Slightly faster power consumption (Idle) 0.6 Watts vs 0.05 Watts Around 12x faster power consumption (Idle)
Front view of Samsung 840 Pro

Reasons to consider the
Samsung 840 Pro

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Lighter 53 g vs 77 g More than 30% lighter
Faster random read 100,000 IOPS vs 80,000 IOPS 25% faster random read
Faster sequential write 520 MB/s vs 400 MB/s 30% faster sequential write
Faster random write 90,000 IOPS vs 70,000 IOPS Around 30% faster random write
More capacity per dollar 1.65 GB/$ vs 1.45 GB/$ Around 15% more capacity per dollar
Faster sequential read 540 MB/s vs 500 MB/s Around 10% faster sequential read

Features Key features of the Seagate 600  vs 840 Pro 

random read

Seagate 600
80,000 IOPS
840 Pro
100,000 IOPS
The drives have admirable performance specifications of 550MB/s reads and 450MB/s writes and IOPS performance of 80,000/70,000 reads/writes respectively.
Seagate 600 | by Legit Reviews (Jun, 2013)

random write

Seagate 600
70,000 IOPS
840 Pro
90,000 IOPS
IOPS performance was very good as well, exceeding the 80,000/70,000 reads/writes by a bit to place in the upper portion of the comparison list.
Seagate 600 | by Legit Reviews (Jun, 2013)

sequential read

Seagate 600
500 MB/s
840 Pro
540 MB/s
It's performance has proven to be pretty darn good and without the need for compression of data to boost performance.
Seagate 600 | by Legit Reviews (Jun, 2013)

sequential write

Seagate 600
400 MB/s
840 Pro
520 MB/s
Benchmark Results: IOPS performance was very good, exceeding the published specification of 80K/70K read/writes by a modest margin and near the marks set by the best drives we've tested.
Seagate 600 | by Legit Reviews (Jun, 2013)

Reviews Word on the street

Seagate 600  vs 840 Pro 

9.3
9.2
Steady state performance is quite good, which means you don't have to worry as much about keeping some free space on the drive to maximize performance.
Seagate 600

8.0
8.0
Looking at the AS SSD benchmark, it's a similar story: 513MB/s reads and 437MB/s writes for the headline sequential performance.
Seagate 600

Overall

8.8 Out of 10
8.7 Out of 10

Specifications Full list of technical specs

storage

Seagate 600  vs
840 Pro 
Capacity 480 GB 512 GB
Interface SATA III SATA III
Interface speed 6 Gbit/s 6 Gbit/s
Controller LAMD LM87800 Samsung MDX
Memory type MLC MLC
NAND process size 19 nm 21 nm
Maximum shock force 1,500G 1,500G

form factor

Seagate 600  vs
840 Pro 
Form factor 2.5" 2.5"
Mfg warranty 3 years 5 years
Thickness 7 mm 7 mm
Weight 77 g 53 g

manufacturer performance

Sequential read 500 MB/s 540 MB/s
Sequential write 400 MB/s 520 MB/s
Random read 80,000 IOPS 100,000 IOPS
Random write 70,000 IOPS 90,000 IOPS
Power consumption (Idle) 0.6 Watts 0.05 Watts
Power consumption (Active) 0.75 Watts 0.35 Watts

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