Differences What are the advantages of each

Front view of Samsung 840 Pro

Reasons to consider the
Samsung 840 Pro

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Significantly higher capacity 512 GB vs 240 GB Around 2.2x higher capacity
Lighter 53 g vs 80 g Around 35% lighter
Higher MTBF 1,500,000 hours vs 1,200,000 hours 25% higher MTBF
Thinner thickness 7 mm vs 10 mm More than 25% thinner thickness
Front view of PNY XLR8 Pro

Reasons to consider the
PNY XLR8 Pro

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Slightly more capacity per dollar 1.92 GB/$ vs 1.77 GB/$ Around 10% more capacity per dollar

Reviews Word on the street

840 Pro  vs XLR8 Pro 

8.0
8.0
So the big difference in terms of performance you can likely trace to the flash memory in each drive.
840 Pro

Specifications Full list of technical specs

storage

840 Pro  vs
XLR8 Pro 
Capacity 512 GB 240 GB
Interface SATA III SATA III
Interface speed 6 Gbit/s 6 Gbit/s
Controller Samsung MDX SandForce 2281
Memory type MLC MLC

manufacturer performance

MTBF 1,500,000 hours 1,200,000 hours

form factor

840 Pro  vs
XLR8 Pro 
Form factor 2.5" 2.5"
Thickness 7 mm 10 mm
Weight 53 g 80 g

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