MC_K7 :
redeemer :
I would go for the Samsung 840 as its faster than the M4
The specs are pretty much the same, I don't know if there are any significant differences in benchmarks? Anyways, the main argument for me would be price because he seems to be on a budget and the Samsung 840 is a little cheaper.
Samsun 840
Sustained Sequential Read: 530 MB/s
Sustained Sequential Write: 240 MB/s
4KB Random Read: Up to 95,000 IOPS
4KB Random Write: Up to 44,000 IOPS
Crucial M4
Sustained Sequential Read: Up to 500 MB/s (SATA 6Gb/s)
Sustained Sequential Write: Up to 260 MB/s (SATA 6Gb/s)
4KB Random Read: Up to 45,000 IOPS
4KB Random Write: Up to 50,000 IOPS
Not to mention Samsung Toolbox software is superior