Quote:
Originally Posted by mesaone
Can it really? I have a question, because I'm always wary of quoted speeds - and I only have a tenuous grasp of how this stuff works.
On paper, SATA II bandwidth is 3 Gbps. Also on paper, those Samsung Pro 840 drives are 540 MB/s read and 520 MB/s write... 4320 and 4160 Mbps, respectively. So on paper the SSD has read and write speeds that do exceed SATA II bandwidth. In a real-world scenario, does SATA II ever actually bottleneck SSD?
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Yes it can, otherwise I would not have said it can
SATA II is 3.0 Gbps and uses 10/8 symbol encoding (SATA III uses lower overhead encoding as well as having twice the wire data rate). So you get an absolute maximum actual data transfer rate for SATA II of...
3.0 * ( 8 /10 ) / 8 (bit/byte) = 0.3 GB/sec = 300 MB/sec (depending on whether vendors spec a MB or MiB).
The Samsung 840 Evo and Pro can both easily exceed this performance for sequential IO, and yes you can absolutely see this in the real world.