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I have a Kingston V200 256GB SSD. When connected to my SATA 6.0gbps port on my motherboard I'm seeing sequential read speeds of 300 megabytes / second.
When I put the drive into a sata to USB 3.0 enclosure and connect it to my USB 3.0 motherboard port my sequential read speed is maximum of 200 megabytes / second and average of 120 megabytes / second. I tried the enclosure on another machine and got 120 megabytes / second as well.
I'm guessing the enclosure itself is the bottleneck. Anyone know of reviews/benchmarks on enclosure chipsets themselves so I can buy something that isn't going to slow me down?
200MB/s is 1.6Gbps. Are you realistically being slowed down by this, or do you just want to be as fast as SATA? USB 3 has a theoretical maximum of 5Gbps but realistically, what you're seeing isn't that bad. – None – 2012-07-14T19:28:30.510
Yet other benchmarks I've seen show USB 3.0 external SSD drives getting 300MB+. So if my SSD can get 300MB/s (2.4gbps) when connected to SATA it should be the same speed on USB 3.0. So the SSD is capable of 2.4gbps which is well within the range of expected real-world USB 3.0 bandwidth. I think my issue is a crappy USB 3 enclosure. – rbeede – 2012-07-14T23:34:49.330
Maybe, and maybe it’s your cables, your motherboard’s USB 3.0 implementation, your USB port… Have you tried using a high-quality cable, connected to a USB port directly on the motherboard? – Synetech – 2012-07-22T02:18:36.727
Yes, I tried all of those things. I reviewed the motherboard benchmarks and others have gotten better performance. – rbeede – 2012-07-23T14:17:31.253