Date: Sat, 24 Nov 2012 18:40:58 +0100 From: "Lucas B. Cohen" <lbc@bnrlabs.com> To: "Ronald F. Guilmette" <rfg@tristatelogic.com> Cc: freebsd-questions@freebsd.org Subject: Re: Compatability for various USB 3.0 / PCIe cards ? Message-ID: <50B106AA.7060105@bnrlabs.com> In-Reply-To: <21690.1353705073@tristatelogic.com> References: <21690.1353705073@tristatelogic.com>
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On 2012.11.23 22:11, Ronald F. Guilmette wrote: > > Well friends, it's that time of year again... yep, it's shop till you drop > time! For me it's usually *after* Christmas season, but whatever works :) > I can't imagine > that there is really that much different about the pricey ones to make > them worth the extra money.) I can imagine it. For a controller, negotiating USB 3.0 / XHCI protocol with a device is one thing, delivering the expected bandwidth is another. I've toyed around with enough cheap IDE and SATA adapters to know it takes more than a logo on the packaging to get decent throughput. Also, the bus needs to offer enough bandwidth to avoid being a bottleneck. Theoretical maximum speed for USB3 is 5 Gbits/s, that's a bit more than 2 PCIe lanes can sustain, so you'll want an adapter than plugs into a full-sized PCIe connector, unlike the Syba one. Hope this helps,
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