11/10/2019 Expansion Card Usb 3.0 For Mac Pro
First, you have to make sure you have a free port available on your motherboard. Admittedly, I'm not particularly familiar with Mac's, so I would suggest looking in your computer manual. If you've lost the manual, you can find it online. Could you also provide a link to the exact PCIe Expansion card you are talking about? Inateck makes quite a few of those.
Just note that you will probably be significantly limited in your bandwidth if you plan on populating all four USB 3.0 ports. One USB 3.0 has a maximum bandwidth of 5 Gbit/s, so that means the card could use up to 20 Gbit/s in total.
This item [Support UASP for Mac Pro] Inateck 4 Ports PCI-E to USB 3.0 Expansion Card for Mac Pro (Early 2008 to 2012 Late Version) - Interface USB 3.0 4-Port Express Card Desktop for Windows XP/7/8/ Mac OS 10.8.2 to 10.9.5 - No Additional Power Connection Needed.
A PCIe x1 port will provide 4 Gbit/s, so if the card is x1 then you will be bottlenecked by using even 1 of the four USB 3.0 ports. A PCIe x4 has four times the throughput as an x1, so 16 Gbit/s, which could still be a limitation. A PCIe x8 provides a 32 Gbit/s transfer rate.
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The only problem with this is that you are wasting 12 Gbit/s (which could give you 2 extra USB 3.0 ports), and x8 cards aren't very common. Just note that if you plan on using a USB 2.0 device(s) in the card you should be fine with even a PCIe x1, as one USB 2.0 uses about 1/10 of the bandwidth of USB 3.0 (500 Mbit/s, or 2 Gbit/s if all four ports are being used). In fact, you could probably cram 8 USB 2.0 ports into one PCIe x1 card (or 16 USB 1.0). Dunno exactly what you'll be using this capture device for, but you should know that HDMI cables use anywhere from 5 Gbit/s to 18 Gbit/s, so you could be severely limiting yourself by going with USB. (Although I believe that if you are only doing 1080p @ 60 Hz you will.barely. be fine). Biography for full specs.
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