Read more.Quote:
Provides 2x USB 3.0 Type-A ports (+ 2x int), plus a single 10Gbps USB 3.1 Type-C port.
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Read more.Quote:
Provides 2x USB 3.0 Type-A ports (+ 2x int), plus a single 10Gbps USB 3.1 Type-C port.
There is no way on God's green earth that the picture of the low profile bracket is the one that comes in the box: it'd make both full-size ports completely unusable!
Also, PCIe 2.0 x2? Slightly unusual choice, although I suppose a lot boards have an electrical x4 slot nowadays so perhaps that's the thought behind it...
seems an easy way to get USB3 on my old X58 board ;)
PCI-E 2.0 x2, 500MB/s per lane, 1GB/s per lane == 8Gb/s which is significantly less than the 10Gb/s advertised. How do they get away with this misleading advertising?
For those not wanting to deal with the extra SATA power cable; I picked up one of these:
http://www.gigabyte.com/products/pro...px?pid=5430#ov
PCI-E x4 connector, and 3.1 on both the type A and C connectors. No internal headers, which might be a deal breaker for some... but for those with case windows, this card works nicely :p
Su
That Gigabyte card appears to use the same ASMedia PCIe USB 3.1 chipset as the Silverstone card here, which according to the datasheet runs at either x2 @ 2.0 or x1 @ 3.0, i.e. both have a PCIe link speed of ~8Gb/s, despite both having a physical x4 connector.
The main difference is that this Silverstone card also has a VLI 4-port USB 3.0 hub chip to provide four USB 3.0 ports, off one of the two 3.1 USB ports off the ASMedia chip.
EDIT: It seems like all the USB 3.1 PCIe cards currently available from any brand has the same ASMedia ASM1142 chip,
So really, all current USB 3.1 PCIe cards are bottlenecked at ~8Gb/s and Silverstone has been the most 'honest', as it seems they were the only manufacturer to admit the thing runs at PCIe 2.0 x2.
About time this thing appeared, now I can extend the longevity of my old Z77 motherboard
There's a difference between upstream bandwidth and downstream bandwidth.
You are correct: the PCIe 2.0 clock oscillates at 5 GHz and
it uses an 8b/10b "legacy frame" which requires 10 bits per byte:
1 start bit + 8 data bits + 1 stop bit
Hence, 5G / 10 bits per byte = 500 Megabytes per second per PCIe 2.0 lane.
Upstream bandwidth across an x2 PCIe 2.0 edge connector = 2 @ 500 MB/s = 1,000 MB/second
Downstream bandwidth over the USB 3.1 port oscillates at 10 GHz and
it uses a 128b/132b "jumbo frame" (132 bits for 16 bytes per frame = 8.25 bits per byte)
Downstream bandwidth of a USB 3.1 cable = 10G / 8.25 bits per byte = 1,212 MB/second
Your error is here: "1GB/s per lane == 8Gb/s" should be "== 10Gb/s"
x2 PCIe 2.0 lanes @ 5 GHz = 10 GHz (i.e. 10 Gigabits per second).
Never have I seen a USB expansion card generate such fervent discussion...
:p :D
Quote - "SilverStone hasn't indicated availability or pricing."
So pretty much vapourware to my eyes till those important facts are known.