Will I get full speed of USB3 using PCi 2 slot? Tags: Motherboards Pci Bottleneck Usb3 Last response: October 26, 2011 5:44 PM in Motherboards Share midi25 October 26, 2011 3:56:02 PM Hi I have purchased a USB 3 Pci2 card. What I want to know is will I get the full speed of USB 3 with PCi2? Will I have any bottlenecks and what is the max throughput of PCi2? Thanks More about : full speed usb3 pci slot | E-mail me updates | Report abuse Register or log in to remove itzdanielp Motherboard Master October 26, 2011 4:38:23 PM You will be media limited far before you saturate the pipeline of a PCIe 2.0 bus. | Report abuse MRFS October 26, 2011 5:44:53 PM A single x1 PCI-E 2.0 lane oscillates at 5 GHz, and each byte has one extra start bit and one extra stop bit, in addition to 8 data bits, OR 10 bits per byte. Thus, 5 GHz / 10 = 500 Megabytes per second in each direction (max bandwidth) per PCIe 2.0 lane. USB 3.0 is 10 TIMES the speed of USB 2.0, or 10 x 480 Megabits per second = 4.8 Gb/sec. http://www.everythingusb.com/superspeed-usb.html Again, each transmitted byte has a start and stop bit + 8 data bits. Thus, 4.8 Gbps / 10 = 480 Megabytes per second. So, the limiting factor is the USB 3.0 bandwidth (480) not the PCI-E 2.0 bandwidth (500). Of course, controller efficiency is a factor too, but no controller can exceed the rated max bandwidth. Hope this helps. MRFS | Report abuse Ask the community Publish Tom's Hardware>Forum>Motherboards>Will I get full speed of USB3 using PCi 2 slot?> Related ressources: ForumWill Koutech USB3 PCIe work in ASUS Sabertooth x58 black PCIe slot ? ForumSabrent USB3 2 port card - slow data xfer ForumPcie x1 card in pci slot ForumIs there a usb3 card for pci -x slot ForumUSB3 vs UD3 ForumWill a pci slot bottleneck a usb 3.0 card?? ForumSpeed of 2 .5" HD: External USB3 vs. Internal SATA ForumM4A89GTD-Pro USB3 which video slot ?? ForumUsing a 6850 in a pci -e 1.0 slot & older system ForumI only have pci slots - can I get USB 3.0 on my PC ForumExternal USB3 3TB drive shows 2 devices? ForumCPU Fan speed stuck on high after moving vid card to a new pci -e slot ForumStrange Boot situation on Z77 Forum[Solved] Is DDR3 really twice the speed of DDR2? Forum[Solved] Will the CPU fit? ForumWill an HD6850 block the SATA connectors of the P55G ? ForumWill a emachine with windows 7 take more then 2 gigs of memory Forum[Solved] Will ram fail not on QVL? ForumWill this CPU cooler fit on my mother board? Forum[Solved] Will athlon II 630 CPU x4 work with ddr3 1866 More resources Read discussions in other Motherboards categories BIOS Boot Chipsets ASRock Asus Chaintech DFI Elitegroup FIC Foxconn Gigabyte Intel MSI-Microstar !