Solved What does it mean that a "PCI-Express 3.0 X16 Slot runs at X8"? Tags: ASrock Computer PCI Express Motherboards Last response: December 16, 2012 4:42 AM in Motherboards Share RS13 December 15, 2012 12:58:13 AM Thinking about buying the ASrock Extreme4 for my computer. However, under slots on the amazon page it says "2X PCI-Express 3.0 X16 Slots (runs at X8)" What does this mean? I don't want to buy with knowing what I'm buying. Thanks. PS here's the page for full context. http://www.amazon.com/LGA1155-CrossFireX-Motherboard-Z7... More about : pci express x16 slot runs abbadon_34 a b V Motherboard December 15, 2012 1:12:27 AM It mean the slot are full length (i.e. video cards) but run at half that, because it's sharing bandwidth ("lanes") with other slots/devices. Pretty common. RS13 December 15, 2012 1:15:09 AM How do they run at half length? Related resources What does the PS4's 8 core CPU mean for PC gaming? - Forum CPU usage graph in Task Manager (XP) - What does % mean ? - Forum What does PCI Express 2.0 16x slot (@x4) mean ? - Forum What does BULK mean in psu marketing? - Forum What does i mean in corei3.i5 and i7 processors - Forum Can't find your answer ? Ask ! Get the answer djangoringo a c 79 V Motherboard December 15, 2012 1:15:10 AM It probably meant 8x/8x dual mode, the pcie 3.0 slot single is at 16x, single at x16 (PCIE2) / x8 (PCIE3) abbadon_34 a b V Motherboard December 15, 2012 1:18:12 AM Sorry, meant it's running at the speed as if it was half that length. RS13 December 15, 2012 1:25:55 AM So how much of an effect will that have on the video card's performance? Best solution dannoddd December 15, 2012 1:34:32 AM Next to none. Until you get down into PCIe 1 or PCIev2 x4 you aren't going to see any drops. Here's a link that shows the effects, http://www.techpowerup.com/reviews/Intel/Ivy_Bridge_PCI... abbadon_34 a b V Motherboard December 15, 2012 8:07:17 AM +1 hytecgowthaman a b V Motherboard December 15, 2012 8:34:23 AM Gpu set up look like this. 1x gpu=x16; 2x gpu=x16+x16=(x32); 3x gpu=x16+x8+x8=(x32); 4x gpu=x16+x8+x4+x4=(x32). so 2xgpu=4xgpu. So insert the gpu in x16 slots. RS13 December 16, 2012 4:42:36 AM Best answer selected by RS13. Can't find your answer ? Ask ! Publish Related resources: ForumWhat does lock code password mean ? how do i unlock phone? ForumWhat does DDR3 1600+ Mean ? ForumWhat does multimedia instruction mean in regards to a CPU? ForumWhat does unsupported personality: PCL mean ForumWhat does "max" mean on HWMonitor? ForumWhat does a reference model mean ForumWhat does supported only by cpu with integrated graphic mean ForumWhat does this mean ? Help please =) ForumPcie x16- what does this mean ? ForumWhat does no bootable device insert boot disk mean on acer ForumWhat does it mean when a computer sparks and pops when plugged in ForumWhat does lan not connected mean Forum"Embedded Options Available" what does it mean in a processor???? ForumEm schematic says 52-6 wire. What does the -6 mean ? ForumWhen we finally can’t attained athletic subject, More resources Read discussions in other Motherboards categories BIOS Boot Chipsets ASRock Asus Chaintech DFI Elitegroup FIC Foxconn Gigabyte Intel MSI-Microstar !