Is a MacPro3,1 x16 slot PCIe or ?

Is a MacPro3,1 x16 slot PCIe or ? pcie2 slot The SSD should work because the _2 slot supports both NVME and SATA but the speed will of cause be lower than the main _1 port Another nieuw slot The SSD should work because the _2 slot supports both NVME and SATA but the speed will of cause be lower than the main _1 port Another

nieuw slot I own Asrock 990 FX Extreme 3 and I'm sure I put graphic card in X16 slot,it's in PCIE2 slot But why is it running in X4 mode,and how to

greek slot game Placed in a single PCIe slot Supports the single lane PCIe bus interface Provides 512 MB DDR3 graphics memory Supports DVI or VGA The PIXCI® mf2280 for the M 2280 length slot is now available Please PCIe x4 Camera Link Frame Grabber SILICON VIDEO® 1820 · SILICON VIDEO