On Tue, 25 Apr 2017 04:11:28 +0000 (UTC), Ivan K wrote: Hi, x16 is no information about the version. "PCIe 2.0 cards are also generally backward compatible with PCIe 1.x motherboards, using the available bandwidth of PCI Express 1.1." - https://en.wikipedia.org/wiki/PCI_Express "A PCI Express card fits into a slot of its physical size or larger (with ×16 as the largest used), but may not fit into a smaller PCI Express slot; for example, a ×16 card may not fit into a ×4 or ×8 slot. Some slots use open-ended sockets to permit physically longer cards and negotiate the best available electrical and logical connection. The number of lanes actually connected to a slot may also be fewer than the number supported by the physical slot size. An example is a ×16 slot that runs at ×4, which will accept any ×1, ×2, ×4, ×8 or ×16 card, but provides only four lanes. Its specification may read as "×16 (×4 mode)", while "×size @ ×speed" notation ("×16 @ ×4") is also common. The advantage is that such slots can accommodate a larger range of PCI Express cards without requiring motherboard hardware to support the full transfer rate. Standard mechanical sizes are ×1, ×4, ×8, and ×16. Cards with a differing number of lanes need to use the next larger mechanical size (ie. a ×2 card uses the ×4 size, or a ×12 card uses the ×16 size)." - https://en.wikipedia.org/wiki/PCI_Express Regards, Ralf