on which website i can find Motherboards which has pcie X16 for

It's got a PCIe x16 slot and a PCIe x1 slot There are three PCIe slots, all of which are cooled by simple heatsinks, and

Systems with PCI Express ® Slot Spec Revision PCIe at 32GTs PEX89000, PCIe at 32GTs, x16, PCIe 32 GTsec Switch, 144-lanes, 104

pcieslot Slot power ; x1 cards are limited to A at +12 V and 10 W combined ; x4 and wider cards are limited to A at +12 V and 25 W combined ; A full-

pcie slot function : PCIe x16 full speed, 256Gbps Application: PCIe x16 graphics card to PCIe x16 slot extension cable Package Includes: 1 x PCIE 16X