This Adapter Card Is Not Plug-And-Play! You Need Your Motherboard To Support Pcie Splitting And You Need To Be To Set Up And Debug The Bios Yourself! Many Motherboards Cannot Be Used Simply By Setting Up And Splitting Them. They Also Need To Be Set Up In Other Places! Our Store Does Not Have The Same Motherboard As Yours And Cannot Provide You With Any Technical Support! Some Motherboards Not Recognize The Second Hard Drive When Using This Adapter Card! The Motherboard Is X79 X99 X299 Or Z97 Z170 Z270. This Kind Of Old Chipset Motherboard Not Recognize The Hard Drive (This Is The Case With Pm983 In Our Shop) When It Is Turned On For The First Time (Probably Because The Motherboard Is Too Old. The Hard Disk Master Control Is Too New, And The Motherboard Bios Is Not Very Compatible With The Hard Disk). If You Plug It In And The System Does Not Recognize It For The First Time, Don'T Worry About It. After Restarting The System For The Second Time, The Disk Be Recognized. For The Same Hard Disk, The Same Adapter Card And The Same Computer, You Must Do The Same When Changing The Pcie Slot. After Correct Identification, You Can Install The System And Make A System Disk Or Data Disk. Description: 1. Please note that most motherboards must be matched with the CPU. Low-end CPUs do not support splitting because there are not enough PCIe lanes. 2. This product can only be used in PCIe slots that support PCIe splitting. The signal line of the hard disk on the adapter card is directly connected to the PCIe signal line of your computer motherboard, so there is no restriction or change on the performance of your hard disk. The speed of your hard drive, etc. The speed is determined by your computer and hard drive. 3. Regarding the PCIe 3.0 4.0 issue, the hard disk interface signal line of the adapter card is directly connected to the PCIe interface of your machine. There is no need for chip conversion in the middle, so the adapter card does not limit the performance of the hard disk. Your hard disk and your computer decide speed. The adapter card only plays a role in changing the shape of the interface. 4. Please be sure to note that if this adapter card needs to be inserted into a PCIe x16 slot, make sure there is no fixed buckle at of the slot. If there is, the adapter card cannot be inserted in place. Note: The appearance, color and printing of the product from batch to batch, but it not affect the use Material: PCB colour: As shown Package Contents: 2 x Adapter Card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.