PCIe 4.0 Riser Card Converter/X16 Slot PCI-E Gen 4 Extension Adapter Card for PC Graphics Cards(P16AC X16 90degree)

There are 3models (P816B / P416B / P16AC ) for your choice. pls choose the one you need.
P816B PCIe 4.0 X8 to X16 Adapter
Feature:
1. PCle 4.0 X8 to X16 adapter card, 8X bandwidth.
2. It supports PCIe 4.0 devices, and backward compatible with PCIe 3.0 ( The use of PCE extension cable may cause speed reduction, pls take it into your account before buying. )
3. Gold finger process, 5U thick, using high-density low-impedance circuit board
4. X8 pin definition (pin definition) one-to-one.
5. Adopt Amphenol's new generation GEN4 connector, with buckle, stable at high speed.
6. It is suitable for converting X16 card into PCIe X8 slot on the motherboard (bandwidth is X8).
7. It supports for graphics cards, network cards, solid state hard disks, and acquisition cards, etc. with standard PCIe.
8. The total height of the adapter card is 3cm.
P416B PCIe 4.0 X4 to X16 Adapter
Feature:
1. PCle 4.0 X4 to X16 adapter card, 4X bandwidth.
2. It supports PCIe 4.0 devices, and backward compatible with PCIe 3.0 ( The use of PCE extension cable may cause speed reduction, pls take it into your account before buying. )
3. Gold finger process, 5U thick, using high-density low-impedance circuit board
4. X4 pin definition (pin definition) one-to-one.
5. Adopt Amphenol's new generation GEN4 connector, with buckle, stable at high speed.
6. It is suitable for converting X16 card into PCIe X4 slot on the motherboard (bandwidth is X4).
7. It supports for graphics cards, network cards, solid state hard disks, and acquisition cards, etc. with standard PCIe.
8. The total height of the adapter card is 3cm.
P16AC PCIe 4.0 X16 90 Right Angled Adapter
Feature:
1. PCle 4.0 X16 90degree Right angled adapter
2. It supports PCIe 4.0 devices, and backward compatible with PCIe 3.0 ( The use of PCE extension cable may cause speed reduction, pls take it into your account before buying. )
3. Gold finger process, 5U thick, using high-density low-impedance circuit board
4. Impedance control 85, power supply line is thickened and capacitance is increased
5. AdoptAmphenol's new generation GEN4 connector, with buckle, stable at high speed.
6. It is suitable for computer case modification graphics card position.
7. It supports for graphics cards, network cards, solid state hard disks, and acquisition cards, etc. with standard PCIe.
8. The total height of PCB is 4cm