Does the nvme m.2 ssd to pcie x16/x8/x4 card support 4.0 speeds, or 3.0 only?

Everyone is falling over themselves to give you the wrong answer. Two of these comments are referring to the hero vii and not the hero viii which the dark hero OP has is based on. His board has 3 x16 slots, the top 2 to the CPU can either be configured for a single slot at 16 lanes, or x8 on both. The CPU only has 24 lanes total, and 4 go to the chipset 4 to the m.2 slot1. Chipset works like a switch providing 16 more lanes are higher latency The 3rd slot is x4 wired pcie 4.0 to the chipset. So yes, he should be capable of 4.0 speeds if this adapter supported it. That he can't suggests he either used too many of the 16 lanes his chipset provides or this card can't provide 4.0 passthrough.

In re: to the sabrent nvme m.2 ssd to pcie x16/x8/x4 card with aluminum heat sink. why does paperwork that comes with the card says for x16 slot only?

The physical form factor is for a 16x "slot" with the retaining tab/clip. This should provide adequate physical support since it does not use a bracket for the card slot. Depending on the mainboard/motherboard, Installing it in an 8x or 4x slot connector may not align properly or provide sufficient support. Not all physical 16x slots are actually wired to support sixteen (16) PCIe lanes. The same is true of smaller slots. To get the full performance, the slot must support or be "wired" for at least four (4) logical lanes. For instance I have it installed in a physical 16x slot that is only "wired" for four (4) lanes, which in this case happens to be the perfectly matched scenario.

Does this device require pcie lane bifurcation on the motherboard, or is it handled on the card itself?

That is handled by the card itself. It has an ASMedia PCIe switch built in for broad compatibility.

With all slots populated, do the drives run at pcie 3.0 x1 speeds?

Each drive can be independently accessed with up to PCIe 3.0 x2 lanes per M.2 slot.

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🚀 Elevate Your Storage Game!

UNLEASH SPEED - Experience lightning-fast data transfer with NVMe technology.
ROBUST COOLING - Equipped with an aluminum heat sink to keep your SSD cool under pressure.
EFFORTLESS INSTALLATION - Comes with screws and screwdriver for a hassle-free setup.
FUTURE PROOF YOUR SETUP - Designed for PCIe x16/x8/x4 slots, ensuring compatibility with modern systems.
VERSATILE COMPATIBILITY - Supports multiple M.2 sizes (2230/2242/2260/2280) for your needs.

The SABRENT NVMe M.2 SSD to PCIe X16/X8/X4 Card (EC-PCIE) is a high-performance solution designed to enhance your system's storage capabilities. With support for various M.2 sizes and a robust aluminum heat sink, this card ensures optimal performance and cooling. Installation is a breeze with included screws and screwdriver, making it the perfect choice for tech-savvy professionals looking to upgrade their setup.

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Brand	SABRENT
Product Dimensions	10.16 x 5.08 x 1.27 cm; 80 g
Item model number	EC-PCIE
Manufacturer	SABRENT
Color	M.2 PCIe Card + Heatsink
Hard Disk Description	Solid State Hard Drive
Graphics Card Interface	PCI-Express x16
Hardware Platform	Sata
Operating System	Linux, Windows 8
Are Batteries Included	No
Item Weight	80 g

Sabrent NVMe M.2 SSD to PCIe X16/X8/X4 Card with aluminum heat sink (EC-PCIE)

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