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Green rectangular PCIe 4.0 x16 riser card with four M.2 M-key slots

ASRock Rack

ASRock Rack RB4M2_G4 PCIe 4.0 x16 to 4 M.2 M-key server accessory

SKU CH-SV7X-C0RKT MPN RB4M2_G4

Adds four M.2 M-key slots via a single PCIe 4.0 x16 connection, supporting 22110, 2280, 2260 and 2242 form factors

  • Product typeInterface Module
  • Product colorGreen
  • DetailsPhysical Status Dimensions: 2.9 in x 5.7 in (73.65 mm x 144.
  • Adds four PCIe 4.0 x4 M.2 slots from one x16 link
  • Fits 22110, 2280, 2260 and 2242 drive lengths
  • Green NPG-170D+H1 PCB measures 73.65 mm by 144.78 mm
  • Physical status interface module for server expansion
  • First listed by manufacturer in August 2021

PCIe 4.0 x16 to quad M.2 adapter

The ASRock Rack RB4M2_G4 is an interface module that adds four M.2 M-key slots to a single PCIe 4.0 x16 slot. It is designed for server builders who need high-density local storage on a platform with limited drive bays.

Four M.2 slots at x4 each

Each slot runs at PCIe 4.0 x4 and accepts 22110, 2280, 2260 and 2242 form factors. The green PCB uses NPG-170D+H1 material and measures 73.65 mm by 144.78 mm. No cables or brackets are included in the package.

Verify slot wiring and clearance

Confirm the host platform can bifurcate a PCIe 4.0 x16 link into four x4 lanes; without bifurcation only the first drive will be detected. Check that the 2.90 inch by 5.70 inch card fits the chassis slot spacing and that airflow reaches the installed modules. Buyers who need RAID hardware or pre-installed drives must look elsewhere.

How it compares

Measured against everything we stock in Drive Cages & Server Add-Ons, at today’s prices. Recalculated every night.

Price $69.99
Typical for this category: the median of 1,119 items is $74.99.

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Specifications

Product
Brand nameASRock Rack
Model nameRB4M2 G4
Product typeInterface Module
Product colorGreen
Size & build
Shipping weight0.09 kg
Package size254 × 155 × 27 mm

Questions about this item

Will the NPG-170D+H1 PCB material need replacement after long-term use?

The NPG-170D+H1 PCB is a passive structural material with no moving parts or consumable elements, so it does not require scheduled replacement under normal server operating conditions.

Which limit appears first when all four M.2 slots run PCIe 4.0 x4 continuously?

The upstream PCIe 4.0 x16 link provides exactly the combined bandwidth of four x4 drives, so the host slot becomes the first bottleneck before any individual M.2 device saturates its own lane allocation.

How much extra heat or power does the card add when four 22110 drives operate all day?

The board itself draws only negligible leakage power and has no active cooling; total heat and power are dictated entirely by the installed M.2 drives, which the card passes through without regulation.

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