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Green circuit board with silver metal bracket and two RJ45 ports

DELL

DELL N20KJ 57810S Dual Port 10Gb BASE-T Network Card

SKU CH-9SAS-KYC66 MPN N20KJ

Dual-port 10Gb BASE-T server adapter with PCI Express x8 interface for RJ-45 twisted pair networks

  • Speed10GBase-T
  • Connectors10GBase-T
  • InterfacePCI-Express
  • Dual 10 Gb ports double server bandwidth
  • PCI Express x8 interface delivers full 10GBase-T throughput
  • Two RJ-45 connectors use existing twisted-pair cabling
  • Broadcom 57810S controller handles heavy network loads
  • Plug-in card form factor fits standard server slots

Dual-port 10Gb BASE-T adapter

The DELL N20KJ 57810S is a dual-port 10Gb BASE-T server adapter built on a Broadcom controller. It installs in a PCI Express x8 slot and provides two RJ-45 ports for twisted-pair cabling. The card targets servers that need 10-gigabit connectivity over existing copper infrastructure.

Upgrade from single-port or 1Gb links

This adapter replaces single-port 10Gb cards or dual-port 1Gb NICs when a server requires two independent 10Gb links. The jump is worth it when bandwidth per port must exceed 1Gb and the cabling plant already uses twisted pair. It does not suit buyers who need fibre connectors or more than two ports.

Sustained throughput on copper

Under sustained load the Broadcom 57810S maintains line-rate 10Gb traffic across both ports simultaneously. Heat dissipation is handled by the server chassis airflow across the plug-in card form factor. The adapter does not throttle during long transfers because it lacks onboard components that would limit continuous operation.

Highlights

  • Dual 10 Gb ports double server bandwidth
  • PCI Express x8 interface delivers full 10GBase-T throughput
  • Two RJ-45 connectors use existing twisted-pair cabling
  • Broadcom 57810S controller handles heavy network loads
  • Plug-in card form factor fits standard server slots

Specifications

BrandDell
Speed10GBase-T
Connectors10GBase-T
InterfacePCI-Express
Shipping weight0.91 kg
Package size127 × 76 × 51 mm

Questions about this item

What PCI Express slot width does the N20KJ card require?

The adapter uses a PCI Express x8 host interface, so it needs an x8 or wider slot on the server motherboard.

How do you seat the N20KJ adapter and what step is often missed?

Insert the plug-in card firmly into the PCI Express x8 slot until the bracket clicks, then secure the retaining screw; the step often missed is attaching the bracket screw after seating.

Which cables and ports will need checking or replacement over time on the 57810S?

The two RJ-45 ports use twisted-pair cabling for 10GBase-T; inspect Cat6a or better patch leads and the port contacts periodically for wear or dust.

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