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AI Compute Tray Interconnect and Connector Solutions

As AI compute trays push toward higher data rates and adopt PCI Express (PCIe) 6.0, engineers must maintain signal integrity across longer electrical channels, manage thermal loads from high-power processors, and integrate dense power and data connectivity within a constrained mechanical envelope. Utilizing low-loss, space-efficient connectors across internal links, power distribution and front-panel I/O helps create a cohesive end-to-end interconnect architecture for high-performance compute trays. Molex offers a broad portfolio of high-speed power and management connectivity solutions that support high data rates, efficient power delivery and design flexibility for future system scaling.

Optimizing AI Compute Tray Connectivity for Next-Gen Performance

Modern AI compute trays rely on high-speed PCIe links to connect a growing number of processors and accelerators. As PCIe generations advance to higher data rates, with PAM-4 signaling in newer generations increasing sensitivity to channel loss and crosstalk, maintaining signal integrity across longer electrical channels becomes more difficult. Routing these within the tray is constrained by dense compute and cooling hardware, limiting available space around high-power processors and I/O interfaces. Higher compute performance also drives greater connector density within limited front-panel and backplane space, complicating connector placement and routing.

Passive and active cable assemblies support longer electrical channels through low-loss cabling, with active designs adding integrated signal conditioning when additional reach is required. High-speed pluggable I/O solutions enable dense front-panel interfaces across varying bandwidth and reach requirements while maintaining serviceability. Low-resistance power connectors support efficient power distribution, with hybrid power-and-signal connectors carrying power and sideband signals through an integrated interface.

Molex addresses next-generation PCIe connectivity challenges through high-performance interconnects that maintain signal integrity while leveraging low-profile, angled-exit architectures to maximize routing flexibility within dense tray layouts. With a broad portfolio of internal cabled connectivity, high-speed I/O, backplane and power solutions, Molex enables engineers to balance electrical, mechanical and thermal requirements across the tray while supporting scalable system architectures.

Internal System Connectivity

As AI compute trays integrate more processors and accelerators, a growing number of high-speed PCIe links must span longer channel lengths, increasing insertion loss while making it more difficult to route around dense cooling and processing hardware. This creates a need for low-loss interconnects that keep high-bandwidth electrical paths manageable within the constrained tray layout. Low-loss cable assemblies can bypass portions of long PCB traces, reducing attenuation while proving more routing flexibility around mechanical and thermal constraints. The Molex NearStack PCIe Connector System provides a compact, low-profile cabled interface with angled exits to support high-speed internal links and simplify routing around cooling hardware and other components.

Compute, Accelerator and Network Connectivity

  Configuration Data Rate Circuits Stack Height Differential Pair Density
Gemini Mezz Connectors Board-to-board connectors 224Gbps+ PAM-4 Up to 185 differential pairs 5.00mm Up to 63 differential pairs per square inch
  Configuration Data Rate Current Differential Pairs Wire Gauge
CX2 Connectors and Cable Assemblies High-speed internal I/O Up to 112Gbps Up to 0.5A per mated contact 32 31 AWG
CX2-DS High-Speed Connectors and Cable Assemblies High-speed internal I/O Up to 224Gbps Up to 0.5A per mated contact 32 to 64 30 AWG
  Configuration PCIe Generation Data Rate Circuits/Lanes Wire Gauge
Mini Cool Edge (MCIO) Connectors and Cable Assemblies Card-edge connectors PCIe 6.0 16, 32 and up to 64Gbps 4, 8, 16 or 20 lanes 32, 30 and 29 AWG
Multi-Trak I/O Connectors High-speed internal I/O PCIe 5.0 56Gbps PAM-4 x8 + power or x16 + power  
NearStack PCIe Connector System High-speed internal I/O PCIe 5.0 32Gbps NRZ x8; 72 circuits (18 differential pairs and 16 single-ended signals) 30 AWG twinax; 34 AWG sideband
NextStream Connector System High-speed internal I/O PCIe 6.0 Up to 64Gbps PAM-4 38 to 154 circuits; x4/x6, x8/x12, x16/x20 and x20/x24 32 to 28 AWG

Cooling, Monitoring and Control Connectivity

  Configuration Pitch Current Voltage Circuits
CLIK-Mate Connectors Wire-to-board connectors 1.25, 1.50 and 2.00mm Up to 4.0A Up to 250V 2 to 34
Micro-Fit+ Connectors Wire-to-board connectors 3.00mm

Up to 13.5A

 Up to 600V 2 to 24
Micro-Lock Plus Connectors Wire-to-board connectors 1.25, 1.50 and 2.00mm Up to 4.7A Up to 250V 2 to 42
Milli-Grid Connectors Wire-to-board connectors 2.00mm Up to 4.5A Up to 125V 2 to 50
Nano-Fit Connectors Wire-to-board connectors 2.50mm Up to 8.0A Up to 250V 2 to 16
Pico-Clasp Connectors Wire-to-board connectors 1.00mm Up to 2.0A Up to 100V 2 to 50

Cold Plate Liquid Cooling for Data Centers

Integrating high-power processors and dense I/O into space-constrained AI compute trays creates significant thermal loads that can push traditional air cooling toward its practical limits, increasing the need for liquid cooling. Molex offers a modular liquid cooling solution that combines cold plates, manifolds and real-time sensing technologies to support scalable deployment and maintenance in AI compute trays.

Explore Liquid Cooling Solutions

Leak Detection Cables

Liquid-cooled AI compute trays introduce the risk of fluid leaks near high-value electronics, which can lead to equipment damage and costly downtime. Molex Leak Detection Cables provide a flexible, compact solution for space-constrained trays, supporting early, false-alarm-resistant leak detection in scalable liquid-cooling architectures.

Explore Leak Detection Cables

Power Distribution and Module Management Connectivity

Efficient power distribution within AI compute trays demands compact, low-resistance connectors that limit voltage drop and heat generation while fitting within dense PCB layouts and crowded cooling assemblies. High-current connectors provide an efficient current path to the power distribution board, while hybrid power-and-signal connectors distribute power and sideband signals to individual modules, supporting functions such as presence detection, hot-swap sequencing, telemetry and health monitoring. UltraWize Wire-to-Board High-Current Connectors and Cable Assemblies offer a space-efficient solution for main power delivery, using a low-profile, side-exit design that minimizes stack height and cable-bend space. Micro-Fit+ PCIe Connectors combine power and sideband signal contacts to support module power and management functions in a compact interface.

  Configuration Current Voltage Circuits Operating Temperatures
EXTreme EnergetiC High-Current Connectors High-power solutions Up to 100.0A Up to 320V 2 to 31 -40 to +105°C
EXTreme Guardian System High-power solutions Up to 80.0A Up to 600V 2 to 70 -40 to +125°C
EXTreme PowerMass Connectors High-power solutions Up to 100.0A Up to 600V 1 to 64 -40 to +105°C
UltraWize High-Current Connectors and Cable Assemblies Board-to-board connectors Up to 170.0A Up to 125V 2 -40 to +125°C
  Configuration Current Voltage Pitch Operating Temperatures
Mega-Fit Connectors Wire-to-board connectors Up to 30.0A Up to 600V 5.70mm -40 to +105°C (tin); -40 to +120°C (gold)
Micro-Fit+ PCIe Connectors Wire-to-board connectors 9.2A per power contact; 1.0A per signal contact Up to 600V AC/DC 2.00 and 3.00mm -40 to +105°C

Rear Power and Backplane Connectivity

Integrating high-current power and high-speed data connections within the constrained space of a compute tray’s backplane creates connector placement challenges, complicating mating alignment and serviceability while making signal integrity more difficult to preserve. High-current power connections deliver the primary feed, while high-speed backplane links maintain signal fidelity across dense system layouts. For rear interfaces, PowerPlane OCP ORv3 IT Gear Cable Assemblies establish a customizable power interface from the rack busbar into the compute tray, supporting custom lengths and sensor pins for temperature tracking. The Inception Backplane Connector and Cable System offers multiple mating orientations and configuration options to drive high-integrity data transmission across dense layouts.

  Configuration Current Interface/Termination Wire Gauge Operating Temperatures
PowerPlane Busbar Connectors High-power solutions Up to 320.0A Solder tail and screw mount   -40 to +125°C
PowerPlane OCP ORV3 IT Gear Cable Assemblies High-power solutions Up to 100.0A per circuit Busbar-to-cable 22 and 6 AWG +15 to +70°C
  Configuration Data Rate Interconnect Types Impedance Twinax Wire Gauge
Impel/Impel Plus Backplane Connectors Backplane connectors 25 to 40Gbps (Impel); up to 56Gbps (Impel Plus) Daughtercard, coplanar, vertical header and cable 90 Ohms 30 and 28 AWG
Inception Backplane Connector and Cable System Backplane connectors Up to 224Gbps Traditional, coplanar, orthogonal direct, mezzanine and cable 92 Ohms  
  Configuration Fiber Mode Fibers per Connector Insertion Loss Operating Temperatures
VersaBeam Expanded Beam Connectors and Cables Optical solutions Single-mode (SM) and multi-mode (MM) 12, 16, 144 or 192 <0.7 dB (SM); <0.3 dB (MM) -10 to +60°C
Versatile Format Interconnect (VFI) Optical Backplane System Optical solutions SM and MM 8, 12, 24 or 36 fibers per ferrule Ferrule type dependent -20 to +70°C

Front-Panel I/O and Network Connectivity

AI compute trays require high-bandwidth network connectivity while accommodating dense pluggable I/O and service interfaces within limited front-panel space and complex cable routing constraints. High-performance, scalable connectivity solutions support high-speed I/O architectures over extended distances, ensuring front-panel serviceability and future adaptability as data rates evolve. Molex offers a broad portfolio of high-speed pluggable I/O solutions, enabling designers to optimize interface and cable selection. Molex Modular Jacks and USB Connectors provide readily accessible ports for system management and service functions.

  Configuration Data Rate per Lane Aggregate Data Rate Cable Type/Wire Gauge Form Factor/Lanes
Active Electrical Cable (AEC) Solutions High-speed pluggable I/O Up to 224Gbps PAM-4 Up to 1.6Tbps Discrete twinax; 34 to 26 AWG QSFP (4 lanes); OSFP and QSFP-DD (8 lanes)
Active Optical Cables (AOC) High-speed pluggable I/O 1.0 to 14.0Gbps Up to 56.0Gbps Optical fiber QSFP+, iPass+ HD and CXP; 4 bidirectional optical links per end
CDFP Connector System High-speed pluggable I/O Up to 64Gbps PAM-4 Up to 256Gbps per 16-lane connector Discrete twinax; 30 AWG (PCIe 5.0), 29 AWG (PCIe 6.0) CDFP; x4, x8 and x16 configurations
Direct Attach Cable (DAC) Assemblies High-speed pluggable I/O Varies by assembly Up to 800Gbps Passive copper; varies by assembly QSFP, QSFP-DD, SFP and related variants
OSFP Connector System High-speed pluggable I/O 56, 112 and 224Gbps PAM-4 Up to 1.6Tbps per module Direct attach cable, active electrical cable, active copper cable and active optical cable OSFP; 8 or 16 lanes
QSFP-DD Connector System High-speed pluggable I/O 28Gbps NRZ; 56 and 112Gbps PAM-4 Up to 800Gbps Copper and optical cable options QSFP-DD; 8 lanes
  Configuration Current Mating Cycles Data Rate Voltage
Modular Jacks Modular connectors Up to 1.5A Up to 2,500 10, 100 and 1,000Mbps Up to 150V AC (RMS)
USB Type-A Connectors I/O connectors Up to 1.8A Up to 5,000 Up to 5Gbps  
  Configuration Fiber Type Fiber Count Insertion Loss Cable Specifications
ELSFP Interconnect System Optical solutions Polarization maintaining (PM) or SM Up to 12 fibers per MT ferrule; 1 or 2 MT ferrules   Bare fiber or round cable
MMC Cable Assemblies and Adapters Optical solutions SM 16 or 24 fibers 0.35 dB 2.00 to 2.50mm outside diameter
MPO Cable Assemblies and Adapters Optical solutions MM or low-loss SM 8, 12, 16, 24, 32 or 48 fibers; 72, 144 or 288 fibers in trunk cables 0.75 dB (SM); 0.35 dB (MM) 3.00mm outside diameter