DAC Cables

Add NJAAKK-N911 QSFP112 400G-Rated Passive DAC Cable, 0.5m – NVIDIA DGX Spark Approved Stacking Cable | Resilient Tec to the cart
Add MCP1650-V00AE30 QSFP/CX7 Cable — 200G QSFP56 Passive DAC, 0.5m – NVIDIA DGX Spark Compatible to the cart
Add LMTQF022-SD-R QSFP112 400G-Rated Passive DAC Cable, 0.5m – NVIDIA DGX Spark Approved (Luxshare) | Resilient Tec to the cart
Add SFP-H25G-CU1M, Cisco 25GBASE-CR1 SFP28 Passive Copper Cable - 1M to the cart
Add MCP7H60-W002 NVIDIA/Mellanox Compatible, 400G QSFP-DD to 2x200G QSFP56 Passive Breakout DAC Cable - 2m to the cart
Add Cisco SFP-H10GB-CU1M 10GBASE-CU SFP+ Direct-Attach Cable, New to the cart
Add MCP4Y10-N002 OSFP 400G NDR InfiniBand Passive DAC Cable, 2m – NVIDIA DGX H100/H200 to the cart
Add MCP4Y10-N001 OSFP 400G NDR InfiniBand Passive DAC Cable, 1m – NVIDIA DGX H100/H200 to the cart
Add SFP-25GE-DAC-1M Juniper Compatible, 25G SFP28 Passive DAC Cable - 1m to the cart
Add JNP-100G-4X25G-3M Juniper Compatible, 100G QSFP28 to 4xSFP28 Passive Breakout DAC Cable - 3m to the cart
Add JNP-100G-4X25G-1M Juniper Compatible, 100G QSFP28 to 4xSFP28 Passive Breakout DAC Cable - 1m to the cart
Add JNP-100G-DAC-3M Juniper Compatible, 100G QSFP28 Passive DAC Cable - 3m to the cart
Add QFX-QSFP28-DAC-1M Juniper Compatible, 100G QSFP28 Passive DAC Cable - 1m to the cart
Add CAB-QD-QD-400G-1M Arista Compatible, 400G QSFP-DD Passive DAC Cable - 1m to the cart
Add CAB-S-S-25G-1M Arista Compatible, 25G SFP28 Passive DAC Cable - 1m to the cart
Add CAB-Q-4S-100G-3M Arista Compatible, 100G QSFP28 to 4xSFP28 Passive Breakout DAC Cable - 3m to the cart
Add CAB-Q-Q-100G-3M Arista Compatible, 100G QSFP28 Passive DAC Cable - 3m to the cart
Add CAB-Q-Q-100G-1M Arista Compatible, 100G QSFP28 Passive DAC Cable - 1m to the cart
Add CBL-25GSFP28-DO-1M Dell Compatible, 25G SFP28 Passive DAC Cable - 1m to the cart
Add 470-ABQD Dell Compatible, 100G QSFP28 to 4xSFP28 Passive Breakout DAC Cable - 3m to the cart
Add 470-ABQB Dell Compatible, 100G QSFP28 to 4xSFP28 Passive Breakout DAC Cable - 1m to the cart
Add DAC-Q28-100G-3M Dell Compatible, 100G QSFP28 Passive DAC Cable - 3m to the cart
Add DAC-Q28-100G-1M Dell Compatible, 100G QSFP28 Passive DAC Cable - 1m to the cart
Add QSFP-DD-400G-CU1M Cisco Compatible, 400G QSFP-DD Passive DAC Cable - 1m to the cart
Add SFP-H25GB-CU1M Cisco Compatible, 25G SFP28 Passive DAC Cable - 1m to the cart
Add QSFP-4SFP25G-CU3M Cisco Compatible, 100G QSFP28 to 4xSFP25G Passive Breakout DAC Cable - 3m to the cart
Add QSFP-4SFP25G-CU1M Cisco Compatible, 100G QSFP28 to 4xSFP25G Passive Breakout DAC Cable - 1m to the cart
Add QSFP-100G-CU3M Cisco Compatible, 100G QSFP28 Passive DAC Cable - 3m to the cart
Add QSFP-100G-CU1M Cisco Compatible, 100G QSFP28 Passive DAC Cable - 1m to the cart
Add MCP7Y50-N001 Compatible 800G OSFP to 4x200G OSFP Breakout DAC Cable - 1M | NVIDIA / Mellanox to the cart
Add MCP7H50-H002R26 Compatible 200G QSFP56 to 2x100G QSFP56 Breakout DAC Cable - 2M | Mellanox / NVIDIA to the cart
Add MCP7H50-H001R30 Compatible 200G QSFP56 to 2x100G QSFP56 Breakout DAC Cable - 1M | Mellanox / NVIDIA to the cart
Add MCP1660-W001E30 Mellanox Compatible, 400G QSFP-DD Passive DAC Cable - 1m to the cart
Add MCP2M00-A001 Mellanox Compatible, 25G SFP28 Passive DAC Cable - 1m to the cart
Add MCP7F00-A003 Mellanox Compatible, 100G QSFP28 to 4xSFP28 Passive Breakout DAC Cable - 3m to the cart
Add MCP7F00-A001 Mellanox Compatible, 100G QSFP28 to 4xSFP28 Passive Breakout DAC Cable - 1m to the cart
Add MCP1650-H002E26 Mellanox Compatible, 200G QSFP56 Passive DAC Cable - 2m to the cart
Add MCP1600-C003 Mellanox Compatible, 100G QSFP28 Passive DAC Cable - 3m to the cart
Add MCP1600-C001 Mellanox Compatible, 100G QSFP28 Passive DAC Cable - 1m to the cart
Add Cisco SFP-H10GB-CU1M 10GBASE-CU SFP+ Direct-Attach Cable, Refurbished to the cart
Add Cisco SFP-H10GB-CU3M 10GBASE-CU SFP+ Direct-Attach Cable, New to the cart
Add Cisco SFP-H10GB-CU3M 10GBASE-CU SFP+ Direct-Attach Cable, Refurbished to the cart
Add Cisco QSFP-H40G-CU1M 40GBASE-CR4 QSFP+ Direct-Attach Cable, New to the cart
Add Cisco QSFP-H40G-CU1M 40GBASE-CR4 QSFP+ Direct-Attach Cable, Refurbished to the cart
Add Cisco QSFP-100G-CU1M Compatible 100G QSFP28 Passive DAC Twinax Cable - 1m to the cart
Add MCP1650-H001E30 Mellanox Compatible, 200G QSFP56 Passive DAC Cable - 1m to the cart
Add MCP1660-W002E30 NVIDIA/Mellanox Compatible 400Gb/s QSFP-DD Passive DAC Cable - 2m to the cart
Add MCP7Y00-N002 NVIDIA/Mellanox Compatible 800Gb/s OSFP to 2x400Gb/s OSFP Passive Breakout DAC Cable - 2m to the cart
The Dirty Connector Problem: MPO Inspection and Cleaning

Contamination is the leading cause of fiber link failure, and one dirty position on an MPO ferrule presents as a...

My Optic Won't Link: Reading DOM and Working the Optical Loss Budget

Before replacing a transceiver, read its DOM. Transmit and receive power split a dead link into three buckets in under...

What Can You Actually Run on a 48GB NVIDIA A40? Measured Model Sizes and Tokens Per Second (2026)

One A40 48GB runs 27–34B models at 23–29 tokens/sec, fits a 70B at Q4 at 12–13.5 tokens/sec, and serves 1,705...

The Dirty Connector Problem: MPO Inspection and Cleaning

Contamination is the leading cause of fiber link failure, and one dirty position on an MPO ferrule presents as a failing module. The inspect-clean-inspect discipline, the right tools, what never to do, and the symptom patterns that should send you to the scope instead of the spares shelf.

My Optic Won't Link: Reading DOM and Working the Optical Loss Budget

Before replacing a transceiver, read its DOM. Transmit and receive power split a dead link into three buckets in under a minute. Per-lane readings, the loss budget arithmetic, and the failures DOM is blind to.

What Can You Actually Run on a 48GB NVIDIA A40? Measured Model Sizes and Tokens Per Second (2026)

One A40 48GB runs 27–34B models at 23–29 tokens/sec, fits a 70B at Q4 at 12–13.5 tokens/sec, and serves 1,705 tokens/sec of aggregate output on an 8B model at 100 concurrent requests. The measured numbers, the KV cache math behind the 72B cliff, and the three things an Ampere card cannot do.

Keith L.