Bykski GPU Water Block For NVIDIA GeForce RTX 5090 Founders Edition

The Bykski N-RTX5090FE-SR is a full-cover metal GPU water block with backplate for the NVIDIA GeForce RTX 5090 Founders Edition. It is made for custom liquid-cooled workstations, servers and data-center machines that run continuously, and cools the GPU chip, memory and power stages in one pass.

Why it works

• Jet impingement cooling through 56 microchannels on a 9.5 mm T2 copper base
• Full metal build: nickel-plated copper top and nickel-plated T2 copper base
• Supports water, ethylene glycol, propylene glycol, fluorinated fluid and mineral oil
• Anodized aluminum backplate reinforces the board
• Standard G1/4 ports, rated to 2 bar

Compatibility

• NVIDIA NVIDIA 5090 - GEFORCE RTX 5090 FOUNDERS EDITION

Specifications

• Block Material: Nickel-plated T2 copper, nickel-plated copper top
• Backplate Material: Anodized aluminum (not in contact with coolant)
• Dimensions: 234.35 x 121.82 x 22.70 mm (width includes ports)
• Port Thread: G1/4

In the box

• GPU water block with backplate: 1
• Thermal paste: 1
• 1.5 mm thermal pads: 5
• 0.5 mm washers: 4
• Spring screws: 4
• Backplate screws: 4
• M2 x 5 mm cross flat head screws: 8
• M1.5 x 4 mm cross flat head screws: 2
• Backplate brackets: 2
• M2 x 3 mm flat head screws: 8
• PCI-E bracket: 1
• M3 x 5 mm flat head screws: 3

Installation

• Remove the card's stock heatsink. After this the card can no longer be cooled by chassis air.
• Clean the GPU chip and board surfaces.
• Apply the included thermal paste and 1.5 mm thermal pads.
• Fit the block and secure it with the spring screws and washers.
• Attach the backplate with the backplate screws and brackets, then fit the PCI-E bracket.
• Connect the G1/4 ports to your loop, fill it and leak test it.

Warnings

Never power the card without the loop installed and the pump running.

Thermal pads go where the block has raised contact points; the GPU chip takes thermal paste.

No printed instructions are included; the installation illustration is in the product images.

Self-installation by users experienced with PC water cooling. The manufacturer may update the design, so the product you receive may differ slightly from the images. The manufacturer is not liable for damage caused by misuse, improper installation, operation outside the stated specifications, or incompatible hardware or fluids. Installing and using this product means you accept these risks.