Granzon Full Armor GPU Water Block and Backplate For NVIDIA GeForce RTX 4080 AIC Reference (GBN-RTX4080H)
Includes CNC backplate
In this gallery — tap to open full size

Granzon Full Armor GPU Water Block and Backplate For NVIDIA GeForce RTX 4080 AIC Reference (GBN-RTX4080H)

GBN-RTX4080H Only 3 left in Boise, ID
$359.99USDFree shipping, lower 48

US import duties and tariffs are included in every price.

Ships the same business day on orders placed before 2:00 PM MST. Overnight delivery available at checkout.
Ships directly from our Idaho inventory. You avoid overseas sellers, processing delays, international shipping, customs hold-ups and additional fees.
Fits these 4 boards, and only these

This part is machined for the 4 boards listed below — nothing else. Board revisions and partner designs differ, so match your exact model against the list before you order.

  • NVIDIA NVIDIA 4080 - GEFORCE RTX 4080 AIC REFERENCE
  • GALAX NVIDIA 4080 - GEFORCE RTX 4080
  • GALAX NVIDIA 4080 - GEFORCE RTX 4080 SG
  • GAINWARD NVIDIA 4080 - GEFORCE RTX 4080 PHANTOM "GS"
Not sure? Send us your model/part number and we'll confirm it for you.
or ready to checkout now
Building your first loop? Plan the rest of it
Why buy it here
US warranty, handled in Boise
Claims are settled here, by the people who sold it to you.
Exclusive US distributor
The official US source for Bykski, so every part is genuine.

What installing it actually involves

Three steps, in the order that matters. The one people get wrong is the first.

01
Confirm the hardware

This block fits 4 boards:

  • NVIDIA NVIDIA 4080 - GEFORCE RTX 4080 AIC REFERENCE
  • GALAX NVIDIA 4080 - GEFORCE RTX 4080
  • GALAX NVIDIA 4080 - GEFORCE RTX 4080 SG
  • GAINWARD NVIDIA 4080 - GEFORCE RTX 4080 PHANTOM "GS"

Match your exact model — not the family.

02
Mount it dry

Thermal interface material as supplied. Even mounting pressure, correct bracket orientation, no over-torquing.

03
Leak test before power

Run the pump on a bench supply with the rest of the system unpowered. 24 hours is the standard, an hour is the minimum.

Water cooling parts are designed for self-installation by qualified users. Damage caused by installation error isn't covered — if you're unsure at any step, ask before you power the loop.

About this part

Granzon gives you the power to perform at your peak and create stunning visuals. We push the boundaries of innovation, and our products are unrivaled in quality. Our products are a perfect blend of art and technology. This full armor block directly cools the video cards core (GPU), graphics memory (RAM), and voltage regulator modules (VRM). By directly cooling these components, you can achieve great temperatures and reach higher overclocks or extend the overall lifespan of your card by running at below-factory temperatures.

The block is constructed of high-purity copper that is nickel electroplated to prevent oxidation. The base and top are wrapped in full aluminum armor, creating a stunning visual look. Top and bottom ports can be used to configure parallel or serial designs in multi-block setups.

In the box
  • 1x Full Coverage GPU Water Block
  • 1x Frontplate Armor
  • 1x Backplate Armor
  • 2x Stop Fitting
  • 1x Mounting Hardware
  • Thermal grease
If the gallery shows a parts diagram, that diagram is the source of truth for what ships.
Datasheet
Block MaterialNickel Electroplated High Purity Copper
Armor MaterialBlack Anodized Aluminum (not in contact with coolant)
SKUGBN-RTX4080H

What buyers said

Left by people who bought this part here. Compatibility reports are the useful ones — if you fitted it, say which board.

Customer Reviews

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Questions people ask about this part

Answers specific to GBN-RTX4080H. If yours isn't here, ask — we'd rather talk you out of the wrong part than sell you one.

What does this part fit?

It is machined for 4 boards:

  • NVIDIA NVIDIA 4080 - GEFORCE RTX 4080 AIC REFERENCE
  • GALAX NVIDIA 4080 - GEFORCE RTX 4080
  • GALAX NVIDIA 4080 - GEFORCE RTX 4080 SG
  • GAINWARD NVIDIA 4080 - GEFORCE RTX 4080 PHANTOM "GS"

Bykski cut these to a specific hardware layout, so match your exact model rather than the family before ordering. Part number GBN-RTX4080H.

Is it in stock, and when will it ship?
Yes — only 3 left in Boise, Idaho. Orders placed before 2:00 PM MST on a business day ship the same day — we do not ship weekends or US holidays. Overnight delivery is available at checkout.
Can I return it if it turns out not to fit?
Yes. Returns are accepted within 30 days and are easy to start in the support center. Unopened items can be returned for store credit with no restocking fee; other returns carry a restocking fee, higher for items that have been installed or used. So we would rather check the fit with you first: send us the model and we will check it against this part.
Will I pay import duties or customs charges on delivery?
Not on a US order. US import duties and tariffs are already included in the price, so nothing is collected at the door and there is no brokerage fee. Orders shipped outside the US may owe that country's customs fees and duties.
Who handles the warranty?
BYKSKI.US, the exclusive US distributor, from Boise, Idaho. Claims are handled domestically rather than returned to an overseas factory. Damage caused by installation error is not covered.
Is shipping free?
Yes — shipping is included at this price for addresses in the lower 48 US states.
Are printed instructions included?
No printed manual is included. Installation references are in the product gallery images, and the install guides on this site cover the process step by step.
Do I need anything else to use it?
A water block is one component of a loop: you also need a pump, a radiator, fittings, tubing and coolant. If you are starting from nothing, an AIO or a distro-plate kit is the shorter route — ask and we will spec it.

Ask us before you order

Send your exact hardware model and we'll confirm the right part before you spend $359.99 — or tell you honestly that this isn't the one.

Returns are accepted within 30 days and are easy to start in the support center. Unopened items can be returned for store credit with no restocking fee; other returns carry a restocking fee, higher for items that have been installed or used.

Ask about compatibility