Bykski Durable GPU Water Block and Backplate for ASUS TUF Gaming GeForce RTX 4090 24GB OG (N-AS4090TUFOG-X-V2) - Continuous Usage

Bykski Durable GPU Water Block and Backplate for ASUS TUF Gaming GeForce RTX 4090 24GB OG (N-AS4090TUFOG-X-V2) - Continuous Usage
Includes CNC backplate
In this gallery — tap to open full size
N-AS4090TUFOG-X-V2 Pre-order
$323.99$356.99USDFree shipping, lower 48

US import duties and tariffs are included in every price.

Ships directly from our Idaho inventory. You avoid overseas sellers, processing delays, international shipping, customs hold-ups and additional fees.
Pre-order — normally stocked
Expect dispatch in about 31 business days
Latest 35 business days. Cancel any time before it ships for a full refund.
A regular catalog item — we're between shipments. Your order is filled before any stock goes back on the website.
Fits these 6 boards, and only these

This part is machined for the 6 boards listed below — nothing else. Board revisions and partner designs differ, so match your exact model against the list before you order.

  • ASUS NVIDIA 4090 - TUF GAMING GEFORCE RTX 4090 24GB OG
  • ASUS NVIDIA 4090 - ROG STRIX LC GEFORCE RTX 4090 24GB GAMING
  • ASUS NVIDIA 4090 - ROG STRIX LC GEFORCE RTX 4090 24GB OC GAMING
  • ASUS NVIDIA 4070 - TUF GAMING GEFORCE RTX 4070 Ti SUPER 16GB OG
  • ASUS NVIDIA 4070 - TUF GAMING GEFORCE RTX 4070 Ti SUPER 16GB OG OC
  • ASUS NVIDIA 4090 - TUF GAMING GEFORCE RTX 4090 24GB OG OC
Not sure? Send us your model/part number and we'll confirm it for you.
Not ready to pre-order?
Fittings for this block

PrimoChill SX fittings for the G1/4 ports, in stock in Boise. Pick a finish and how many you need; 6+ in any mix and the price drops.

Pick a finish, then add quantities.
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.
Custom watercooling since 2002
PrimoChill, from Boise, Idaho.

About this part

The Bykski N-AS4090TUFOG-X-V2 is a full-cover GPU water block with backplate for builders adding their graphics card to a custom water-cooling loop. It is made for the ASUS TUF Gaming GeForce RTX 4090 24GB OG and the other cards it fits.

Built for continuous use, it pairs a nickel-plated high-purity copper base with stainless steel and POM, and the plating protects the copper from oxidation. A stainless steel panel keeps the block just 6 mm thick, and its high-flow design lets several blocks run in series in the same loop.

In the box
  • GPU Water Cooling Block with backplate
  • Installation Hardware, including thermal paste
If the gallery shows a parts diagram, that diagram is the source of truth for what ships.
Datasheet
Technical specifications 8 specs
BrandBykski
ModelN-AS4090TUFOG-X-V2
TypeFull-cover GPU water block with backplate
Block MaterialNickel Electroplated High Purity Copper / Stainless Steel / POM
Backplate MaterialBlack Anodized Aluminum
Dimensions266.95 x 135.47 x 6 mm
Port ThreadG1/4
LightingNone

What buyers said

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

Customer Reviews

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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 6 boards:

  • ASUS NVIDIA 4090 - TUF GAMING GEFORCE RTX 4090 24GB OG
  • ASUS NVIDIA 4090 - ROG STRIX LC GEFORCE RTX 4090 24GB GAMING
  • ASUS NVIDIA 4090 - ROG STRIX LC GEFORCE RTX 4090 24GB OC GAMING
  • ASUS NVIDIA 4070 - TUF GAMING GEFORCE RTX 4070 Ti SUPER 16GB OG
  • ASUS NVIDIA 4070 - TUF GAMING GEFORCE RTX 4070 Ti SUPER 16GB OG OC
  • ASUS NVIDIA 4090 - TUF GAMING GEFORCE RTX 4090 24GB OG OC

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.

Custom water cooling is installed by you, at your own risk. We are not responsible for leaks, or for damage to your parts or system. If you're unsure at any step, ask before you power the loop.

Questions people ask about this part

Answers specific to N-AS4090TUFOG-X-V2. 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 6 boards:

  • ASUS NVIDIA 4090 - TUF GAMING GEFORCE RTX 4090 24GB OG
  • ASUS NVIDIA 4090 - ROG STRIX LC GEFORCE RTX 4090 24GB GAMING
  • ASUS NVIDIA 4090 - ROG STRIX LC GEFORCE RTX 4090 24GB OC GAMING
  • ASUS NVIDIA 4070 - TUF GAMING GEFORCE RTX 4070 Ti SUPER 16GB OG
  • ASUS NVIDIA 4070 - TUF GAMING GEFORCE RTX 4070 Ti SUPER 16GB OG OC
  • ASUS NVIDIA 4090 - TUF GAMING GEFORCE RTX 4090 24GB OG OC

These are machined to a specific hardware layout, so match your exact model rather than the family before ordering. Part number N-AS4090TUFOG-X-V2.

Is it in stock, and when will it ship?
It is a normally stocked item currently on pre-order — we are between shipments. Orders dispatch from Boise, Idaho within 31 business days, and pre-orders are filled before any stock goes back on the website.
Can I cancel my pre-order?
Yes. A pre-order can be canceled any time before it ships, for a full refund. Nothing is committed until it leaves Boise.
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?
PrimoChill, from Boise, Idaho. Every claim is handled directly by our support team rather than returned to an overseas factory. Installation is at your own risk: we are not responsible for leaks or damage to other hardware.
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 $323.99 — 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