Bykski Durable Metal/POM GPU Water Block and Backplate for ASUS TUF/ROG Gaming GeForce RTX 4090 24GB (SELECT MODELS ONLY) (N-AS4090TUFOG-X-V2) - Continuous Usage
Includes CNC backplate
In this gallery — tap to open full size
N-AS4090TUFOG-X-V2
Only 2 left in Boise, ID
$311.99USDFree 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.
ship now, on pre-order.We hold 2 in Boise; the balance follows around 20 business days from now. Tell us at checkout if you'd rather it all shipped together.
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.
ASUS NVIDIA 4090 - TUF GAMING GEFORCE RTX 4090 24GB OG
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.
About this part
Built for continuous use, the N-AS4090TUFOG-X-V2 water block features a combination of metal and POM, ensuring both safety and longevity. Its stainless steel panel design allows for an ultra-slim profile of the GPU block.
The block is made from high-purity copper and is electroplated to avoid oxidation. Its high-flow design enables several blocks to function in series.
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.
ASUS NVIDIA 4070 - TUF GAMING GEFORCE RTX 4070 Ti SUPER 16GB OG
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 4 boards:
ASUS NVIDIA 4090 - TUF GAMING GEFORCE RTX 4090 24GB OG
ASUS NVIDIA 4070 - TUF GAMING GEFORCE RTX 4070 Ti SUPER 16GB OG
Bykski cut these 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?
Yes — only 2 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. 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 $311.99 — 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.
Having trouble finding a compatible block for your card, or not sure your card works with this one? Send us your card model and we'll check it for you.
We'll email you back within two business days.
Thanks, we've got it. We'll email you back within two business days.
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