Bykski GPU Water Block and Backplate For ASUS ROG Astral Gaming GeForce RTX 5090 32GB BTF OC (N-AS5090MATRIX-X)

Includes CNC backplate

In this gallery — tap to open full size

N-AS5090MATRIX-X Pre-order

$233.99$299.99USDFree 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 20 business days

Latest 24 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 2 boards, and only these

This part is machined for the 2 boards listed below — nothing else. Board revisions and partner designs differ, so match your exact model against the list before you order.

ASUS NVIDIA 5090 - ROG ASTRAL GAMING GEFORCE RTX 5090 32GB BTF OC
ASUS NVIDIA 5090 - ROG MATRIX PLATINUM GEFORCE RTX 5090 32GB 30TH

Not sure? Send us your model/part number and we'll confirm it for you.

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.

About this part

The Bykski N-AS5090MATRIX-X is a full-cover GPU water block with an aluminum backplate, made for builders running a custom water loop who want their graphics card cooled by the loop instead of by fans. It fits the ASUS ROG Astral Gaming GeForce RTX 5090 32GB BTF OC and the ASUS ROG Matrix Platinum GeForce RTX 5090 32GB 30TH.

One nickel-plated T2 copper block draws heat from the GPU chip, the memory and the power stages at once, so the whole board is cooled by the coolant. Its 56 micro-channels spread the flow across the cold plate, and with the stock fans gone the card runs quietly. Built-in 5V addressable RGB lets the block match the rest of your lighting.

In the box

GPU water block with backplate: 1
1.5 mm thermal pads: 5
Thermal paste: 1
Backplate screws: 10

If the gallery shows a parts diagram, that diagram is the source of truth for what ships.

Datasheet

Technical specifications 14 specs

Cold Plate Material	Nickel-plated T2 copper
Top Material	Acrylic
Backplate Material	Aluminum
Plating Thickness	0.001 mm - 0.002 mm electroless nickel
Cold Plate Thickness	8.5 mm
Base Thickness Under Channels	0.35 mm
Copper Plate Length	160.6 mm
Micro-Channel Width	0.3 mm
Micro-Channel Count	56
Micro-Channel Surface Area	14,393.42 mm2
Water Block Dimensions	260.82 x 162.33 x 26.15 mm
Port Thread	G1/4
Lighting	5V ARGB, 3-pin header
Warranty	1 year

What buyers said

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

What installing it actually involves

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

Confirm the hardware

This block fits 2 boards:

ASUS NVIDIA 5090 - ROG ASTRAL GAMING GEFORCE RTX 5090 32GB BTF OC
ASUS NVIDIA 5090 - ROG MATRIX PLATINUM GEFORCE RTX 5090 32GB 30TH

Match your exact model — not the family.

Mount it dry

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

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-AS5090MATRIX-X. 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 2 boards:

ASUS NVIDIA 5090 - ROG ASTRAL GAMING GEFORCE RTX 5090 32GB BTF OC
ASUS NVIDIA 5090 - ROG MATRIX PLATINUM GEFORCE RTX 5090 32GB 30TH

Bykski cut these to a specific hardware layout, so match your exact model rather than the family before ordering. Part number N-AS5090MATRIX-X.

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 20 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?

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 $233.99 — 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