Bykski GPU Water Block and Backplate For AMD Radeon RX 7900 XTX (A-RX7900XTX-X)

Includes CNC backplate

In this gallery — tap to open full size

Bykski GPU Water Block and Backplate For AMD Radeon RX 7900 XTX (A-RX7900XTX-X)

3.0 (1) 3.0 out of 5 stars, 1 review Read the reviews

A-RX7900XTX-X Only 10 left in Boise, ID

$233.99USDFree 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 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.

XFX AMD 7900 - RADEON RX 7900 XTX SPEEDSTER MERC 310 24 GB
XFX AMD 7900 - RADEON RX 7900 XT SPEEDSTER MERC 310 20GB PRO
XFX AMD 7900 - RADEON RX 7900 XT SPEEDSTER MERC 310 20GB
VASTARMOR AMD 7900 - RADEON RX 7900 XTX ALLOY SUPER 24GB
XFX AMD 7900 - RADEON RX 7900 XTX SPEEDSTER MERC 310 20GB PRO
XFX AMD 7900 - RADEON RX 7900 XTX PHOENIX NIRVANA 24GB

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.

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 6 boards:

XFX AMD 7900 - RADEON RX 7900 XTX SPEEDSTER MERC 310 24 GB
XFX AMD 7900 - RADEON RX 7900 XT SPEEDSTER MERC 310 20GB PRO
XFX AMD 7900 - RADEON RX 7900 XT SPEEDSTER MERC 310 20GB
VASTARMOR AMD 7900 - RADEON RX 7900 XTX ALLOY SUPER 24GB
XFX AMD 7900 - RADEON RX 7900 XTX SPEEDSTER MERC 310 20GB PRO
XFX AMD 7900 - RADEON RX 7900 XTX PHOENIX NIRVANA 24GB

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.

About this part

The Bykski A-RX7900XTX-X full-coverage water block cools the GPU chip, video memory, and power stages. The nickel-plated copper plate routes coolant across core heat zones beneath a clear acrylic top.

Replacing the stock air cooler drops operating temperatures under load and removes fan noise from the chassis. The aluminum backplate braces the circuit board, and integrated 5V addressable RGB lighting connects to standard motherboard headers.

In the box

GPU water block with backplate: 1
1.5mm thermal pads: 5
M2 x 5mm flat head screws: 4
Backplate: 1
M2 x 9.5mm backplate screws: 8

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

Datasheet

Technical specifications 13 specs

Product Type	GPU Water Block with Backplate
Model	A-RX7900XTX-X
Cold Plate Material	Electroless Nickel-Plated T2 Copper
Top Material	Clear Acrylic (PMMA)
Backplate Material	Frosted Aluminum Alloy
Block Dimensions	263.65 x 137.06 x 23.15 mm
Backplate Dimensions	263.65 x 106.77 x 6.00 mm
Thread Type	G1/4
Plating Thickness	0.001-0.002 mm
Lighting Type	5V Addressable RGB (RBW)
Lighting Header	3-pin +5V
RGB Software Compatibility	ASUS Aura Sync, MSI Mystic Light Sync, ASRock Polychrome RGB, GIGABYTE RGB Fusion
Thermal Pad Thickness	1.5 mm

What buyers said

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

Good block but instructions were incorrect

The block performs well and is stunning visually. Unfortunately it did not include any instructions and the ones on the website are for the non-backplate model. It took me some time to figure out what screws I needed as they included both the set for backplate as well as no backplate.

Questions people ask about this part

Answers specific to A-RX7900XTX-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 6 boards:

XFX AMD 7900 - RADEON RX 7900 XTX SPEEDSTER MERC 310 24 GB
XFX AMD 7900 - RADEON RX 7900 XT SPEEDSTER MERC 310 20GB PRO
XFX AMD 7900 - RADEON RX 7900 XT SPEEDSTER MERC 310 20GB
VASTARMOR AMD 7900 - RADEON RX 7900 XTX ALLOY SUPER 24GB
XFX AMD 7900 - RADEON RX 7900 XTX SPEEDSTER MERC 310 20GB PRO
XFX AMD 7900 - RADEON RX 7900 XTX PHOENIX NIRVANA 24GB

Bykski cut these to a specific hardware layout, so match your exact model rather than the family before ordering. Part number A-RX7900XTX-X.

Is it in stock, and when will it ship?

Yes — only 10 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 $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