Bykski Full Coverage GPU Water Block and Backplate for Asrock RX6900 XT OC Formula 16G (A-AR6900XTOCF-X)

Includes CNC backplate

In this gallery — tap to open full size

4.8 (6) 4.8 out of 5 stars, 6 reviews Read the reviews

A-AR6900XTOCF-X Only 3 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 one thing, and only one

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

ASROCK AMD 6900 - RADEON RX 6900 XT OC FORMULA 16GB

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

This full coverage 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 along with the ability to reach higher overclocks or extend the overall lifespan of your card by running at below factory temps.

In the box

1x Full Coverage GPU Water Block
1x Backplate
2x Stop Fitting
1x Mounting Hardware
Thermal grease
1x 5v A-RGB (RBW) Light
(Warning: Addressable RGB (RBW) is 5V and is ONLY compatible with Addressable RGB (RBW) components. RGB is 12V and is ONLY compatible with RGB components. Mix and match will NOT work and will cause damage.

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

Datasheet

SKUA-AR6900XTOCF-X

What buyers said

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

Great water block

Well made and temperatures are great. I always buy from Byski.us , best store for your water cooling needs.

Great product worked as expected

This was the most nerve wracking part of my first custom water cooling rig since there are so many video card makers. I have the Asrock RX6950 XT OC Formula card and had to confirm that this product would fit. Customer support was able to answer my question. The only thing I'd like to see improved is the documentation. The documentation was really fine print and I end up looking up my disassembly on YouTube and previous reviewers for tips to install properly.

Installation aside, the working system is pretty. I have it hooked into my MB ARGB sync.

Great water block

Took awhile to receive water block but customer service was top notch about keeping me in the loop. As for the water block itself performs excellent. Keeps my AsRock 6950 OCF at 50c core 72c hotspot overclocked @ 2920mhz core, 2400mhx memory @ 1.225v and 20% power boost with MPT. Great product!

Works perfectly, thermal pad layout very important.

The block is fantastic, there was a little bit of oil residue inside the block that I had to clean out before installing it, though anyone doing a custom loop should flush their equipment first. The thermal pads didn't have much explanation but I can give a good breakdown here:

You can not use ANY of the stock thermal pads on the front of the PCB, you MUST use the ones included with the block and only put them in the exact locations as the directions state. Nowhere else. However, you can reuse the stock thermal pads on the back of the PCB for additional memory/VRM cooling. They fit nearly perfectly and there is no PCB flexing or bending when you use the stock thermal pads underneath the backplate.

Just to reiterate, you need to use the thermal pads that are included with the block on the front side of the PCB, but you can use the stock thermal pads that are included with the GPU on the back side of the PCB.

Other than some minor confusion with the thermal pads, everything else is perfect, the fit is great and the mounting pressure is very even. Keeps my ASRock 6950XT OC Formula nice and chilly. Able to sustain 2.75GHz on the core and 2.35GHz on the memory. GPU average temp typically sits around 42c and hotspot around 56c under full load at +20% power target & 1.2v Vcore. Smokes the 3090 in most games and typically matches the 3090Ti in non-raytraced games. Very, very happy!

Thermal Pad thickness

Water block is great. Cools well and fits perfect however, thermal pads that were provided were not the correct thickness and additional pads were needed for proper contact between gpu and cooler.

Hi Brandon,
Sorry to hear you had difficulties with the thermal pads. We'll be happy to help work out any problems if you reach out to us at support@bykski.us.

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What installing it actually involves

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

Confirm the hardware

ASROCK AMD 6900 - RADEON RX 6900 XT OC FORMULA 16GB — the exact model, not the family. Partner boards differ.

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 A-AR6900XTOCF-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 ASROCK AMD 6900 - RADEON RX 6900 XT OC FORMULA 16GB. Bykski cut these to a specific hardware layout, so confirm the exact model rather than the family before ordering. Part number A-AR6900XTOCF-X.

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. 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