Bykski GPU Backside Water Block for Nvidia RTX 3090 Video Memory (B-3090TC-X)
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Bykski GPU Backside Water Block for Nvidia RTX 3090 Video Memory (B-3090TC-X)

B-3090TC-X Only 7 left in Boise, ID
$119.99USDFree shipping over $125

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.

  • (Including but not limited to the following models)
  • All Series Nvidia RTX 3090
  • *other series such as 3080 3070 2080, etc. are not compatible
  • This product is not compatible with the backplate of Bykski X series GPU block!
  • If you using the Bykski GPU block, please install it directly on the back of the PCB, or use stock backplate.
  • Please check over the installation PCB picture after narrowing your selection to ensure compatibility. If you have any questions, please contact support for confirmation.
  • Compatibility based on these circuit board designs only
  • Fittings: G 1/4in. Thread
Not sure? Send us your model/part number and we'll confirm it for you.
or ready to checkout now
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.

01
Confirm the hardware

All Series Nvidia RTX 3090 — the exact model, not the family. Partner boards differ.

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.

About this part

This universal RTX 3090 VRAM block directly cools the video cards graphics memory (RAM) located on the backside of the card. Most stock backplates are inadequate cooling solutions for this area. By directly cooling these components the cards overall performance and stability will be more stable.

The block is constructed of high purity copper that is electroplated to prevent oxidation.

In the box
  • 1x Universal Backside Water Block for RTX 3090 Video Memory
  • 1x Mounting Hardware
  • Thermal pads
If the gallery shows a parts diagram, that diagram is the source of truth for what ships.
Datasheet
Block MaterialElectroplated High Purity Copper / Clear Acrylic
SKUB-3090TC-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.

Customer Reviews

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Questions people ask about this part

Answers specific to B-3090TC-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 All Series Nvidia RTX 3090. Bykski cut these to a specific hardware layout, so confirm the exact model rather than the family before ordering. Part number B-3090TC-X.
Is it in stock, and when will it ship?
Yes — only 7 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?
Shipping is free on orders over $125 to 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 $119.99 — 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