Bykski Full Coverage GPU Water Block and Backplate For ASUS TUF Gaming GeForce RTX 4090 24GB OG (N-AS4090TUFOG-X)
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PrimoChill SX fittings for the G1/4 ports, in stock in Boise. Pick a finish and how many you need; 6+ in any mix and the price drops.
About this part
The Bykski N-AS4090TUFOG-X is a full-coverage GPU water block with backplate for builders moving their graphics card into a custom water loop. It fits the ASUS TUF Gaming GeForce RTX 4090 24GB OG and the other cards it fits, and is shaped for those circuit boards only.
The block draws heat straight from the GPU chip, the memory and the power stages, so the whole card runs cooler than on its stock cooler. Lower temperatures leave room for higher overclocks and help the card last longer. The nickel-plated copper base sits under a clear acrylic top with built-in 5V addressable RGB lighting.
- GPU Water Cooling Block
- Installation Hardware, including thermal paste
- 5v Addressable RGB (RBW)
Technical specifications 9 specs
| Brand | Bykski |
|---|---|
| Model | N-AS4090TUFOG-X |
| Type | Full-coverage GPU water block with backplate |
| Block Material | Nickel Electroplated High Purity Copper / PMMA (Acrylic) |
| Backplate Material | Black Anodized Aluminum (not in contact with coolant) |
| Dimensions | 267.9 x 157.25 x 30.19 mm |
| Port Thread | G1/4 |
| Lighting | 5V Addressable RGB |
| Cooled Components | GPU, memory, power stages |
What buyers said
Left by people who bought this part here. Compatibility reports are the useful ones — if you installed it, say which board.
What installing it actually involves
Three steps, in the order that matters. The one people get wrong is the first.
This block fits 6 boards:
- ASUS NVIDIA 4090 - TUF GAMING GEFORCE RTX 4090 24GB OG
- ASUS NVIDIA 4090 - ROG STRIX LC GEFORCE RTX 4090 24GB GAMING
- ASUS NVIDIA 4070 - TUF GAMING GEFORCE RTX 4070 Ti SUPER 16GB OG
- ASUS NVIDIA 4070 - TUF GAMING GEFORCE RTX 4070 Ti SUPER 16GB OG OC
- ASUS NVIDIA 4090 - ROG STRIX LC GEFORCE RTX 4090 24GB OC GAMING
- ASUS NVIDIA 4090 - TUF GAMING GEFORCE RTX 4090 24GB OG OC
Match your exact model — not the family.
Thermal interface material as supplied. Even mounting pressure, correct bracket orientation, no over-torquing.
Run the pump on a bench supply with the rest of the system unpowered. 24 hours is the standard, an hour is the minimum.
Questions people ask about this part
Answers specific to N-AS4090TUFOG-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:
- ASUS NVIDIA 4090 - TUF GAMING GEFORCE RTX 4090 24GB OG
- ASUS NVIDIA 4090 - ROG STRIX LC GEFORCE RTX 4090 24GB GAMING
- ASUS NVIDIA 4070 - TUF GAMING GEFORCE RTX 4070 Ti SUPER 16GB OG
- ASUS NVIDIA 4070 - TUF GAMING GEFORCE RTX 4070 Ti SUPER 16GB OG OC
- ASUS NVIDIA 4090 - ROG STRIX LC GEFORCE RTX 4090 24GB OC GAMING
- ASUS NVIDIA 4090 - TUF GAMING GEFORCE RTX 4090 24GB OG OC
These are machined to a specific hardware layout, so match your exact model rather than the family before ordering. Part number N-AS4090TUFOG-X.
Is it in stock, and when will it ship?
Can I cancel my pre-order?
Will I pay import duties or customs charges on delivery?
Who handles the warranty?
Is shipping free?
Are printed instructions included?
Do I need anything else to use it?
Ask us before you order
Send your exact hardware model and we'll confirm the right part before you spend $275.99 — 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.