Bykski Durable All Metal GPU Water Block and Backplate For NVIDIA GeForce RTX 4080 SUPER 32GB (N-RTX4080S-SR) - Continuous Usage
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This block with radiator, pump and fans, pre-filled and sealed. No loop to build.
360 All-in-One (AIO), 3 x 120mm fans
B-FRD-RTX4080S-SR-360
$549.99See the kit →
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-RTX4080S-SR is a continuous-duty liquid cooling block for NVIDIA GeForce RTX 4080 SUPER 32GB graphics cards. It covers the GPU chip, memory, and power stages in one pass. Removing the stock heatsink transfers the card's thermal load directly to the liquid cooling loop.
Machined from T2 copper with 0.001-0.002 mm electroless nickel plating, the 9.5 mm cold plate features a 0.35 mm base over the GPU core and 56 micro-channels that are 0.3 mm wide. The nickel-plated copper top and EPDM seal are rated for up to 4 bar working pressure, and an aluminum backplate supports the circuit board.
- GPU water block with backplate: 1
- 1.5 mm thermal pads: 5
- 0.5 mm gaskets: 4
- M2 x 5 mm spring screws: 4
- M2 x 10.3 mm backplate screws: 8
Technical specifications 22 specs
| Product Type | GPU Water Block |
|---|---|
| Model | N-RTX4080S-SR |
| Compatibility | NVIDIA GeForce RTX 4080 SUPER 32GB |
| Block Material | Nickel-Plated T2 Copper |
| Top Panel Material | Nickel-Plated Copper |
| Backplate Material | Aluminum |
| Cold Plate Base Thickness | 0.35 mm |
| Total Cold Plate Thickness | 9.5 mm |
| Cold Plate Length | 196 mm |
| Micro-Channel Fin Width | 0.3 mm |
| Micro-Channel Count | 56 |
| Channel Surface Area | 15565.2954 mm2 |
| Plating | Electroless Nickel Plating (0.001 mm - 0.002 mm) |
| Sealing Material | EPDM |
| Port Thread | G1/4 |
| Working Pressure | Max 4 bar |
| Operating Temperature | -20 C to 60 C |
| Coolant Compatibility | Water, Ethylene Glycol, Propylene Glycol, Fluorinated Liquid, Mineral Oil |
| Block Dimensions | 277.64 x 101.98 x 17.0 mm |
| Backplate Dimensions | 266.67 x 101.95 x 3.96 mm |
| Net Weight | 1.5 kg |
| Warranty | 1 Year |
Sealed kit, or just the block
Same cold plate, two ways to buy it, and what happens if you keep the cooler the card shipped with.
 B-FRD-RTX4080S-SR-360 |
 N-RTX4080S-SR | Stock cooling
As the card ships
|
|
|---|---|---|---|
| You already have | A case with a 360 mm radiator mount. Nothing else. | A working water-cooling loop: pump, radiator, reservoir, fittings, coolant. | The card and the cooler it came with: a passive fin stack or a small blower, built to be fed by a server's front-to-back airflow. |
| Day one | Remove the stock cooler, install the pads and the block, mount the radiator. Done. | Same block install, then plumb it into your loop, fill and bleed. | Plug it in. In a rack with a cold aisle it runs as designed. In a workstation or desktop case, nothing pushes air through the fin stack. |
| Serviceable | Sealed. Nothing to fill, bleed or top up. | Every part, because it is your loop. | Nothing to service, and nothing to improve: the cooler can only move the heat the case pushes through it. |
| Best for | Servers and workstations that need it running this week. | A build that already has water in it. | The rack it was designed for. Not a desktop, a workstation or an open bench, where it throttles under sustained load. |
| Where to buy it | $549.99 · See the kit | This page | You already own it. |
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.
NVIDIA NVIDIA 4080 - GEFORCE RTX 4080 SUPER 32GB — the exact model, not the family. Partner boards differ.
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-RTX4080S-SR. 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?
Is it in stock, and when will it ship?
Can I return it if it turns out not to fit?
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 $287.99 — 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.