Bykski Durable Metal GPU Water Block and Backplate For NVIDIA GeForce RTX 5090 Founders Edition (N-RTX5090FE-SR) - Continuous Usage
US import duties and tariffs are included in every price.
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-RTX5090FE-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-RTX5090FE-SR is a full-cover metal GPU water block with backplate for custom liquid-cooled workstations, servers and data-center builds that run around the clock. It fits the NVIDIA GeForce RTX 5090 Founders Edition and cools the GPU chip, memory and power stages in one pass.
A jet impingement cold plate drives coolant through 56 fine microchannels right over the GPU chip, pulling heat away quickly under sustained load. The all-metal build, with no acrylic, is made for machines that stay on, and an anodized aluminum backplate stiffens the board against flexing. Standard G1/4 ports connect it to an existing loop.
- GPU water block with backplate: 1
- Thermal paste: 1
- 1.5 mm thermal pads: 5
- 0.5 mm washers: 4
- Spring screws: 4
- Backplate screws: 4
- M2 x 5 mm cross flat head screws: 8
- M1.5 x 4 mm cross flat head screws: 2
- Backplate brackets: 2
- M2 x 3 mm flat head screws: 8
- PCI-E bracket: 1
- M3 x 5 mm flat head screws: 3
Technical specifications 21 specs
| Model | N-RTX5090FE-SR |
|---|---|
| Base Material | Nickel-Plated T2 Copper |
| Top Panel Material | Nickel-Plated Copper |
| Backplate Material | Anodized Aluminum |
| Sealing O-Ring | EPDM |
| Nickel Plating Thickness | 0.001 mm - 0.002 mm |
| Base Plate Thickness | 9.5 mm |
| Base Plate Core Thickness | 0.35 mm |
| Copper Plate Length | 136.55 mm |
| Microchannel Width | 0.3 mm |
| Microchannel Count | 56 |
| Heat Dissipation Area | 15565.30 mm2 |
| Water Block Dimensions | 234.35 x 121.82 x 22.70 mm |
| Backplate Dimensions | 222.16 x 121.82 x 10.96 mm |
| Net Weight | 1.5 kg |
| Thread | G1/4 |
| Maximum Working Pressure | 2 bar |
| Operating Temperature Range | -20 to 60 C |
| Cooling Method | Jet Impingement |
| Supported Fluids | Water, Ethylene Glycol, Propylene Glycol, Fluorinated Fluid, Mineral Oil |
| 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-RTX5090FE-SR-360 |
 N-RTX5090FE-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 5090 - GEFORCE RTX 5090 FOUNDERS EDITION — 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-RTX5090FE-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 $323.99 — 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.