Bykski Durable 4x80mm 2U Server AIO Liquid CPU Cooler For AMD EPYC SP3 (LGA 4094) (B-FRDSRSP3-80-V3)
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Bykski Durable 4x80mm 2U Server AIO Liquid CPU Cooler For AMD EPYC SP3 (LGA 4094) (B-FRDSRSP3-80-V3)

B-FRDSRSP3-80-V3 Pre-order
$349.99USDFree shipping, lower 48

US import duties and tariffs are included in every price.

Ships directly from our Idaho inventory. You avoid overseas sellers, processing delays, international shipping, customs hold-ups and additional fees.
Pre-order — normally stocked
Expect dispatch in about 20 business days
Latest 24 business days. Cancel any time before it ships for a full refund.
A regular catalogue item — we're between shipments. Your order is filled before any stock goes back on the website.
What this works with

Check these against your build before you order. If anything here does not match what you have, ask us first — it is cheaper than a return.

  • AMD EPYC 7001 / 7002 / 7003 - ANY EPYC 7XXX
Not sure? Send us your model/part number and we'll confirm it for you.
Which socket is my CPU? Find your CPU's generation and read the socket and the mounting pattern.
Not ready to pre-order?
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.
Bykski Durable 4x80mm 2U Server AIO Liquid CPU Cooler For AMD EPYC SP3 (LGA 4094) (B-FRDSRSP3-80-V3)
Inline pump 4 x 80 radiator, clears a 2U Sealed, filled, bled
Server CPU AIO · AMD EPYC SP3 LGA 4094

Sealed. Filled. Bled.

A complete liquid cooler for AMD EPYC SP3 LGA 4094, sealed at the factory. One copper block sits on the IHS; the 4 x 80 mm radiator carries the heat out the back of a 2U chassis with its own four fans. Fit the block, mount the radiator, plug in. No filling, no bleeding, no leak test.

IHS
One flat copper plate
Inline
Pump, nothing mounted
2U
Clears 88 mm of height
The 4 x 80 mm kit installed in a 2U chassis: two blocks on the sockets, the radiator and its four fans across the airflow path at the back
Warm air out the back of the chassis
Where the heat goes

Heat leaves through the radiator, not into the rest of the machine

A stock heatsink only moves the heat the chassis fans push through it. This kit takes the heat off the IHS into the coolant and out through a 4 x 80 mm radiator with its own four fans, straight out the back of a 2U, instead of soaking the memory and the drives beside the socket.

An 80 mm fan fits inside a 2U's 88 mm of internal height. A 120 mm fan does not. That is the whole reason this family exists.

Built for a socket that never gets a break. A AMD EPYC SP3 LGA 4094 at full load for hours is what this cooler is sized for.

The inline pump, exploded: housing, impeller and the two tubing connections
The part you cannot see in a photo

The pump is inline, not on the block

On most all-in-one coolers the pump is built into the block. On this kit it is inline, in the tubing between the block and the radiator, and nothing is mounted to the board. The round cap on the block is a logo, not a pump.

There is nothing to mount and nothing vibrating against the socket. Because the pump is not pressing against anything, it runs quieter than a pump built into a block, and the block stays a flat plate held at even pressure by the socket's own retention frame.

It is compact and powerful: a 40 mm can, 51 mm tall, moving 450 liters an hour, at 7000 RPM on a 4-pin PWM header.

Pump6 specs
TypeInline
Speed7000 RPM
Flow Rate450 L/h
Lift7 m
Control4-pin PWM
Dimensions40 mm diameter x 51 mm height
Everything on the loop, by the number

Radiator, fans, block

4 x 80 mm aluminum radiator, 11-channel core, face on
87.5 mm
Deep, with fans fitted
Four 80 mm fans on an 11-channel aluminum core, 355.61 mm long and 87.5 mm deep with the fans fitted. The 80 mm fan face is what stands inside a 2U's 88 mm of height; a 120 mm fan does not.
Radiator4 specs
MaterialAluminum
Length355.61 mm
Thickness with Fans87.5 mm
Channels11
80 mm PWM server fan, front view
3000 RPM
Four 80 mm PWM fans
Server-pattern 80 mm fans, four of them across the radiator, pushing front to back the way the chassis already moves air. They spin down when the socket is idle and ramp up only when it is working.
Fans5 specs
Sizing80 x 80 x 25 mm
Quantity4
Speed3000 RPM
Control4-pin PWM
BearingHydraulic
The CPU block on its tubing, numbered mounting screws at the corners
0.35 mm
Copper between IHS and coolant
A nickel-plated T2 copper plate sits on the IHS with a 0.35 mm section over the chip, held at even pressure by the socket's own retention frame. No backplate to fit and no thermal pads: paste on the IHS, four numbered screws, done.
Block2 specs
Dimensions115.40 x 76.00 x 27.00 mm
Structure0.3 mm micro-channels

About this part

This sealed server CPU AIO liquid cooler arrives pre-assembled, pre-filled, and pre-bled for AMD EPYC SP3 (LGA 4094) processors. The closed loop requires no filling, no bleeding, and no maintenance, providing liquid cooling directly to 2U rackmount server chassis.

High core count server processors generate sustained heat under continuous 24/7 loads. By moving thermal energy away from the CPU integrated heat spreader through a 4x80 mm radiator with dedicated PWM fans, exhaust heat discharges out of the chassis without soaking nearby memory modules or storage drives.

In the box
  • Bykski 4x80mm Server AIO Liquid CPU Cooler (radiator, inline pump, tubing, and CPU water block pre-assembled and pre-filled)
  • 4 x 80 mm PWM fans
  • AMD EPYC SP3 (LGA 4094) mounting kit
  • Thermal paste for the IHS
If the gallery shows a parts diagram, that diagram is the source of truth for what ships.
Datasheet
Technical specifications 8 specs
General
Baseplate MaterialT2 Copper
Baseplate Thickness0.35 mm
Surface TreatmentElectroless nickel plating
Plating Thickness0.001 - 0.002 mm
Tubing
Tubing MaterialBraided EPDM
Tubing Length410 mm
General
Socket CompatibilityAMD Socket SP3 (LGA 4094)
Warranty1 Year
Compatibility is decided by the socket, not the CPU model

Machined for AMD EPYC SP3 LGA 4094

Every CPU on this socket shares one mounting pattern, so the block fits the socket, not a model number. This kit ships with the mounting kit for AMD EPYC SP3 LGA 4094 and no other. Server and workstation sockets do not share patterns: if your board's socket is not the one on this page, it is not this kit. If you are not sure which socket you have, send us the board's model before you order.

ONLY Compatible with:

  • AMD EPYC 7001 / 7002 / 7003 Any EPYC 7xxx
The CPU block, top view, with its four numbered mounting screws
Dimension drawing of the 4 x 80 mm kit: radiator 355.61 mm long, 87.5 mm deep with the fans fitted
The second compatibility question

Measure before you order

Two things have to fit: the radiator with its fans, standing across the airflow path, and the block on the socket with the tubing reaching between them. Everything here is the same on every 2U kit we sell except the block, which is sized to the socket.

01Radiator, end to end355.61 mm
02Radiator depth with the fans fitted87.5 mm
03Internal height of a 2U opening, which the 80 mm fans clearabout 88 mm
04Pump, inline on the tubing40 x 51 mm
05Block for this socket, length x width115.40 x 76.00 mm
06Block height above the IHS27.00 mm
07Kit laid out straight, radiator to block (reference only)410 mm
Measure the chassis height and the airflow path. A 2U opening is about 88 mm, which an 80 mm fan clears and a 120 mm fan does not. The radiator needs 355.61 mm along the airflow path and 87.5 mm of depth with the fans fitted. The 410 mm figure is the kit stretched out straight, not a clearance you need: the hoses bend, and the pump tucks wherever there is room.
Not sure this is the one?

Sealed kit, or just the block

Same cold plate, two ways to buy it, and what happens if you keep the heatsink the board shipped with.

This kit
B-FRDSRSP3-80-V3
The bare block
CPU-SP3-SR
Stock cooling
As the board ships
You already haveA 2U chassis with room for the radiator across the airflow path. Nothing else.A working water-cooling loop: pump, radiator, reservoir, fittings, coolant.The CPU and the heatsink it came with: a passive fin stack that depends on the chassis fans to move any heat at all.
Day onePaste on the IHS, fit the block, mount the radiator, plug in. 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 tower, the socket depends on case airflow alone.
ServiceableSealed. Nothing to fill, bleed or top up.Every part, because it is your loop.Nothing to service, and nothing to improve: the heatsink can only move the heat the chassis pushes through it.
Best forServers and workstations that need it running this week.A build that already has water in it.The rack it was designed for, with the airflow it assumes. Not a tower, and not a rack running its fans slow for the noise.
Where to buy itThis page$103.99 · See the blockYou already own it.

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 cooler

Answers specific to B-FRDSRSP3-80-V3. If yours isn't here, ask — we'd rather talk you out of the wrong part than sell you one.

Do I have to build a loop?
No. It arrives sealed, filled and bled. Remove the stock heatsink, paste the IHS, fit the block, mount the radiator and plug in the fans and the pump. No filling, no bleeding, no leak test, and no coolant to buy.
What is in the box for the thermal interface?
Thermal paste for the IHS, and nothing else is needed: a CPU block has no memory or power stages to pad. The mounting kit for the socket on this page is in the box.
Will it fit my CPU?
Compatibility is decided by the socket, not the CPU model. Every CPU on AMD EPYC SP3 LGA 4094 shares one mounting pattern, and this kit ships the mounting kit for that socket and no other. Server and workstation sockets do not share patterns, so if your board has a different socket it is not this kit. Part number B-FRDSRSP3-80-V3.
Will the radiator fit my chassis?
This is the 2U kit. An 80 mm fan fits inside a 2U opening of about 88 mm and a 120 mm fan does not, which is why this family exists. The radiator needs 355.61 mm along the airflow path and 87.5 mm of depth with the fans fitted.
Why is the pump not on the block?
It is inline, in the tubing between the block and the radiator. Nothing is mounted to the board and nothing vibrates against the socket, so it runs quieter than a pump built into a block. The round cap on the block is a logo, not a pump. The loop is sealed, so the pump is not a part you service.
Can I cancel my pre-order?
Yes. A pre-order can be cancelled any time before it ships, for a full refund. Nothing is committed until it leaves Boise.
Is liquid always worth it?
No, and we will say so. A socket with rack airflow designed around it is fine on its heatsink. It changes when the machine runs at full load for hours, when the chassis runs its fans slow, or when the board is in a tower that was never designed to push air through a server heatsink.
Who handles the warranty?
BYKSKI.US, the exclusive US distributor, from Boise, Idaho. Claims are handled domestically rather than returned to an overseas factory.

Ask us before you order

Send your exact hardware model and we'll confirm the right part before you spend $349.99 — 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