Bykski CPU-3647-SR Durable All Metal CPU Water Block For LGA 3647 XEON - Continuous Usage - Rectangle
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Bykski CPU-3647-SR Durable All Metal CPU Water Block For LGA 3647 XEON - Continuous Usage

CPU-3647-SR-RCT Pre-order
$103.99USDFree shipping over $125

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.
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.

  • Socket: XEON LGA 3647
  • Fittings: G 1/4in. Thread
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?
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

> Socket: XEON LGA 3647 — 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.

Water cooling parts are designed for self-installation by qualified users. Damage caused by installation error isn't covered — if you're unsure at any step, ask before you power the loop.

About this part

The Bykski CPU-3647-SR XEON CPU Water Cooling Block showcases a robust all metal construction. For added durability and aesthetic charm, base section undergo an electroplating process, safeguarding against corrosion and oxidation.

The cooling block's microfin channels are ingeniously designed to be 0.3mm wide. This carefully chosen dimension allows for optimal flow rates, minimizing any restriction to the coolant's movement. Moreover, this feature enables remarkable heat dissipation capabilities, ensuring that your CPU stays cool even under heavy loads.

In the box
  • CPU Water Cooling Block
  • Installation Hardware, including thermal paste
If the gallery shows a parts diagram, that diagram is the source of truth for what ships.
Datasheet
ModelCPU-3647-SR
BrandBykski
MaterialElectroplated High Purity Copper / Brass Base
Channel0.3mm
Available SizesRectangle (108mm x 78mm x 16.3mm) and Square (90.91mm x 88mm x 16.3mm) versions.
SKUCPU-3647-SR-RCT

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 CPU-3647-SR-RCT. 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 > Socket: XEON LGA 3647. Bykski cut these to a specific hardware layout, so confirm the exact model rather than the family before ordering. Part number CPU-3647-SR-RCT.
Is it in stock, and when will it ship?
It is a normally stocked item currently on pre-order — we are between shipments. Orders dispatch from Boise, Idaho within 20 business days, and pre-orders are filled before any stock goes back on the website.
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.
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. Damage caused by installation error is not covered.
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 $103.99 — 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