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Choose radiator capacity around the heat your complete loop must reject and the space your case can actually provide; choose a pump for the resistance of that assembled loop, not its maximum advertised flow rate. Start with the exact GPU board and workload, then account for any CPU or additional GPUs, radiator and fan fit, noise goals, block compatibility, and the materials and fittings shared by every component. There is no universal radiator-size-per-watt rule or single pump that suits every workstation loop.
Start with the complete loop, not a radiator rule of thumb
A workstation GPU loop is a system: blocks transfer heat into coolant, a pump moves that coolant through the loop, and radiators with fans reject heat to the air. The radiator and pump therefore need to make sense together with the blocks, fittings, tubing, case, and workload. Choosing any one of them in isolation can lead to a loop that fits poorly or performs differently from what an advertised maximum suggests.
First define what will be cooled. Write down the exact GPU model and board, whether you plan to overclock it, and whether the CPU or any additional GPUs will also use the loop. Consider the sustained work the machine will do, not just a brief light-use scenario. A loop cooling several components has a different heat-rejection task from one cooling a single GPU.
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The available manufacturer material does not establish a universal radiator-area-to-watt formula. Radiator length by itself also does not promise a particular coolant temperature or noise level. Treat published sizing examples as examples for the named situation, then verify radiator fit, airflow, fan setup, and the rest of your system.
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Write down the design constraints
- Heat sources: list every GPU and any CPU in the loop, along with the intended workload and overclocking plans.
- Chassis space: check supported radiator positions and the physical room for radiator, fans, fittings, and tubing.
- Airflow and acoustics: decide what fan size, airflow, and noise level are acceptable for the workstation.
- Loop restrictions: account for the GPU block, any other blocks, radiators, fittings, and the route the tubing must take.
- Compatibility: verify the exact GPU board, materials, ports, fittings, and coolant requirements before purchasing.
Choose radiator capacity that fits the workload and chassis
Radiator selection has two linked tests: whether the available radiator and fan arrangement fits the case, and whether that arrangement is appropriate for the loop’s heat load and airflow goals. A larger GPU or an overclocking plan can change the choice; so can adding a CPU or another GPU. A physically large radiator is not a solution if the chassis cannot accommodate its thickness, fans, fittings, and tubing without obstructing the intended airflow.
Corsair gives a 360 mm-or-larger radiator as an example for an overclocked RTX 4090, and notes that recommendations vary with GPU model and overclocking. That is a scenario-specific example, not a minimum for every RTX 4090 system or a sizing rule for other GPUs. Corsair also says that adding a GPU can make an additional radiator worth considering, especially with RTX 4080/4090-class cards. These suggestions are useful prompts to evaluate added heat and available case space, not guarantees of a particular temperature or acoustic result. See Corsair’s radiator and GPU-block guidance.
Measure the mounting arrangement before selecting a radiator
Check the case’s radiator mounting positions and dimensions, then account for the full assembly rather than the radiator alone. Fans add depth, and fittings and tubing need room to connect and route. If considering push/pull, confirm that the extra fan row physically fits. Also consider whether the planned position supplies the airflow the fans need and whether other installed hardware blocks the mounting area.
Radiator models can differ in length, thickness, fin density, fan compatibility, and port arrangement. Those characteristics help determine fit and the conditions under which the radiator will operate, but the cited sources do not supply controlled comparisons normalized for noise. It would therefore be misleading to declare one format categorically quieter or better from those specifications alone.
Use workstation radiator specifications as fit information
The LM TEK/EK-Pro workstation catalogue lists EK-Pro P360 and P480 copper radiators. Both are specified as 45 mm thick, 18 FPI, compatible with 120 mm fans, and suitable for push/pull configurations. These are product-family specifications, not evidence that one has a particular cooling or noise advantage over the other. Confirm the dimensions and required clearances for the exact unit and case before treating either as a fit.
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| Catalogue item | Published details | What the details establish |
|---|---|---|
| EK-Pro P360 | Copper; 45 mm thick; 18 FPI; compatible with 120 mm fans; push/pull supported | Product-family fit and configuration information; no controlled performance or noise ranking is stated. |
| EK-Pro P480 | Copper; 45 mm thick; 18 FPI; compatible with 120 mm fans; push/pull supported | Product-family fit and configuration information; no controlled performance or noise ranking is stated. |
Specifications are listed in the LM TEK/EK-Pro liquid-cooling components catalogue. Compare the actual radiator dimensions with case clearances and the fan arrangement you intend to use; the model numbers alone do not establish that a radiator will fit a particular workstation.
Choose a pump for restriction in the assembled loop
A pump must circulate coolant through the complete route, including blocks, radiators, fittings, and tubing. The resistance of that route matters. A maximum discharge or free-flow number is not the flow you can assume after assembling a particular combination of parts. Consider the pump’s head or pressure capability, how it is controlled, its noise implications, and how its mounting and reservoir arrangement suit the case.
Published pump numbers are useful only with their context. Corsair’s Hydro X FAQ specifies 3.9 m of head pressure for its referenced pump/reservoir and says that unit is powerful enough for at least four water blocks and three radiators. This is the manufacturer’s statement about that product, not a universal D5 sizing standard. Thermaltake lists a 1135 L/h maximum discharge for the Pacific PR22-D5 Plus, which has a 300 ml reservoir and an integrated D5 pump. The discharge figure is a manufacturer maximum, not a promise of installed flow through your loop.
| Product reference | Published specification or claim | How to interpret it |
|---|---|---|
| Corsair referenced pump/reservoir | 3.9 m head pressure; manufacturer says it can support at least four blocks and three radiators | Manufacturer guidance for that specific unit; not a general pump sizing rule. |
| Thermaltake Pacific PR22-D5 Plus | 300 ml reservoir; integrated D5; five manual speed settings; 1135 L/h maximum discharge | The maximum discharge is a product specification, not expected flow in an installed loop. |
The published Corsair specifications are in its Hydro X custom-cooling FAQ; Thermaltake’s product details are on the Pacific PR22-D5 Plus page. Neither figure, on its own, predicts the flow or noise of your specific workstation build.
Prioritize the restrictions and control method
Before choosing among pumps, list the blocks and radiators in the intended loop and account for the fittings and routing they require. A loop with more components or restrictive parts should not be assessed as though it were an unrestricted outlet test. Compare pump head or pressure capability in the context of those restrictions, and consider whether the available control method can meet your operating and noise goals. The materials here do not provide a controlled, cross-brand pump ranking or a measured flow value for a particular workstation configuration.
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For a multi-block workstation or rack deployment, the LM TEK/EK-Pro catalogue lists PWM-controlled D5 pumps, standalone reservoirs, and pump-reservoir combinations. These options describe available component arrangements; they do not establish that one configuration is the best for every loop. Choose the arrangement that fits the case or rack, the planned service access, and the pump-control approach you need.
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A block must fit the exact graphics card or board, not merely share its GPU-family name. Professional and data-center cards can have different board layouts and form factors, including rack and full-height versions. A block that is appropriate for one card in a GPU family should not be assumed to fit another board with a similar name.
Check the block maker’s compatibility information against the exact card SKU and board layout. Confirm that the block covers the intended components, including memory and VRM areas, and that the block and card clear the chassis. Corsair advises choosing a block compatible with the GPU model; its configurator is one way to check products in its own lineup, not a substitute for checking another vendor’s block.
The LM TEK/EK-Pro workstation GPU-block catalogue lists separate professional and data-center variants, including models for RTX A6000, RTX 6000 Ada, H100, H200 NVL, and RTX PRO 6000 Blackwell. It also includes rack and full-height form factors in some cases. Those catalogue examples illustrate why the board and form factor matter; they do not establish cross-compatibility. Check the current entry for the exact card with the LM TEK/EK-Pro GPU water-block catalogue and the block maker’s specifications.
Match metals, ports, fittings, and coolant across the loop
Compatibility extends beyond whether a block mounts to the GPU. Every wetted component needs to suit the other materials and coolant in the loop, and the ports and fittings must match the parts they connect. Verify these details across the whole build rather than assuming that water-cooling components are interchangeable.
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Check materials across every wetted part
Corsair says not to mix its nickel-plated copper Hydro X blocks with aluminum components. Treat this as vendor guidance for its products and check the requirements of each component maker in your planned loop. Do not infer that a material combination is acceptable just because parts share the same general purpose or appear mechanically compatible. Corsair’s Hydro X FAQ describes its material guidance.
Verify port standards and fitting dimensions
The LM TEK/EK-Pro workstation catalogue identifies G1/4″ ports on workstation components and G1/8″ ports on some 1U rack parts. It also lists quick-disconnect kits and adapters for compatibility. These examples make it especially important to check the actual part: do not assume that a rack component uses the same port standard as a workstation part. Confirm the port standard and the tubing and fitting dimensions for every connection before ordering.
Follow the selected components’ coolant requirements
Corsair advises against using tap water to fill or flush its custom-cooling system. It says distilled water for long-term use needs corrosion, biological, and scale inhibitors, and recommends premixed coolant containing those inhibitors. That is manufacturer guidance for its own system; follow the coolant requirements for every selected component rather than treating one vendor’s recommendation as universal. See the Corsair Hydro X FAQ.
Interpret flow examples without turning them into a target
Flow affects the coolant temperature rise across a block, but an example reading is not a universal minimum-flow specification. Corsair reports that, in its example, coolant rose about 5°C across an RTX 4090 block at 60 L/h and about 2°C at 170 L/h. Those are vendor-reported example-system readings, not guaranteed results for another block, pump, radiator, or workload. They do not establish a target flow for all workstation GPU loops.
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Use the example to understand why flow can matter across a block, not to size a pump by selecting the higher number. Actual flow depends on the assembled loop, including its restrictions. Corsair’s explanation and example are on its page about whether loop order matters in water cooling.
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Route the loop for filling, bleeding, and service
Loop order should not override a sound, serviceable layout. Corsair says that with its pump/reservoir combination there is no need to worry about the order of the remaining parts. That guidance does not mean every layout is equally convenient: plan a sensible fill and bleed path, clean tubing runs, and access to the pump/reservoir in line with its maker’s instructions. Do not assume a radiator must always sit between the GPU and another block.
Before finalizing the route, check that fittings can be reached and tubing can be installed without interfering with the radiator, fans, or other hardware. The sources do not establish a mandatory order for every loop. Follow the instructions for the specific pump/reservoir and components you select.
A practical selection sequence
- Define the system boundary. Record the exact GPU board, the workload, overclocking plans, and whether the CPU or additional GPUs will share the loop.
- Verify the GPU block. Match the card SKU and board layout to the block, including memory and VRM coverage and chassis form factor. Do this before settling on the rest of the loop.
- Map radiator and fan space. Check mounting positions, radiator dimensions and thickness, fan size, fitting clearance, airflow, and whether push/pull fits. Consider whether an added heat source makes another radiator worth evaluating.
- Compare radiator options on fit and configuration. Use length, thickness, fan compatibility, fin density, and mounting arrangement as selection details; do not read a model number or a single dimension as proof of temperature or noise performance.
- List loop restrictions. Account for every block, radiator, fitting, and tubing route. Use that assembled path—not a pump’s maximum discharge figure alone—to judge pump suitability.
- Choose the pump and reservoir arrangement. Compare head or pressure capability, available control, mounting, service access, and noise goals in the context of the planned loop.
- Audit the connections and materials. Confirm the metals, port standards, fitting and tubing dimensions, adapters, and coolant requirements for all wetted parts.
- Plan routing and maintenance access. Leave a practical path for filling, bleeding, and servicing the pump/reservoir, and follow the component makers’ instructions.
Common selection mistakes to avoid
- Applying a universal radiator-per-watt formula: the cited material does not establish one. Evaluate the actual heat sources, workload, case fit, airflow, and noise goals.
- Treating a manufacturer example as a general requirement: a 360 mm-or-larger radiator example for an overclocked RTX 4090 is not a universal minimum for every GPU loop.
- Buying on maximum discharge alone: the PR22-D5 Plus maximum is not expected installed flow, and a free-flow figure does not account for your loop’s restrictions.
- Assuming GPU-family names guarantee block fit: verify the exact board, SKU, coverage, and form factor.
- Assuming all ports and metals match: confirm each part’s port standard and materials; workstation and some 1U rack components may differ.
- Turning an example flow reading into a minimum: Corsair’s temperature-rise readings describe its example system, not a universal pump target.
- Choosing a radiator from noise assumptions: the cited pages do not supply controlled noise-normalized comparisons, so compare the actual fan, airflow, fit, and acoustic requirements of your build.
How to compare two viable builds
If more than one radiator and pump combination fits, compare the complete configurations rather than isolated headline specifications. A useful side-by-side evaluation includes:
| Decision factor | What to compare | Why it matters |
|---|---|---|
| GPU and total heat load | Exact GPU board, workload, overclocking plans, CPU inclusion, and number of GPUs | Establishes what the loop is intended to cool. |
| Radiator and case fit | Radiator size and thickness, mounting locations, fan size, fittings clearance, and push/pull space | Prevents selecting a configuration that cannot be installed as intended. |
| Airflow and noise goals | Fan arrangement, airflow restrictions, and the workstation’s acoustic priorities | Radiator specifications alone do not establish a noise-normalized performance winner. |
| Pump suitability | Head or pressure capability, control method, mounting, and the restrictions of the complete loop | Maximum discharge does not predict installed flow through blocks and radiators. |
| GPU compatibility | Exact card SKU, board layout, memory and VRM coverage, and form factor | GPU-family naming alone does not establish block fit. |
| Materials and coolant | Wetted materials and each component maker’s coolant guidance | Prevents assuming that different parts can be combined without checking requirements. |
| Ports and serviceability | Port standards, tubing and fitting dimensions, adapters, and access for filling and maintenance | Identifies connection mismatches and makes the build easier to service. |
There is no controlled comparison in the cited material that ranks radiator formats or pump models across brands. The most defensible choice is the compatible configuration that fits your chassis and intended workload, while satisfying the loop’s restriction, airflow, noise, and service requirements.
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