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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallChoose a radiator and pump for the heat your actual loop must carry and the restrictions of the parts you will install—not from a universal “millimeters per watt” rule. Start by confirming the exact GPU and block, listing every heat-producing component in the loop, and checking what radiator and fan arrangement fits your chassis. Then select a pump for the assembled loop’s resistance, not simply its advertised maximum flow.
Start with the loop you are actually building
A radiator releases heat from the coolant; a pump circulates coolant through the blocks, radiator, tubing, and fittings. Neither component can be sized responsibly in isolation. A single GPU loop and a loop serving several GPUs plus a CPU have different heat loads and restrictions, while a workstation tower and a 1U rack system impose different space and fitting constraints.
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Before choosing parts, write down the system boundary: which devices will be water-cooled, which GPU boards you have, the sustained work you expect them to do, and whether you plan to overclock. Include every GPU in a multi-GPU system and include the CPU if it shares the loop. The available manufacturer guidance does not establish a universal radiator-area-to-watt formula, nor does it promise a particular coolant temperature or noise level from a radiator length alone.
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Make a parts-and-constraints worksheet
- Heat sources: exact GPU model and board, number of GPUs, CPU inclusion, workload, and overclocking plans.
- Physical envelope: chassis mounting positions, radiator length and thickness clearance, fan dimensions, fittings clearance, and room for push/pull fans if you want that arrangement.
- Loop restrictions: the blocks, radiators, fittings, tubing route, and any other components coolant must pass through.
- Operating priorities: acceptable fan and pump noise, airflow, control method, service access, and ease of filling and bleeding.
- Compatibility: exact GPU-block match, wetted-part materials, port standards, tubing and fitting dimensions, and coolant requirements.
This worksheet prevents a common mismatch: buying a radiator that does not fit once fans and fittings are installed, or selecting a pump from a free-flow number without accounting for the resistance of the assembled loop. It also makes comparisons fairer. Compare candidate radiators or pumps against the same GPU count, workload, chassis, and noise priorities; otherwise a published number from one product may not describe the same conditions as another.
How much radiator capacity do you need?
Use the GPU, total loop heat load, overclocking plans, and chassis capacity together. Corsair says radiator recommendations vary by GPU model and overclocking, and notes that adding a GPU can make an additional radiator worth considering, particularly for RTX 4080- and RTX 4090-class cards. As one scenario-specific example, Corsair suggests a 360 mm-or-larger radiator for an overclocked RTX 4090. That is an example, not a rule for every RTX 4090 loop or a sizing formula for other GPUs. See Corsair’s radiator and GPU-block guidance.
After accounting for heat load, confirm that the chassis can take the radiator, fans, and fittings together and still provide the airflow the chosen arrangement needs. A radiator’s stated length is only one part of fit: thickness, fan configuration, nearby components, and the space needed to connect ports matter too. If the case supports multiple radiator positions, consider those as part of the loop layout rather than assuming a single location or radiator will meet every target.
Check the whole installation envelope rather than just the nominal radiator measurement. For a 45 mm-thick unit, the fans add further thickness; push/pull uses fans on both sides and therefore needs room for that arrangement. The ports and fittings also need access, and nearby components must not block the intended airflow or connections. Confirm the case’s actual mounting and clearance dimensions against the radiator and fan dimensions before ordering. A radiator that fits a mount on paper may still conflict with a GPU, motherboard, or other hardware once assembled.
Workstation radiator examples
The LM TEK/EK-Pro workstation catalogue lists P360 and P480 copper-fin radiators. Both are specified as 45 mm thick, 18 FPI, compatible with 120 mm fans, and suitable for push/pull configurations. These are catalogue specifications, not comparative test results establishing that one model cools more effectively or runs quieter. Check the product and chassis dimensions for the exact installation before buying. The catalogue is at LM TEK/EK-Pro liquid-cooling components.
| Radiator option | Catalogue specifications | What to verify for your build |
|---|---|---|
| EK-Pro P360 | Copper-fin; 45 mm thick; 18 FPI; 120 mm fans; push/pull compatible, according to the LM TEK/EK-Pro catalogue. | Chassis mounting space, total thickness with fans, fitting access, airflow path, and whether the total loop heat load and noise goals suit the planned arrangement. |
| EK-Pro P480 | Copper-fin; 45 mm thick; 18 FPI; 120 mm fans; push/pull compatible, according to the LM TEK/EK-Pro catalogue. | Chassis mounting space, total thickness with fans, fitting access, airflow path, and whether the total loop heat load and noise goals suit the planned arrangement. |
Do not read the model names as proof that a particular size will deliver a specific coolant temperature or acoustic result. The cited material does not provide controlled noise-normalized comparisons across these radiator formats. Fan size and speed, airflow restrictions, fin density, case ventilation, and the intended noise level all belong in the decision; the sources do not establish one format as categorically quieter or better.
In practice, there are two separate questions: what radiator configuration can physically fit, and whether that configuration is appropriate for the heat load and operating priorities. A larger or additional radiator may be worth considering when adding a GPU, but it is still necessary to account for fans and available mounts. The cited guidance does not promise that any one configuration will produce a particular temperature or noise level, so treat vendor recommendations as candidate starting points tied to their stated systems.
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Choose a pump for loop resistance, not a headline flow number
A pump’s job is to move coolant through the complete loop. Blocks, radiators, fittings, tubing, and the route all contribute to the system the pump must serve. Head pressure and control capability therefore matter alongside the physical pump-and-reservoir arrangement and noise goals. A maximum discharge or free-flow figure does not tell you the flow the pump will deliver through your particular set of parts.
Two manufacturer examples illustrate why figures need their context. Corsair’s Hydro X FAQ specifies 3.9 m head pressure for one pump/reservoir unit and says that unit can handle at least four water blocks and three radiators. That is a statement about that referenced product, not a universal rule for pumps of a particular type. Thermaltake lists its Pacific PR22-D5 Plus as a 300 ml reservoir with an integrated D5 pump, five manual speed settings, and maximum discharge of 1135 L/h. The 1135 L/h value is the manufacturer’s maximum specification, not an expected installed-loop flow rate. Compare the figures as product descriptions, not as a cross-brand performance ranking.
| Product example | Published figure or feature | How to interpret it |
|---|---|---|
| Corsair pump/reservoir unit | 3.9 m head pressure; manufacturer says it supports at least four blocks and three radiators. | Product-specific head-pressure and capacity claims. Confirm the exact unit and assess the restrictions in your assembled loop. |
| Thermaltake Pacific PR22-D5 Plus | 300 ml reservoir; integrated D5; five manual speed settings; 1135 L/h maximum discharge. | The discharge value is a manufacturer maximum, not a prediction of flow once the loop is assembled. |
See Corsair’s Hydro X FAQ and the Thermaltake PR22-D5 Plus product page for those product-specific details. The LM TEK/EK-Pro catalogue also lists PWM-controlled D5 pumps, standalone reservoirs, and pump-reservoir combinations for multi-block workstation and rack deployments. Choose among these types by checking control, mounting, reservoir layout, serviceability, and the restrictions of the complete loop—not by treating a product’s maximum discharge as a sizing guarantee.
When comparing a pump, distinguish its published maximum discharge from its ability to push coolant through a restrictive assembled loop. Ask what pump control is available and whether it suits your desired operation; the listed workstation options include PWM-controlled D5 pumps, while the Thermaltake example has five manual speed settings. Consider whether you want a standalone reservoir, an integrated pump/reservoir unit, or a separate pump and reservoir based on the chassis, mounting options, and service access. The catalogue and product specifications identify options, but do not provide a controlled cross-brand test or a universal pump choice.
For a multi-block or rack build, count the actual blocks and radiators and include fittings and routing in the loop plan. Corsair’s “at least four blocks and three radiators” statement describes its referenced pump/reservoir unit; it should not be generalized into a capacity rule for other pumps. Likewise, a high maximum discharge does not erase loop resistance. Use the product’s pressure and control specifications as part of the selection, then check that the pump arrangement is compatible with the specific parts you have chosen.
Use flow examples as context, not a target
Corsair reports an example coolant temperature rise of about 5°C across an RTX 4090 block at 60 L/h and about 2°C at 170 L/h. Those are readings in Corsair’s example system, not guaranteed results in another loop and not universal minimum-flow requirements. They show that flow can affect temperature rise across a block; they do not establish a single flow target for every GPU or workload. The example appears in Corsair’s explanation of loop order.
Do not use either example rate as a pass/fail threshold for a workstation loop. The measurements apply to the cited RTX 4090 block example, and the source does not establish that another GPU, block, workload, or restriction profile will produce the same temperature rise. The useful takeaway is limited: flow affects the temperature change across a block, while installed flow depends on the complete loop. Choose and evaluate the pump in that context rather than aiming at a number detached from the actual system.
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Verify the exact GPU block before ordering other parts
A water block must fit the specific graphics card, not merely share its GPU-family name. Board layouts and form factors differ, and a workstation or rack card may need a different block from a superficially similar professional GPU. Before purchase, confirm the exact card SKU and PCB or board layout against the block maker’s compatibility information, including memory and VRM coverage and chassis clearance.
Corsair advises choosing a block that is compatible with the GPU model; its configurator is one route for checking products in its own lineup. The LM TEK/EK-Pro catalogue shows why chip naming alone is insufficient: it lists distinct professional and data-center variants, including RTX A6000, RTX 6000 Ada, H100, H200 NVL, and RTX PRO 6000 Blackwell blocks, with rack and full-height form factors for some models. Treat those as distinct compatibility options, not interchangeable blocks. Check the maker’s exact listing in the LM TEK/EK-Pro GPU water-block catalogue.
- Record the full GPU product name and board SKU, including its manufacturer and form factor.
- Find a block listing that explicitly covers that board or card variant; do not infer fit from the GPU chip name alone.
- Confirm the block covers the components intended by its maker and clears the card, chassis, and neighboring parts.
- Only after confirming the block, finalize radiator, pump, fittings, and routing around the actual block’s ports and restrictions.
This order of operations avoids building a loop plan around a block that does not fit the card. If the GPU is a professional or data-center part, check whether the catalogue entry is for a rack or full-height form factor and whether it matches the actual board. A block’s advertised GPU-family association is not enough to establish PCB compatibility, memory or VRM coverage, or physical clearance.
Check metals, ports, fittings, and coolant across the whole loop
Compatibility does not stop at the GPU block. Check every wetted component—including blocks, radiators, fittings, and pump or reservoir parts—for material and coolant requirements. Corsair says not to combine its nickel-plated copper Hydro X blocks with aluminum components. That is manufacturer guidance for those parts; do not assume materials are safe to mix just because the fittings connect. Review the requirements of every selected component maker.
Port standards can also change between workstation and rack parts. LM TEK/EK-Pro lists G1/4″ ports on workstation components and G1/8″ on some 1U rack components, along with QDC kits and adapters for compatibility. Verify the actual port standard on each component, then match fittings to both the port and tubing dimensions. Do not assume that a part from the same broad product category uses the same port as another.
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For a loop mixing tower and rack-oriented parts, check each component individually instead of assuming a single interface standard. The catalogue’s G1/8″ specification applies to some 1U rack components, not all workstation parts; its listed QDC kits and adapters are possible compatibility options, not a reason to skip checking the actual part. Confirm port thread and tubing/fitting dimensions before buying, and consider whether the chosen connections remain accessible for service once the loop is installed.
Coolant selection is part of that compatibility check. Corsair advises against tap water for filling or flushing its custom system. For long-term use of distilled water, its guidance calls for corrosion, biological, and scale inhibitors; it recommends premixed coolant containing those inhibitors. This is Corsair’s system guidance rather than a substitute for instructions from the makers of all the parts in your loop. Consult each component’s requirements before filling or flushing. The details are in the Hydro X FAQ.
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Corsair’s exact warning is: “You should never fill or flush your custom cooling system with tap water since tap water contains high levels of particulates and minerals that will damage and clog your system.” Treat that as Corsair’s guidance for its system, and follow the selected component makers’ requirements for coolant and flushing. Material compatibility and coolant choice belong in the parts-selection stage, not as an afterthought once the loop is assembled.
Plan a practical loop layout without treating order as a cooling rule
Route the loop for a sensible fill and bleed path, clean tubing runs, and the instructions for the pump and reservoir you select. Do not assume that a radiator must always sit between the GPU and another block. Corsair says that, with its pump/reservoir combination, there is no need to worry about the order of the remaining parts. Apply that statement within its product guidance; use your chosen components’ instructions when planning the actual layout.
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In a multi-block workstation loop, a layout that is straightforward to connect and service may be more useful than a rigid sequence based on an assumed universal rule. Confirm port locations, tubing and fitting compatibility, case clearances, and access for filling before committing to a route. The available manufacturer guidance does not establish a universal loop order that guarantees a particular temperature.
Make sure the pump/reservoir can be mounted in a usable position and that the planned route leaves room to fill and bleed the system. These are practical layout checks, not a claim that a particular sequence of blocks and radiators is required for cooling. Follow the selected pump/reservoir maker’s instructions and check the final tubing route against the chassis, fittings, and service needs of the workstation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A selection sequence for a workstation build
- Define the heat load. List each GPU and whether the CPU is included. Record the expected sustained workload and overclocking plans so radiator decisions reflect the intended use.
- Lock down the block. Match the exact card SKU and form factor to an explicitly compatible GPU block before using the GPU family name as a purchasing shortcut.
- Map the chassis. Check radiator mounting positions and clearance for the radiator, fans, fittings, and any push/pull arrangement. Account for airflow and access, not just nominal radiator length.
- Set radiator candidates. Compare the capacity that physically fits against the total loop heat load and noise priorities. Treat vendor sizing recommendations as examples tied to their stated scenarios.
- Choose the pump and reservoir arrangement. Consider head pressure, control method, mounting, serviceability, noise goals, and the resistance of all blocks, radiators, and fittings. Do not equate maximum discharge with installed flow.
- Audit the interfaces. Confirm metals, port standards, fitting and tubing dimensions, and manufacturer coolant requirements for every part that will contact coolant.
- Route and validate the loop. Plan accessible filling and bleeding, check the component makers’ instructions, and verify that connections and clearances work with the final arrangement.
What the published specifications can—and cannot—tell you
The cited pages provide manufacturer examples, specifications, and compatibility catalogues rather than controlled head-to-head tests. They are useful for identifying candidate parts and checking requirements, but they do not establish one best radiator or pump, a universal radiator length per watt, a guaranteed installed flow rate, or a noise-normalized ranking. In particular, the Corsair RTX 4090 radiator recommendation applies to the stated overclocked-GPU example; the pump capacity and temperature-rise figures apply to their respective examples; and the Thermaltake discharge number is a maximum specification.
When two options physically fit, compare them against the same build facts: total heat load, radiator dimensions and fan fit, airflow and noise priorities, pump capability at the loop’s restrictions, exact GPU-board compatibility, materials, coolant requirements, ports, and ease of service. The right choice is the one that satisfies those constraints together, not the one with the largest isolated number.
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Frequently Asked Questions
What size radiator and pump do I need for a workstation GPU water-cooling loop?
There is no universal size or pump specification supported for every build. List all GPUs and any CPU sharing the loop, note workload and overclocking plans, then check radiator and fan fit in the chassis. Choose a pump for the restrictions of the assembled loop, using head pressure and control details rather than maximum discharge alone.
Is a 360 mm radiator enough for an RTX 4090?
Corsair gives a 360 mm-or-larger radiator as an example for an overclocked RTX 4090, but it is scenario-specific rather than a rule for every RTX 4090 loop. Total heat load, overclocking, chassis fit, fans, airflow, and noise goals still matter.
Does a pump rated for 1135 L/h deliver that flow in my loop?
No such installed-flow conclusion follows from that specification. Thermaltake lists 1135 L/h as the PR22-D5 Plus maximum discharge; blocks, radiators, tubing, fittings, and routing add resistance. Treat the figure as a product maximum, not expected flow through a particular workstation loop.
Can I use any water block listed for the same GPU family?
No. Verify the exact card SKU, PCB or board layout, form factor, intended memory and VRM coverage, and chassis clearance with the block maker. Professional and rack GPU variants can have distinct blocks even when their GPU-family names appear similar.
Can I mix aluminum and copper or nickel-plated copper parts?
Check material requirements across every wetted component. Corsair says not to mix its nickel-plated copper Hydro X blocks with aluminum parts; follow the selected component makers’ compatibility and coolant instructions rather than assuming connected fittings make materials compatible.
Does loop order matter, and should a radiator always go between the GPU and CPU?
Corsair says that with its pump/reservoir combination there is no need to worry about the order of the remaining parts. Plan a sensible fill and bleed path, clean tubing runs, and follow the instructions for your selected components; the cited guidance does not establish a universal order that guarantees a particular temperature.
The Bottom Line
Choose radiator capacity around the complete loop’s heat load and what the chassis can fit, and choose a pump for the resistance of the actual blocks, radiators, fittings, and routing. Confirm the exact GPU block first, then check fan and radiator clearance, pump control and head-pressure context, materials, ports, and coolant requirements. Treat vendor numbers as product-specific examples—not universal sizing rules or guarantees of installed temperature, flow, or noise.
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