6 Best Alternatives to the Alphacool NexXxoS ST20 HPE Full (2026)
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The Alphacool NexXxoS ST20 HPE Full Copper 120mm Radiator delivers high thermal conductivity through its pure copper construction. You might look for alphacool nexxxos st20 hpe full alternatives if you need a different thickness or port configuration. This original model excels in compact builds with its slim 0.79-inch profile. However, your case may require more depth or specific routing options.
We selected these alternatives because their specifications overlap with the original radiator. Each option shares the 120mm size and copper material but varies in height and port layout. Some offer thicker cores for greater heat dissipation capacity. Others provide more connection points for flexible tubing placement. This list helps you find a match for your specific chassis constraints. You can compare the physical dimensions and connectivity features to decide which fits your loop best. Each product listed here maintains the high-quality copper construction you expect from the brand.
Comparing ST20 Alternatives by Spec
Alphacool NexXxoS XT45 120mm Copper Radiator
The NexXxoS XT45 120mm Copper Radiator trades the ST20's slim 0.79-inch profile for a 1.81-inch thickness. This added depth provides a larger copper core for heat dissipation. You gain six G1/4-inch ports, offering significantly more routing flexibility than the ST20. The XT45 weighs 1.32 pounds, which is heavier than the ST20. This model suits builds with ample chassis depth where space is not the primary constraint. It delivers robust cooling performance for users who prioritize port variety and thermal mass over low-profile fitment.
Alphacool NexXxos UT60 120mm Copper Radiator
The NexXxoS UT60 120mm Copper Radiator features a substantial 2.76-inch height, nearly triple the thickness of the ST20. This design accommodates a 60mm copper core depth, maximizing surface area for heat exchange. You receive six G1/4-inch ports for complex loop routing. The unit weighs 1.76 pounds, reflecting its heavy-duty construction. This radiator is intended for cases with deep mounting locations. It is a superior choice when you need maximum thermal capacity and do not need to fit into tight spaces where the ST20 excels.
Alphacool NexXxos ST30 120mm Copper Radiator
The NexXxoS ST30 120mm Copper Radiator offers a 1.18-inch thickness, slightly thicker than the ST20's 0.79-inch profile. It retains full copper internal channels for high thermal conductivity. The ST30 includes dual G1/4-inch ports, providing basic connectivity compared to the ST20. Weighing 0.47 kilograms, it is lighter than the thicker alternatives. This model is ideal for standard single-fan mounts where a bit more depth is available. It balances weight and cooling performance for users who want a standard footprint without the extreme slimness of the ST20.
Alphacool NexXxos XT45 120mm X-Flow Radiator
The NexXxoS XT45 120mm X-Flow Radiator matches the XT45's 1.77-inch thickness but features a cross-flow design. This configuration directs coolant flow perpendicular to the fan, which can improve efficiency in certain layouts. You get six G1/4-inch ports for versatile tubing routing. The radiator weighs 1.15 pounds. It is best suited for single-fan systems requiring inline loop setups with enough case depth. If your build benefits from cross-flow dynamics and you have the space, this model offers a specialized alternative to the ST20's standard flow path.
Alphacool NexXxos ST30 X-Flow 120mm Radiator
The NexXxoS ST30 X-Flow 120mm Radiator combines a 1.18-inch thickness with a cross-flow internal design. It provides four port locations for routing flexibility. The unit weighs 12.4 ounces, making it lighter than the standard ST30. This model is designed for single-fan loops with cross-flow routing needs. It offers a middle ground between the slim ST20 and thicker radiators. If you require cross-flow efficiency but have limited depth, this radiator provides a compact solution with adequate port options for basic custom loop construction.
Alphacool NexXxoS ST25 Copper 120mm Radiator
The NexXxoS ST25 Copper 120mm Radiator presents a 1-inch profile, which is thicker than the ST20 but thinner than the ST30. It features a 15 FPI density for balanced airflow resistance. The ST25 includes dual G1/4-inch ports for standard connectivity. It weighs approximately the same as the ST30. This model is suitable for slim custom loops that need slightly more depth than the ST20 provides. It offers a straightforward low-profile solution for users who want copper construction without the extreme thinness of the HPE series or the bulk of standard radiators.
Quick picks
Our 7 picks
Alphacool NexXxoS ST20 HPE Full Copper 120mm Radiator
Best for: compact builds needing slim copper radiators
- Radiator Size
- 120mm
- Material
- Copper
- Thread Size
- G1/4"
View on Amazon: Alphacool NexXxoS ST20 HPE Full Copper 120mm Radiator Affiliate link
The Alphacool NexXxoS ST20 HPE Copper 120mm Radiator provides a compact liquid cooling solution with an ultra-slim 0.79-inch profile. Pure copper construction covers all water-carrying channels and cooling fins for efficient thermal transfer. It fits a single 120mm fan mount, making it ideal if you need a slim profile to clear tight internal clearances inside compact enclosures.
Pros
- Pure copper cooling fins and water-carrying channels
- Slim 0.79-inch thickness for restricted spaces
- Standard single 120mm form factor
- Black finish matches standard PC components
Cons
- Single 120mm size provides limited total surface area
- Slim profile holds less coolant volume than thicker radiators
Good fit if
- You need a low-profile 0.79-inch radiator for tight clearance areas.
- You want full copper channels and fins in a single 120mm mount.
Skip if
- You have chassis clearance for thicker 30mm, 45mm, or 60mm radiators.
- You require larger multi-fan cooling formats like 240mm or 360mm.
Verdict: Alphacool NexXxoS ST20 HPE Copper 120mm Radiator delivers pure copper thermal construction in an exceptionally slim 0.79-inch profile. It is the leading pick for tight enclosures where standard-thickness radiators will not fit.
Alphacool NexXxoS XT45 120mm Copper Radiator
Best for: compact custom loops needing versatile port options
- Radiator Size
- 120mm
- Material
- Copper
- Thread Size
- G1/4
- Fan Mount
- Single Fan
- Dimensions
- 4.88 × 6.18 × 1.81 inches
- Weight
- 1.32 pounds
View on Amazon: Alphacool NexXxoS XT45 120mm Copper Radiator Affiliate link
The Alphacool NexXxos XT45 120mm Radiator provides a thicker alternative to ultra-slim cooling hardware. It measures 46mm thick and features an all-copper core with copper channels, fins, and chambers. You get six G1/4-inch ports across its brass threads, giving you extensive routing options for your custom liquid loop. This unit suits you if your case accommodates a 120mm fan mount with extra depth for increased surface area.
Pros
- Six G1/4-inch ports for versatile connection angles
- Full copper core including fins, channels, and chambers
- 46mm thickness provides more surface area than slim models
Cons
- Requires 46mm of clearance, making it unsuitable for slim-only cases
- Weighs 784g before adding coolant
Good fit if
- You have at least 46mm of clearance at your 120mm mount.
- You want multiple G1/4-inch port options for easier tube routing.
Skip if
- You need an ultra-slim profile under 30mm thick.
- You need a multi-fan radiator format such as 240mm or 360mm.
Verdict: Alphacool NexXxos XT45 120mm Radiator delivers expanded routing versatility with six G1/4-inch ports and a 46mm copper core. It suits builds with enough depth to step up from slim radiators.
Alphacool NexXxos UT60 120mm Copper Radiator
Best for: custom loops with deep chassis clearance
- Radiator Size
- 120mm
- Material
- Copper
- Thread Size
- G1/4
- Fan Mount
- Single Fan
- Dimensions
- 4.72 × 4.72 × 2.76 inches
- Weight
- 1.76 pounds
View on Amazon: Alphacool NexXxos UT60 120mm Copper Radiator Affiliate link
The Alphacool NexXxos UT60 120mm Radiator is a 60mm thick custom loop heat exchanger built with copper channels, fins, and chambers. It features six G1/4-inch threaded ports and steel side panels, weighing 1,004 grams. If you need substantial cooling capacity in a single-fan 120mm footprint and your PC case has clearance for a deep frame, this unit suits your setup.
Pros
- Deep 60mm thickness provides high internal volume
- Six G1/4-inch ports offer flexible plumbing options
- Full copper core with brass threads and steel side panels
- Fits standard 120mm fan mounts
Cons
- 60mm depth requires substantial chassis clearance before adding fans
- Heavy build at 1,004 grams bare weight
Good fit if
- You have clearance for a 60mm thick single-fan radiator.
- You need versatile tube routing using six G1/4-inch ports.
- You want an all-copper flow path with brass threads.
Skip if
- You are building inside a compact case limited to slim radiators.
- You need a lightweight radiator under 1,000 grams.
Verdict: Alphacool NexXxos UT60 120mm Radiator provides 60mm of copper core depth and versatile six-port connectivity for installations with ample chassis space. It delivers a heavy-duty single-fan footprint where slim radiators lack sufficient volume.
Alphacool NexXxos ST30 120mm Copper Radiator
Best for: standard 120mm single-fan copper loop builds
- Radiator Size
- 120mm
- Material
- Copper, brass, stainless steel
- Thread Size
- G1/4
- Fan Mount
- Single Fan
- Dimensions
- 6.18 × 4.88 × 1.18 inches
- Weight
- 0.47 kilograms
View on Amazon: Alphacool NexXxos ST30 120mm Copper Radiator Affiliate link
This 120mm single-fan radiator delivers standard-thickness liquid cooling in compact builds. You get a 30mm profile, measuring 157mm long and 124mm wide, paired with an all-copper core featuring copper fins, channels, and chambers. Two G1/4-inch brass ports handle inlet and outlet tubing connections. At 469 grams, it suits you if your chassis supports a standard 120mm fan mount and you want full-copper fluid channels without extra chamber depth.
Pros
- Copper construction across cooling fins, channels, and chambers
- Slim 30mm profile fits standard 120mm fan locations
- Standard brass G1/4-inch threaded ports
- Lightweight 469g build with protective steel side panels
Cons
- Only two G1/4-inch ports limit routing options
- Single 120mm fan size limits total heat dissipation area
Good fit if
- You need a 30mm thickness radiator for single 120mm mounts.
- You want copper channels, fins, and chambers in your loop.
Skip if
- You need multi-port options beyond standard inlet and outlet ports.
- You require a thinner profile than 30mm for ultra-compact spacing.
Verdict: Alphacool NexXxos ST30 120mm Copper Radiator provides full copper internal channels and a 30mm thickness for standard single-fan mounts. It balances a 469g weight with dual G1/4-inch ports for basic loop routing.
Alphacool NexXxos XT45 120mm X-Flow Radiator
Best for: single-fan systems requiring cross-flow loop routing
- Radiator Size
- 120mm
- Material
- Copper
- Thread Size
- G1/4
- Dimensions
- 4.88 × 6.77 × 1.77 inches
- Weight
- 1.15 pounds
View on Amazon: Alphacool NexXxos XT45 120mm X-Flow Radiator Affiliate link
The Alphacool NexXxoS XT45 120mm X-Flow Radiator gives you a single-fan cooling option with an inline cross-flow layout. It features a 45mm thickness, copper channels, copper fins, and copper chambers. With six G1/4-inch threaded ports, it provides flexible routing points across opposite ends of the core. If you need thicker cooling capacity than slim models and prefer cross-flow port positioning, this steel-paneled radiator fits your loop.
Pros
- Six G1/4-inch threaded connection ports
- Full copper channels, fins, and chambers
- 45mm thickness provides greater depth than slim models
- X-Flow design enables direct inlet and outlet routing at opposite ends
Cons
- 172mm overall length requires more clearance than standard 120mm dual-pass radiators
- 45mm profile is too thick for ultra-compact or slim-only chassis mounts
Good fit if
- You want an inline cross-flow layout with ports on opposite ends
- You have space to accommodate a 45mm thick 120mm radiator core
- You need multiple G1/4-inch port options for fill, drain, or tube runs
Skip if
- You need a slim 20mm to 30mm profile for a tight clearance mounting area
- You have insufficient chassis length to fit a 172mm extended frame
Verdict: Alphacool NexXxoS XT45 120mm X-Flow Radiator delivers a 45mm thick copper core paired with six ports for streamlined inline loop setups. It is a solid choice when your case has enough depth and length to support an extended cross-flow layout.
Alphacool NexXxos ST30 X-Flow 120mm Radiator
Best for: cross-flow routing in single-fan loops
- Radiator Size
- 120mm
- Material
- Copper
- Thread Size
- G1/4
- Dimensions
- 4.88 × 6.77 × 1.18 inches
- Weight
- 12.4 ounces
View on Amazon: Alphacool NexXxos ST30 X-Flow 120mm Radiator Affiliate link
The Alphacool NexXxos ST30 X-Flow 120mm Radiator is a single-fan copper radiator with a 30mm thickness. It features an end-to-end X-Flow coolant path, four G1/4-inch threaded ports, and an overall length of 172mm. Copper fins, channels, and chambers manage heat transfer, while steel side panels add structure. You will find it fits custom loop builds needing flexible routing across opposite ends of a compact 120mm mount.
Pros
- Four G1/4" threaded ports
- Copper cooling fins, channels, and chambers
- Slim 30mm thickness
- Lightweight at 352 grams
Cons
- Long 172mm body exceeds standard 120mm fan dimensions
- Supports only a single 120mm fan
Good fit if
- You need an X-Flow configuration with four G1/4" ports.
- You want copper internals in a slim 30mm profile.
- You have 172mm of total length clearance in your mount.
Skip if
- You need a larger multi-fan radiator format.
- You do not have space for the extended 172mm housing.
Verdict: Alphacool NexXxos ST30 X-Flow 120mm Radiator provides an inline flow design with all-copper internals and a 30mm thickness. Its four port locations give you versatile routing choices for single-fan cooling locations.
Alphacool NexXxoS ST25 Copper 120mm Radiator
Best for: slim custom loops needing low-profile copper radiators
- Radiator Size
- 120mm
- Material
- Copper
- Thread Size
- G1/4
- Dimensions
- 3.15 × 3.15 × 3.94 inches
View on Amazon: Alphacool NexXxoS ST25 Copper 120mm Radiator Affiliate link
This is a 120mm single-fan radiator built with full copper construction for custom liquid cooling loops. It measures 151 x 120 x 25.5 mm, giving you a slim profile with a moderate fin density of 15 fins per inch. The unit includes two standard G1/4-inch ports for basic loop routing. It suits you if you need a compact radiator that fits tight chassis clearances.
Pros
- Solid copper construction
- Slim 25.5 mm profile
- 15 fins per inch density
- Standard dual G1/4" ports
Cons
- Only two G1/4" connection ports
- Limited heat dissipation of a single 120mm fan size
Good fit if
- You need a slim 25.5 mm radiator for compact spaces.
- You want full copper construction with 15 fins per inch.
Skip if
- You need extra port locations for flexible tube routing.
- You require larger multi-fan cooling surface area.
Verdict: Alphacool NexXxoS ST25 Full Copper 120mm provides a compact 25.5 mm profile and copper build for space-constrained cooling loops. Its 15 FPI density and dual G1/4" ports deliver a straightforward, low-profile solution.
Specifications side by side
| Spec | Alphacool NexXxoS ST20 HPE Full Copper 120mm Radiator | Alphacool NexXxoS XT45 120mm Copper Radiator | Alphacool NexXxos UT60 120mm Copper Radiator | Alphacool NexXxos ST30 120mm Copper Radiator | Alphacool NexXxos XT45 120mm X-Flow Radiator | Alphacool NexXxos ST30 X-Flow 120mm Radiator | Alphacool NexXxoS ST25 Copper 120mm Radiator |
|---|---|---|---|---|---|---|---|
| Radiator Size | 120mm | 120mm | 120mm | 120mm | 120mm | 120mm | 120mm |
| Material | Copper | Copper | Copper | Copper, brass, stainless steel | Copper | Copper | Copper |
| Thread Size | G1/4" | G1/4 | G1/4 | G1/4 | G1/4 | G1/4 | G1/4 |
| Fan Mount | not stated | Single Fan | Single Fan | Single Fan | not stated | not stated | not stated |
| Size | 120Mm | 120Mm | 120Mm | 120Mm | 120Mm | 120Mm | 120Mm |
| Dimensions | not stated | 4.88 × 6.18 × 1.81 inches | 4.72 × 4.72 × 2.76 inches | 6.18 × 4.88 × 1.18 inches | 4.88 × 6.77 × 1.77 inches | 4.88 × 6.77 × 1.18 inches | 3.15 × 3.15 × 3.94 inches |
| Weight | not stated | 1.32 pounds | 1.76 pounds | 0.47 kilograms | 1.15 pounds | 12.4 ounces | not stated |
| Color | Black | Black | Black | Black | Black | Black | Black |
| Model | 14435 | 14163 | 14172 | 14156 | 14232 | 1011656 | 14352 |
If you need compact equipment for a different space, you can review avanti full compact kitchen alternatives.
Frequently asked questions
Which Alphacool radiator is best for tight cases?
The NexXxoS ST20 HPE Full Copper 120mm Radiator is the top choice for compact builds. It features an exceptionally slim 0.79-inch profile. This thin design allows it to fit into enclosures where standard-thickness radiators will not fit. You get pure copper thermal construction in this small footprint.
How many ports does the NexXxoS XT45 have?
The NexXxoS XT45 120mm Copper Radiator includes six G1/4-inch ports. This configuration offers expanded routing versatility for your custom loop. It suits builds with enough depth to step up from slim radiators. You can connect multiple tubes easily for complex plumbing setups.
What is the thickness of the NexXxoS ST30?
The NexXxoS ST30 120mm Copper Radiator has a 30mm thickness. It provides full copper internal channels for standard single-fan mounts. This model balances a 469g weight with dual G1/4-inch ports. It is suitable for basic loop routing in standard cases.
Is there a 60mm deep copper radiator available?
Yes, the NexXxoS UT60 120mm Copper Radiator provides 60mm of copper core depth. It offers versatile six-port connectivity for installations with ample chassis space. This heavy-duty single-fan footprint is ideal where slim radiators lack sufficient volume for heat dissipation.
Which model supports cross-flow routing?
The NexXxoS XT45 120mm X-Flow Radiator delivers a 45mm thick copper core paired with six ports. It is designed for streamlined inline loop setups. This model is a solid choice when your case has enough depth and length to support an extended cross-flow layout.
Does the ST30 X-Flow have multiple port options?
The NexXxoS ST30 X-Flow 120mm Radiator provides four port locations. These locations give you versatile routing choices for single-fan cooling spots. It features an inline flow design with all-copper internals and a 30mm thickness for efficient heat transfer.
What is the thinnest copper radiator listed?
The NexXxoS ST25 Copper 120mm Radiator offers a compact 25.5 mm profile. It provides a copper build for space-constrained cooling loops. With 15 FPI density and dual G1/4-inch ports, it delivers a straightforward, low-profile solution for tight spaces.
Which radiator is best for deep chassis clearance?
The NexXxoS UT60 120mm Copper Radiator is best for custom loops with deep chassis clearance. It provides 60mm of copper core depth. This extra volume ensures effective cooling in cases where space is not a constraint, unlike the slim ST20 or ST25 models.