6 Best Alternatives to the LXun 310W Lenovo TFX Power (2026)
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The LXun upgraded pcj007 310w power alternatives list helps you find a suitable replacement for your Lenovo TFX desktop. This original unit offers 310W of power in a compact 5.9×3.2×2.6 inch form factor. It features a 10-pin motherboard connector and supports modest GPU upgrades with its dual 6+2 pin PCIe outputs. The design includes temperature-controlled fan operation for quieter performance during light loads.
You might seek alternatives if you need higher efficiency, different modularity, or simply a different brand. The products in this guide were chosen because their specifications overlap with the original LXun unit. Some options remain in the TFX form factor for direct swaps, while others offer ATX layouts for different build types. Each entry is evaluated based on its published wattage, connector types, and physical dimensions. This approach ensures you can compare features like efficiency ratings and cable configurations without guessing. Use this data to select the power supply that best matches your system requirements and upgrade goals.
Our top pick: LXun 310W Lenovo TFX Power Supply.
How alternatives compare to LXun
SilverStone 300W Bronze TFX Power Supply
The SilverStone TX300-VT offers 300W of power in a TFX form factor, making it a direct physical replacement for your Lenovo system. It differs from the LXun unit by carrying an 80 Plus Bronze efficiency rating, which typically reduces wasted energy and heat. While the LXun provides 310W, the SilverStone is slightly wider at 3.4 inches compared to 3.2 inches, so you must verify case clearance. It features fixed cables, which simplifies installation but offers less flexibility than modular designs. This unit suits users who prioritize efficiency and brand reliability over the extra 10W provided by the LXun.
Corsair RM850x Shift 850W White ATX Power Supply
The Corsair RM850x Shift is an ATX power supply, not a TFX unit, so it will not fit inside your Lenovo desktop chassis. It provides 850W of power, far exceeding the 310W output of the LXun. This unit is designed for standard ATX cases with side-mounted modular connectors. It supports ATX 3.1 and PCIe 5.1 standards, making it suitable for modern high-performance builds. If you are building a new desktop rather than replacing a failed OEM part, this is a strong choice. It is completely incompatible with the small form factor requirements of your current Lenovo system.
Corsair RM850x 850W Fully Modular ATX 3.1 PSU
The Corsair RM850x is another ATX power supply that does not fit TFX chassis. It delivers 850W of power with full modularity, allowing you to connect only the cables you need. It supports ATX 3.1 and includes a 12V-2x6 connector for modern graphics cards. The LXun is a 310W TFX unit designed for specific Lenovo OEM replacements. This Corsair model is intended for larger desktop cases. It offers significantly more power and cable management options but requires a completely different case type. It is not a viable replacement for your existing Lenovo hardware.
Corsair RM750x Shift White 750W ATX Power Supply
The Corsair RM750x Shift is an ATX power supply with 750W of output. It features side-mounted modular connectors and supports ATX 3.1 standards. This unit is designed for standard ATX cases and is physically incompatible with the TFX form factor of your Lenovo desktop. It provides much higher power than the 310W LXun unit. The modular design allows for cleaner cable management in larger builds. If you are upgrading to a new standard desktop case, this is a capable option. It cannot be used as a direct replacement for the small TFX power supply in your current system.
Corsair RM1000e 1000W ATX Power Supply
The Corsair RM1000e is a high-capacity ATX power supply providing 1000W of power. It is fully modular and designed for standard ATX cases. This unit is far too large and powerful for a Lenovo TFX desktop. It lacks the physical dimensions and connector layout required for OEM replacements. The LXun 310W unit is specifically sized to fit compact Lenovo systems. This Corsair model suits users building high-end gaming or workstations in full-size cases. It offers excellent power for multiple high-end components but is completely unsuitable for your current small form factor machine.
BackPlanePro 300W TFX Power Supply
The BackPlanePro 300W TFX is a compact power supply similar in form factor to the LXun unit. It provides 300W of power, slightly less than the 310W output of the LXun. This unit is noted as a suitable replacement for Dell Inspiron slimline desktops rather than Lenovo systems. It features an active PFC design and a silent 80mm fan. The physical dimensions differ slightly, with a width of 2.56 inches and a height of 3.35 inches. If you are replacing a power supply in a Dell system, this is a viable option. It is not the correct match for your Lenovo TFX chassis.
Quick picks
Our 7 picks
LXun 310W Lenovo TFX Power Supply
Best for: Lenovo TFX desktop replacements with low-power GPUs
- Wattage
- 310W
- PCIe Connector Type
- 6+2pin
- Warranty
- 1 Year
- Form Factor
- TFX
- Dimensions
- 5.9 × 3.2 × 2.6 inches
- Weight
- 1.79 pounds
View on Amazon: LXun 310W Lenovo TFX Power Supply Affiliate link
This LXun 310W TFX power supply replaces original Lenovo units like the PCJ007. It delivers 310W total output across three +12V rails, each rated at 18A. The unit features a 10-pin motherboard connector and dual 6+2-pin PCIe cables. Its 5.9×3.2×2.6 inch size fits standard TFX cases. It supports low-power graphics cards up to 90W. The fan uses temperature control for quiet operation.
Pros
- 310W total power output across three +12V rails
- 10-pin motherboard connector for Lenovo compatibility
- Dual 6+2-pin PCIe connectors for GPU power
- Temperature-controlled fan operation
- Compact 5.9×3.2×2.6 inch TFX form factor
Cons
- Limited to 90W graphics card upgrades
- Non-modular fixed cables reduce cable management flexibility
- Only 1-year warranty coverage
Good fit if
- You need a direct replacement for Lenovo TFX models like the M310 or ThinkCentre series
- You are upgrading a system with a low-power graphics card under 90W
- You require a 10-pin connector for your specific motherboard
Skip if
- You need high wattage for power-hungry components exceeding 310W
- You plan to install a graphics card drawing more than 90W
- You prefer modular cables for cleaner case builds
Verdict: LXun 310W TFX Power Supply is a suitable replacement for Lenovo desktops requiring a 10-pin TFX unit. It fits users with modest GPU upgrades who need a direct swap for models like the M310 or ThinkCentre M920s.
SilverStone 300W Bronze TFX Power Supply
Best for: compact systems needing 300W efficiency
- Wattage
- 300W
- Efficiency Rating
- 80 PLUS Bronze
- Modularity
- Fixed Cable
- PCIe Connector Type
- PCI-E 6pin
- Fan Size
- 80mm
- Form Factor
- TFX
View on Amazon: SilverStone 300W Bronze TFX Power Supply Affiliate link
This SilverStone unit delivers 300W of continuous power in a standard TFX form factor. It carries an 80 PLUS Bronze efficiency rating and runs on an 80mm fan rated for silent operation at 18 dBA. The fixed cables include a single 6-pin PCIe connector. It is designed for 24/7 use and fits systems requiring a compact, reliable power supply with moderate graphics needs.
Pros
- 80 PLUS Bronze efficiency certification
- 300W continuous output rated for 40°C
- Standard TFX form factor
- Quiet 80mm fan at 18 dBA
- Built for 24/7 operation
Cons
- Lower 300W capacity compared to 400W options
- Fixed cables limit cable management flexibility
- Only one 6-pin PCIe connector available
Good fit if
- You need a standard TFX replacement
- You want 80 PLUS Bronze efficiency
- You run low-power graphics cards
Skip if
- You require modular cable management
- You need high-wattage GPU support
- You want more than one PCIe connector
Verdict: SilverStone TX300-VT 300W TFX is a quiet, efficient choice for users who need a reliable 300W TFX unit with fixed cables. It suits builds with modest power requirements and standard case sizes.
Corsair RM850x Shift 850W White ATX Power Supply
Best for: high-performance ATX desktop builds
- Wattage
- 850W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- PCIe 5.1
- Dimensions
- 6.3 × 5.91 × 3.39 inches
View on Amazon: Corsair RM850x Shift 850W White ATX Power Supply Affiliate link
This Corsair unit delivers 850W of power in a standard ATX form factor. It features full modularity and 80 Plus Gold efficiency. The ATX 3.1 and PCIe 5.1 standards support modern graphics cards. It measures 6.3 inches long. This power supply suits users building high-performance desktops who need reliable, efficient power delivery for demanding components.
Pros
- 850W output capacity
- Fully modular cable design
- 80 Plus Gold efficiency rating
- Supports ATX 3.1 and PCIe 5.1 standards
Cons
- ATX form factor does not fit TFX cases
- Larger dimensions than TFX alternatives
- Higher wattage than needed for basic office PCs
Good fit if
- You are building a high-end ATX desktop
- You need PCIe 5.1 support for new GPUs
- You want high efficiency for lower heat output
Skip if
- You have a Lenovo TFX case
- You need a compact TFX form factor
- You are replacing a 310W OEM unit
Verdict: Corsair RM850x Shift 850W ATX is a robust choice for standard ATX builds requiring high power and modern connector support. It is not suitable for compact TFX systems or direct replacements for low-wattage OEM units.
Corsair RM850x 850W Fully Modular ATX 3.1 PSU
Best for: high-performance ATX desktop builds
- Wattage
- 850W
- Efficiency Rating
- Cybenetics Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- PCIe Version
- PCIe 5.1
View on Amazon: Corsair RM850x 850W Fully Modular ATX 3.1 PSU Affiliate link
The Corsair RM850x is a high-wattage ATX power supply designed for modern systems. It delivers 850W of power with a fully modular design, allowing you to use only the cables you need. It supports ATX 3.1 and PCIe 5.1 standards, featuring the new 12V-2x6 connector for latest graphics cards. This unit offers Cybenetics Gold efficiency and low-noise operation. It is a robust choice for builders needing significant power headroom.
Pros
- 850W output capacity for high-end components
- Fully modular cable design for clean builds
- ATX 3.1 and PCIe 5.1 compliance
- Cybenetics Gold efficiency rating
- Includes 12V-2x6 connector for new GPUs
Cons
- ATX form factor does not fit TFX cases
- Physical dimensions are much larger than TFX units
- 850W is excessive for low-power Lenovo systems
Good fit if
- You are building a standard ATX desktop
- You need high wattage for powerful GPUs
- You want fully modular cable management
Skip if
- You need a TFX form factor for a small case
- You are replacing a 310W Lenovo power supply
- You require a compact, low-wattage unit
Verdict: Corsair RM850x Fully Modular ATX is a powerful option for standard ATX builds but is physically incompatible with TFX chassis. It suits users needing high wattage and modern PCIe support rather than those replacing small form factor supplies.
Corsair RM750x Shift White 750W ATX Power Supply
Best for: Side-mounted modular ATX builds
- Wattage
- 750W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- Fan Size
- 140mm
- PCIe Version
- PCIe 5.1
View on Amazon: Corsair RM750x Shift White 750W ATX Power Supply Affiliate link
The Corsair RM750x Shift is a 750W ATX power supply with 80 Plus Gold efficiency. It features side-mounted modular connectors and fully modular micro-fit cables for cleaner cable management. This unit supports ATX 3.1 and PCIe 5.1 standards. It uses a 140mm fan with a zero RPM mode. It suits builders who prioritize modern connectivity and side-panel access over compact form factors.
Pros
- Side-mounted modular connections for easier access
- Fully modular micro-fit PSU cables
- ATX 3.1 and PCIe 5.1 certified
- 140mm fan with zero RPM mode
Cons
- Standard ATX form factor, not TFX
- Heavier build at 3.75 pounds
- Larger dimensions than TFX units
Good fit if
- You need side-mounted modular connectors
- You require ATX 3.1 compatibility
- You prefer a 140mm fan for low noise
Skip if
- You have a TFX case
- You need a compact form factor
- You require a 310W power supply
Verdict: Corsair RM750x Shift 750W ATX fits builders who need side-mounted modular connectors and ATX 3.1 support. It does not work for TFX cases or low-wattage Lenovo systems.
Corsair RM1000e 1000W ATX Power Supply
Best for: high-wattage standard ATX desktop builds
- Wattage
- 1000 Watt
- Efficiency Rating
- 80 PLUS Gold
- Modularity
- Fully Modular
- Form Factor
- ATX
- Size
- 1000W
- Dimensions
- 5.91 × 5.51 × 3.39 inches
View on Amazon: Corsair RM1000e 1000W ATX Power Supply Affiliate link
This Corsair unit delivers 1000W of power in a standard ATX form factor. It features fully modular cabling and 80 PLUS Gold efficiency. The build supports 105°C-rated capacitors and includes dual EPS12V connectors. It measures 5.91 by 5.51 by 3.39 inches and weighs 3.66 pounds. You need this if you require high wattage for a standard desktop, not a TFX chassis.
Pros
- 1000W output capacity
- Fully modular cable design
- 80 PLUS Gold efficiency rating
- Dual EPS12V connectors
Cons
- ATX form factor does not fit TFX cases
- 1000W is excessive for low-power builds
- Significantly larger and heavier than TFX units
Good fit if
- You are building a standard ATX desktop
- You need high wattage for multiple GPUs
- You want fully modular cabling for clean setups
Skip if
- You have a Lenovo TFX chassis
- You need a compact 300W power supply
- You are upgrading a small form factor PC
Verdict: Corsair RM1000e 1000W ATX is a high-capacity standard power supply. It fits users building large desktops who need ample power and clean cable management.
BackPlanePro 300W TFX Power Supply
Best for: Dell Inspiron SFF replacement builds
- Wattage
- 300W
- Fan Size
- 80mm
- Warranty
- One Year
- Form Factor
- TFX
- Dimensions
- 6.89 × 2.56 × 3.35 inches
- Weight
- 3 pounds
View on Amazon: BackPlanePro 300W TFX Power Supply Affiliate link
This BackPlanePro unit is a 300W TFX power supply designed for Dell Inspiron SFF systems. It features an 80mm silent fan and active PFC for stable output. The grey unit measures 6.89 by 3.35 by 2.56 inches and weighs 3 pounds. It includes a one-year warranty. You should consider this if you need a direct replacement for older slimline desktops requiring a TFX form factor.
Pros
- 300W output capacity for standard builds
- 80mm silent fan for cooling
- Active PFC for efficient power conversion
- Compact TFX form factor fits slim cases
Cons
- Lower wattage than many modern alternatives
- Only a one-year warranty period
- Fixed cable configuration limits flexibility
Good fit if
- You need a replacement for a Dell Inspiron 530s or 531s
- You require a TFX form factor for a MicroATX slim case
- You prioritize silent operation with an 80mm fan
Skip if
- You need more than 300W of power
- You require a modular cable system
- You want a longer warranty than one year
Verdict: BackPlanePro 300W TFX Power Supply is a suitable replacement for older Dell Inspiron slimline desktops. It fits users who need a compact TFX unit with active PFC and a silent 80mm fan.
Specifications side by side
| Spec | LXun 310W Lenovo TFX Power Supply | SilverStone 300W Bronze TFX Power Supply | Corsair RM850x Shift 850W White ATX Power Supply | Corsair RM850x 850W Fully Modular ATX 3.1 PSU | Corsair RM750x Shift White 750W ATX Power Supply | Corsair RM1000e 1000W ATX Power Supply | BackPlanePro 300W TFX Power Supply |
|---|---|---|---|---|---|---|---|
| Wattage | 310W | 300W | 850W | 850W | 750W | 1000 Watt | 300W |
| Efficiency Rating | not stated | 80 PLUS Bronze | 80 Plus Gold | Cybenetics Gold | 80 Plus Gold | 80 PLUS Gold | not stated |
| Modularity | not stated | Fixed Cable | Fully Modular | Fully Modular | Fully Modular | Fully Modular | not stated |
| ATX Version | not stated | not stated | ATX 3.1 | ATX 3.1 | ATX 3.1 | not stated | not stated |
| PCIe Connector Type | 6+2pin | PCI-E 6pin | PCIe 5.1 | 12V-2x6 | not stated | not stated | not stated |
| Fan Size | not stated | 80mm | not stated | not stated | 140mm | not stated | 80mm |
| Warranty | 1 Year | not stated | not stated | not stated | not stated | not stated | One Year |
| Form Factor | TFX | TFX | ATX | ATX | ATX | ATX | TFX |
| PCIe Version | not stated | not stated | PCIe 5.1 | PCIe 5.1 | PCIe 5.1 | not stated | not stated |
| Connector | not stated | not stated | not stated | 12V-2x6 Connector | not stated | not stated | not stated |
| Size | 5.9×3.2×2.6 inches | 300W | 850W | 850W | 750W | 1000W | not stated |
| Dimensions | 5.9 × 3.2 × 2.6 inches | 6.9 × 3.4 × 2.6 inches | 6.3 × 5.91 × 3.39 inches | 2.3 × 3.39 × 5.91 inches | 6.3 × 5.91 × 3.39 inches | 5.91 × 5.51 × 3.39 inches | 6.89 × 2.56 × 3.35 inches |
| Weight | 1.79 pounds | 3 pounds | 3.75 pounds | 3.9 pounds | 3.75 pounds | 3.66 pounds | 3 pounds |
| Model | PCJ007 SP50H29573 | SST-TX300 | not stated | not stated | CP-9020273-NA | not stated | LYSB00CXAUQJK-CMPTRACCS |
| Color | not stated | black (lead-free paint) | White | Black | White | Black | Grey |
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Frequently asked questions
Can I use a Corsair RM850x in my Lenovo TFX desktop?
No, you cannot. The Corsair RM850x is an ATX power supply, while your Lenovo system requires a TFX form factor. The ATX unit measures 5.91 by 3.39 inches and weighs 3.75 pounds. It is physically incompatible with compact TFX chassis designed for low-wattage OEM units like the LXun 310W.
Is the SilverStone TX300-VT a direct replacement for the LXun unit?
Yes, it is a direct physical replacement. Both units use the TFX form factor, allowing them to fit in the same space. The SilverStone model measures 6.9 inches in length and weighs 3 pounds. It provides 300W of power and includes fixed cables, making it suitable for modest power requirements.
What is the size of the LXun 310W power supply?
The LXun 310W measures 5.9 inches in length, 3.2 inches in width, and 2.6 inches in height. It weighs 1.79 pounds. This compact footprint allows it to replace original equipment manufacturer units in small form factor desktops like the Lenovo ThinkCentre M920s without requiring case modifications.
Does the Corsair RM750x Shift work for side-mounted builds?
Yes, the Corsair RM750x Shift is designed for side-mounted modular connectors. It supports ATX 3.1 and PCIe 5.1 standards. However, it is an ATX unit, not TFX. It does not work for TFX cases or low-wattage Lenovo systems, so it is only suitable for standard ATX builds.
Is the BackPlanePro 300W TFX suitable for Dell Inspiron systems?
Yes, it is suitable for older Dell Inspiron slimline desktops. This unit features a TFX form factor with an active PFC system and a silent 80mm fan. It measures 6.89 inches in length and weighs 3 pounds. It provides a compact power solution for users needing a direct replacement in these specific chassis.
What efficiency rating does the SilverStone 300W TFX have?
The SilverStone 300W TFX carries an 80 Plus Bronze efficiency rating. This indicates it converts AC power to DC power with reduced waste compared to standard units. It offers 300W of output in a quiet, reliable package. This efficiency makes it a good choice for users prioritizing power savings in compact systems.
Can I use a 1000W power supply in a Lenovo TFX case?
No, you cannot. The Corsair RM1000e is an ATX power supply designed for large desktop builds. It measures 5.91 inches in length and weighs 3.66 pounds. Lenovo TFX cases require the specific 5.9 by 3.2 by 2.6 inch form factor. The ATX unit will not physically fit or connect to your motherboard.