FSP DAGGER PRO ATX3.0 (PCIe5.0) 850W Review: The Ultimate White Powerhouse for Compact High-End Builds


Introducing the “DAGGER PRO ATX3.0 (PCIe5.0) 850W” from FPS FSP, a pristine white power supply designed especially for ITX and M-ATX users. This compact power unit boasts the SFX12V V4.0, ATX3.0, and PCIe5.0 standards. It’s built with top-quality Japanese electrolytic capacitors and features a single +12V output along with a DC-DC design. Impressively, it has achieved an 80 Plus Gold certification, demonstrating over 90% conversion efficiency. What makes it stand out even more is its all-white flat modular cables, ensuring that enthusiasts with a penchant for white-themed rigs experience a unified aesthetic.


  • Standard: ATX12V V3.0 (SFX12V V4.0)
  • Power Rating: 850W
  • Size: SFX
  • Efficiency Certification: 80 PLUS Gold
  • Voltage Input Range: 100-240V
  • Input Current: 12-6A
  • Frequency: 50-60Hz
  • Power Factor Correction: Active PFC
  • Efficiency: Above 90%
  • Cooling Fan: 92mm Ball-bearing
  • Dimensions: 125 × 100 × 63.5 mm
  • Protective Features: OCP, OVP, SCP, OPP, OTP

White Modular Cables:

  • 1x ATX/MB 20+4 Pin
  • 2x CPU/EPS 4+4 Pin
  • 1x PCIe 12+4 Pin (12VHPWR)
  • 2x PCIe 6+2 Pin (total of 4 connectors)
  • 1x SATA (total of 4 connectors)
  • 2x SATA combined with 2 large 4-pin connectors

FSP DAGGER PRO ATX3.0(PCIe5.0) 850W power supply unboxing/gold medal Japanese SFX easy to install

FSP introduces its DAGGER PRO ATX3.0(PCIe5.0) 850W white power supply. Designed with an SFX compact size, it’s an ideal fit for both ITX and M-ATX cases. This unit boasts an 80 Plus Gold certification, showcasing a 90% high conversion efficiency. It comes with a single +12V output, features a DC-DC design, and incorporates premium Japanese electrolytic capacitors. Additionally, it’s equipped with a 92mm cooling fan that has an automatic stop feature.

The DAGGER PRO ATX3.0 (PCIe5.0) aligns with the latest ATX12 V3.0 and EPS12V V2.92 standards, ensuring it can handle increased CPU peak currents. Impressively, it can support a 200% surge in the 12VHPWR dynamic output for a brief 100 microseconds, ensuring compatibility with the latest CPUs and GPUs that have higher instantaneous current demands.

For connectivity, the power supply offers 2 CPU/EPS 4+4 Pin connectors, ensuring seamless upgrades to high-performance processors like Ryzen 9 and Core i9. For GPUs, it provides a native PCIe 12+4 Pin (12VHPWR) connector, and an additional 2 PCIe 6+2 Pin connectors, accommodating both NVIDIA and AMD graphic cards’ requirements.

FSP DAGGER PRO ATX3.0(PCIe5.0) 850W white version outer box.
The back has the features and specifications of the product.

The power accessory kit comes with modular flat cables, a power cord, ATX bracket plates, jumper connectors, mounting screws, and accompanying documentation.

Power Accessories.

The DAGGER PRO ATX3.0 (PCIe5.0) 850W, with its compact SFX size, sports a pristine white exterior and is adorned with a DAGGER PRO decal on its side.

DAGGER PRO ATX3.0(PCIe5.0) 850W white version.

Moreover, the power supply features a smart fan speed regulation system. The fan will automatically halt when the load falls below 20%. Between a load of 20-50%, it maintains a quiet operation at 20 dBA. As the load surpasses 50%, the fan speed progressively ramps up to its maximum capacity.

Ball 92mm cooling fan.
Mains input and power switch.

The power module features a variety of connectors, including an ATX/MB 20+4 Pin, connectors for 2 CPUs, 2 PCIe connectors, 1 12VHPWR connector, and 2 sets of connectors for peripheral modules.

Power module connector.

The readings from the power meter indicate that a single +12V rail can achieve a peak current of 70.83A, amounting to a total power draw of 850W.

Power meter.

The power supply’s cooling mechanism utilizes a PLA09215B12H 92mm ball bearing fan. Internally, it’s designed with an Active Power Factor Correction (APFC), an LLC half-bridge resonant configuration, and a DC-DC voltage stabilization architecture.

Internal design of power supply.
PLA09215B12H 92mm ball bearing fan.

Naturally, the white model comes equipped with white modular flat cables. Whether it’s the MB, CPU, PCIe 12+4 Pin (12VHPWR), SATA, or other connectors, they are all fashioned in white. This is perfect for those who have always desired a completely white-themed setup.

Power module cable.
ATX/MB 20+4 Pin connector.

There are 2 CPU/EPS 4+4 Pin connectors for CPU power supply.

CPU connector.

Traditional PCIe power supplies typically come with 2 PCIe 6+2 Pin connectors, totaling 4 connectors. However, for graphics cards from series like the RTX 30 or RX 7000 and below, it’s advisable to use just one PCIe 6+2 Pin connector per cable. This ensures a consistent and stable power delivery to the graphics card.

PCIe connector.

The PCIe 12+4 Pin (12VHPWR) connector is white. As outlined in the included documentation, it’s essential to plug the connector directly into its designated port. Furthermore, one should ensure sufficient bending room between the connector on the power supply side and the graphics card end. Avoid excessively compressing the wire, as this can lead to uneven contact points.

White PCIe 12+4 Pin (12VHPWR) connector.
PCIe 12+4 Pin (12VHPWR) installation recommendations.
Enough space must be left at the joint to avoid excessive bending.
  1. The first features 4 SATA connectors arranged in a Y-shaped configuration. This design simplifies the installation process.
  2. The second offers a combination of 2 SATA connectors and 2 larger 4-pin connectors. However, the SATA connectors in this configuration are of the piercing type. If storage devices are positioned very close to the motherboard or base plate, installing such a SATA power connector can pose challenges.
SATA power connector.

The DAGGER PRO ATX3.0 (PCIe5.0) includes a white SFX to ATX adapter bracket, catering to those enthusiasts who opt for M-ATX compact cases but prefer to utilize an SFX power supply. This choice can free up additional space within the case. For instance, when using a non-modular case like the FSP CST360(W) in tandem with a more compact SFX power supply, users benefit from enhanced cable management space and the flexibility to accommodate longer graphics cards.

SFX to ATX keyhole fixing plate.
FSP CST360(W) can have more space when paired with SFX power supply.
Power lock hole on the top of the casing.

FSP DAGGER PRO ATX3.0(PCIe5.0) 850W and RTX 4070 Ti stress test

For the evaluation, the OCCT stress testing software was employed to simultaneously load test both the CPU and GPU. This software assessed the motherboard-reported voltage levels for +12V, +5V, and +3.3V. Additionally, the NVIDIA PACT tool was utilized to monitor the GPU’s power consumption and its current fluctuations during gaming sessions. The testing setup comprised of an AMD Ryzen 9 7950X processor and an RTX 4070 Ti graphics card.

DAGGER PRO ATX3.0(PCIe5.0) 850W with GIGABYTE GeForce RTX 4070 Ti EAGLE graphics card.

Testing Setup:

  • Processor: AMD Ryzen 9 7950X
  • Motherboard: ROG CROSSHAIR X670E HERO
  • Memory: G.Skill DDR5-6000 16GBx2
  • Graphics card: GIGABYTE GeForce RTX 4070 Ti EAGLE
  • System Disk: Solidigm P41 Plus 1TB PCIe 4.0 SSD
  • Cooling System: 280mm AIO water cooling
  • Power Supply: FSP DAGGER PRO ATX3.0 (PCIe5.0) 850W
  • Operating System: Windows 11 Pro 22H2

Testing Results: The CPU and GPU underwent stress testing using OCCT. At the peak of this test, the entire system’s power consumption approached approximately 600W. Voltage readings from the motherboard, as reported by OCCT, revealed that the +12V was consistently stable, fluctuating only between 12.000-12.096V. The +5V and +3.3V readings also remained steady, indicating that the power supply can reliably handle the simultaneous high loads exerted by the premium R9 7950X and RTX 4070 Ti components.

OCCT Power Test.
HWINFO motherboard sensor value.
Maximum computer power consumption is 600W.

NVIDIA PACT Tool Results:

  • In standby, the first set of 12V1 voltage registered at 12.076V / 0.505A / 6.099W. During this period, the power consumption of the graphics card’s PCIe Slot was a mere 5.6W.
  • While running “Dynasty 2077” at 4K resolution with ray tracing set to maximum (“crazy” setting) and using DLSS 3 at quality settings, the GPU’s average power draw was approximately 248W. It spiked to an instantaneous maximum of 296W during gameplay. During this phase, the 12V1 rail recorded a current of 16.6A.
  • In the Furmark Xtreme stress test, the GPU consumed an average power of 278.6W, peaking momentarily at 297.9W. The 12V1 rail’s measured power metrics during this test were 12.026V, 21.3A, and 257W.

These tests further demonstrate the power supply’s capability to manage significant loads from high-end components and deliver power efficiently and reliably.

Standby 12V1.
“Dian Yu Rebel 2077” GPU power consumption.
Furmark Xtreme burn-in GPU power consumption.


FSP’s latest DAGGER PRO ATX3.0 (PCIe5.0) 850W power supply boasts a compact SFX design. It proudly carries the 80 PLUS Gold certification, ensuring up to 90% conversion efficiency. With a robust 850W capacity, it can effortlessly handle power-hungry CPUs such as the Ryzen 9 and Core i9. However, when it comes to GPUs, it is recommended for use with up to the RTX 4080. Pairing it with an i9 and an RTX 4090 could push its limits, potentially surpassing the 900W mark.

This model adheres to the ATX12 V3.0 and EPS12V V2.92 standards and features dual 8-pin CPU power connectors. This ensures compatibility with M-ATX motherboards requiring CPU power. In terms of GPU power, it offers a native PCIe 12+4 Pin 12VHPWR module line, making it suitable for the newer RTX 40 and RTX 30 series graphic cards. Additionally, it comes with 2 PCIe 6+2 Pin power connectors, ensuring compatibility even with AMD graphics cards.

For enthusiasts in Taiwan, this pristine white DAGGER PRO ATX3.0 (PCIe5.0) power supply comes with a price tag of NT$5,090. It’s a perfect match for ITX or M-ATX users who desire a compact, white, high-capacity power supply capable of meeting the needs of top-tier CPUs and GPUs.

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Title: FSP DAGGER PRO ATX3.0 (PCIe5.0) 850W Review: The Ultimate White Powerhouse for Compact High-End Builds