FSP Dagger Pro 850W Review - Tiny Power Plant 4

FSP Dagger Pro 850W Review - Tiny Power Plant

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We would like to thank FSP for supplying the review sample.

FSP's Dagger Pro line consists of four SFX form factor models with capacities ranging from 550 to 850 W. In this review, I will take a detailed look at the strongest member of the line, which is among the strongest SFX PSUs available on the market today. Since this is a powerful, compact PSU and some users would like to use it with a normal ATX chassis, FSP was kind enough to throw an SFX to ATX adapter into the bundle. For most SFX PSUs, such an adapter doesn't make much sense since they have short cables, which leads to compatibility issues. With the 850 W Dagger Pro, the cables that matter, ATX and EPS, are long, so you won't have a problem unless installing it into a cave-sized chassis. On the other hand, long cables can be an issue for cable management inside a small Mini-ITX chassis.

The other specifications of the Dagger Pro unit include a single +12 V rail, the semi-passive operation, Japanese electrolytic capacitors for increased reliability, and a double ball-bearing fan. Most manufacturers prefer fluid dynamic bearing fans because they produce less output noise. Still, ball-bearing fans are highly tolerant to high operating temperatures, making them more suitable for stressful conditions. In addition to that, with the proper fan-speed profile, noise output can be kept low at normal operating temperatures even with a double ball-bearing fan.


FSP Dagger Pro 850W
Features & Specifications
Max. DC Output850 Watt
Efficiency (115 V)80 PLUS Gold, Cybenetics Platinum
Efficiency (230 V)Cybenetics Silver
NoiseCybenetics Standard+ (35–40 dBA)
ModularYes (fully)
Intel C6/C7 Power State SupportYes
Operating Temperature0–50 °C
ProtectionsOver Voltage Protection
Under Voltage Protection
Over Power Protection
Over Temperature Protection
Over Current Protection
Short Circuit Protection
Cooling92mm double ball bearing fan (PLA09215B12H)
Semi-Passive OperationYes
Dimensions (W x H x D)125 x 65 x 100 mm
Weight0.95 kg (2.09 lb)
ComplianceSFX12V V3.3, EPS 2.92
Warranty10 years
Price at Time of Review (excl. VAT)$209.99
FSP Dagger Pro 850W
Power Specifications
Rail3.3 V5 V12 V5 VSB-12 V
Max. Power20 A20 A70.83 A2.5 A0.3 A
120 W850 W12.5 W3.6 W
Total Max. Power850 W

The Dagger Pro 850 W is only Cybenetics Silver certified with 230 V input because of the increased standby power (>0.2 W). With 115 V input, it is Cybenetics Platinum certified.
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