The FSP Dagger Pro SFX 850W PSU Review: Awesome Power in a Small Shellby E. Fylladitakis on September 16, 2022 8:00 AM EST
- Posted in
- 80Plus Gold
Cold Test Results (~25°C Ambient)
For the testing of PSUs, we are using high precision electronic loads with a maximum power draw of 2700 Watts, a Rigol DS5042M 40 MHz oscilloscope, an Extech 380803 power analyzer, two high precision UNI-T UT-325 digital thermometers, an Extech HD600 SPL meter, a self-designed hotbox and various other bits and parts. For a thorough explanation of our testing methodology and more details on our equipment, please refer to our How We Test PSUs - 2014 Pipeline post.
The efficiency of the FSP Dagger Pro 850W unit does meet the 80Plus Gold certification when the unit is powered from a 115 VAC source. Powering the PSU from a 230 VAC outlet will result in a slightly better overall efficiency, especially under heavy loads, but the figures are well below the 80Plus Gold certification limits. It has an average nominal load efficiency of 91.8% when powered from a 230 VAC source, which drops down to 91% if powered from a 115 VAC source.
FSP implemented a “hybrid” fan controller that allows for the fan to completely stop when the load is low. Unlike other implementations, it is not possible to turn this feature off. As expected, the internal temperatures of the PSU rise sharply under low loads due to the lack of active cooling but quickly stabilize once the fan starts. Due to the mediocre efficiency and very compact size of the unit, its internal temperatures are relatively high.
The use of a low-profile 92 mm fan inside such a compact unit with significant thermal losses did have the expected side effect of high audible sound pressure levels. The fan will not start when the load is low but does start the moment the load is greater than 200 Watts. Once the fan starts, it quickly becomes clearly audible, with the noise staying within relatively comfortable boundaries up to about 500 Watts.
Post Your CommentPlease log in or sign up to comment.
View All Comments
Oxford Guy - Friday, September 16, 2022 - linkSmall form factors and high wattage are generally mutually exclusive, unless you have impaired hearing and no tinnitus.
'The use of a low-profile 92 mm fan inside such a compact unit with significant thermal losses did have the expected side effect of high audible sound pressure levels.
Once the fan starts, it quickly becomes clearly audible, with the noise staying within relatively comfortable boundaries up to about 500 Watts.'
So, maybe these companies should start calling these units 500W models rather than 850.
meacupla - Sunday, September 18, 2022 - linkThe only reason to get an 850W for SFX PSUs, is so that the PC won't crash when an RTX 3080Ti, or something as power hungry, causes a massive transient spike.
You could probably get away with a 750W ATX PSU, but SFX PSUs are known for not handling transient spikes as well as ATX.
Harry_Wild - Monday, September 26, 2022 - linkLooking for a rectangle shape for my Lenovo Workstation SFF desktop! 850W would be great! $170.00 …sold!
shamaizas - Saturday, October 15, 2022 - linkwdsd
shamaizas - Saturday, October 15, 2022 - linkI feel distinctly about it and love adapting also concerning this issue. In the event that conceivable, as you get authority, would you mind restoring your blog with additional data? It is unbelievably huge for me.