The SeaSonic Focus Gold SGX-650 SFX Power Supply Review: Seasonic Starts off SFX With a Stunner
by E. Fylladitakis on March 7, 2019 8:30 AM EST- Posted in
- Cases/Cooling/PSUs
- Seasonic
- PSUs
- SFX
- Focus Gold SGX
Hot Test Results
Even though they complied with the design power quality guidelines, earlier SFX PSU designs often displayed poor power quality figures. However, more recent models, like the powerful SilverStone SX700-LPT and Corsair’s SF450, were greatly improved. The SeaSonic Focus Gold SGX-650 also delivers excellent power quality figures, comparable to those of the better ATX PSUs available.
Overall, filtering is very good on all lines. Our instruments recorded a maximum voltage ripple on the 12V line of only 26 mV under maximum load, with equally low voltage ripple figures on the secondary 3.3V and 5V lines. Voltage regulation is equally impressive, with the 12V maintaining a regulation of 1.0% within the nominal load range and even tighter regulation on the secondary lines.
Main Output | ||||||||
Load (Watts) | 131,66 W | 328,95 W | 489,82 W | 651,52 W | ||||
Load (Percent) | 20,26% | 50,61% | 75,36% | 100,23% | ||||
Amperes | Volts | Amperes | Volts | Amperes | Volts | Amperes | Volts | |
3.3 V | 1,78 | 3,38 | 4,45 | 3,38 | 6,67 | 3,35 | 8,89 | 3,34 |
5 V | 1,78 | 5,06 | 4,45 | 5,04 | 6,67 | 5,03 | 8,89 | 5,02 |
12 V | 9,6 | 12,15 | 24,01 | 12,14 | 36,01 | 12,05 | 48,02 | 12,02 |
Line | Regulation (20% to 100% load) |
Voltage Ripple (mV) | |||||
20% Load | 50% Load | 75% Load | 100% Load | CL1 12V |
CL2 3.3V + 5V |
||
3.3V | 0,9% | 8 | 8 | 12 | 12 | 8 | 16 |
5V | 0,8% | 10 | 12 | 16 | 18 | 8 | 20 |
12V | 1,1% | 12 | 16 | 20 | 26 | 30 | 26 |
Looking at our hotbox test results, although the energy conversion efficiency of the SeaSonic Focus Gold SGX-650 does not drop significantly at first when it's inside the hotbox, there is a significant degradation once the load passes 550 Watts. This suggests that the PSU is finally getting thermally stressed at this point. The average efficiency reduction is 1.1%, with a drop of over 2.5% at 100% load, indicating significant thermal stress.
Meanwhile when it comes to cooling, when placed in our hotbox the fan in the SeaSonic Focus Gold SGX-650 started almost immediately after the PSU was powered-on. Noise levels were initially low but the dB(A) figures start climbing quickly when the load passed 300 Watts, with the PSU relying on the thin 120 mm fan for reliable operation. The fan reached its maximum speed with a 585 Watt load, struggling to maintain operational temperatures inside the PSU. Overall the fan does manage to keep the SeaSonic Focus Gold SGX-650 operational under these harsh operating conditions, if only barely.
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PeachNCream - Friday, March 8, 2019 - link
Hmm, what is your tolerance point for very common acronyms like CPU or RAM for instance where the acronym itself is broadly understood and, to a great extent, replaced the underlying terminology from which they are derived? Maybe it would be helpful for Anandtech to host a technology term glossary or at least refer the reader to an existing one elsewhere.TelstarTOS - Monday, March 11, 2019 - link
Corsair SF are a little better, but it's always good to have more choices.mahdu4ungt - Saturday, April 6, 2019 - link
http://madhu-mumbaiescorts.commahdu4ungt - Saturday, April 6, 2019 - link
https://madhuvipservice.blogspot.com/mahdu4ungt - Saturday, April 6, 2019 - link
https://plus.google.com/u/0/111700830844612306528mahdu4ungt - Saturday, April 6, 2019 - link
https://hyderabad4night.blogspot.com/mahdu4ungt - Saturday, April 6, 2019 - link
http://madhutomar.blogspot.comullbeking - Sunday, August 25, 2019 - link
Regarding all the confusion about whether the form factor is SFX or SFX-L, I think the problem is with Seasonic. I was browsing their SFX/-L PSU's yesterday and I was confused by the Seasonic site itself. The online catalog of SFX/-L PSU's is difficult make sense of, for me.Are there 3 "SFX/-L" PSU's in total, or is the total 4?
It would be more useful if Seasonic updated their own website. Our information really derives from that.