[케이스/파워] Seasonic X Series 750 W

Specifications

Seasonic X-750 Features & SpecsMax. DC OutputPFCEfficiencyOperating temperatureProtectionsCoolingDimensionsWeightComplianceWarrantyPrice at time of review (exc. VAT)

750W

Active PFC

80 PLUS Gold

0°C - 50°C

Over Voltage Protection Under Voltage Protection Over Current Protection Over Power Protection Over Temperature Protection Short Circuit Protection

120 mm Double Ball-Bearing Fan

150 mm (W) x 86 mm (H) x 160 mm (D)

2.1 kg

ATX12V v2.31, EPS 2.92

7 years

＄139.99

Seasonic X-750 Power SpecsRailMax. PowerTotal Max. Power

3.3V	5V	12V	5VSB	-12V
25A	25A	62A	3A	0.5A
125W		744W	15W	6W
750W

Cables & Connectors, Power Distribution

Modular CablesATX connector (600mm)8 pin EPS12V (650mm)4+4 pin EPS12V (650mm)6+2 pin PCIe (560mm+100mm)SATA (390mm+120mm+120mm+120mm)SATA (300mm+120mm)4 pin Molex (500mm+120mm+120mm)4 pin Molex (300mm+120mm)FDD Adapter (+100mm)

20+4 pin
1
1
4
8
2
3
2
1

Packaging

Contents

Exterior

A Look Inside & Component Analysis

Primary Rails Voltage Regulation

Hold-up Time

Inrush Current

Voltage Regulation and Efficiency Measurements

Voltage Regulation & Efficiency Testing Data 
Seasonic X-750

Test	12 V	5 V	3.3 V	5VSB	Power (DC/AC)	Efficiency	Fan Speed	Fan Noise	Temp (In/Out)	PF/AC  Volts
20% Load	10.567A	1.981A	1.969A	0.981A	149.72W	91.99%	0 RPM	0 dBA	48.25°C	0.911
	12.128V	5.039V	3.345V	5.096V	162.76W				39.65°C	230.0V
40% Load	21.514A	3.968A	3.948A	1.180A	299.65W	93.29%	0 RPM	0 dBA	50.83°C	0.961
	12.108V	5.034V	3.341V	5.078V	321.20W				41.50°C	229.9V
50% Load	26.883A	4.962A	4.938A	1.579A	374.62W	93.07%	957 RPM	37.8 dBA	40.09°C	0.971
	12.096V	5.031V	3.339V	5.061V	402.50W				46.90°C	229.9V
60% Load	32.250A	5.958A	5.929A	1.980A	449.52W	92.87%	1446 RPM	45.4 dBA	41.20°C	0.977
	12.086V	5.029V	3.338V	5.045V	484.01W				48.24°C	229.9V
80% Load	43.192A	7.954A	7.918A	2.388A	599.44W	92.29%	1774 RPM	50.9 dBA	42.11°C	0.982
	12.065V	5.023V	3.333V	5.020V	649.55W				50.42°C	229.8V
100% Load	54.767A	8.961A	8.914A	3.004A	749.20W	91.48%	1808 RPM	51.3 dBA	44.20°C	0.985
	12.043V	5.019V	3.329V	4.991V	819.00W				54.29°C	229.7V
110% Load	61.015A	8.965A	8.922A	3.005A	823.96W	90.91%	1828 RPM	51.5 dBA	45.32°C	0.985
	12.035V	5.017V	3.328V	4.984V	906.35W				57.31°C	229.8V
Crossload 1	1.963A	15.004A	15.005A	0.502A	151.83W	86.45%	1503 RPM	46.5 dBA	42.86°C	0.921
	12.113V	5.027V	3.337V	5.092V	175.63W				48.50°C	230.1V
Crossload 2	61.950A	1.000A	1.003A	1.002A	759.87W	92.00%	1814 RPM	51.3 dBA	44.24°C	0.985
	12.049V	5.025V	3.337V	5.051V	825.95W				55.40°C	229.8V

Efficiency

Efficiency at Low Loads

Efficiency at Low Loads 
Seasonic X-750

Test #	12 V	5 V	3.3 V	5 VSB	Power (DC/AC)	Efficiency	Fan Speed	Fan Noise	PF/AC  Volts
1	1.827A	1.980A	1.969A	0.195A	39.75W	82.57%	0 RPM	0 dBA	0.728
	12.138V	5.042V	3.348V	5.124V	48.14W				230.0V
2	3.393A	1.981A	1.969A	0.389A	59.75W	86.73%	0 RPM	0 dBA	0.789
	12.137V	5.042V	3.348V	5.118V	68.89W				230.0V
3	4.961A	1.980A	1.969A	0.586A	79.77W	88.89%	0 RPM	0 dBA	0.832
	12.135V	5.041V	3.347V	5.112V	89.74W				229.9V
4	6.526A	1.981A	1.969A	0.779A	99.73W	90.18%	0 RPM	0 dBA	0.861
	12.133V	5.040V	3.347V	5.105V	110.59W				229.9V

5VSB Efficiency

5VSB Efficiency
Seasonic X-750

Test #	5VSB	Power (DC/AC)	Efficiency	PF/AC Volts
1	0.102A	0.52W	69.33%	0.043
	5.134V	0.75W		230.3V
2	0.252A	1.29W	76.79%	0.094
	5.131V	1.68W		230.3V
3	1.002A	5.12W	80.13%	0.261
	5.112V	6.39W		230.4V
4	3.002A	15.21W	81.64%	0.384
	5.065V	18.63W		230.2V

Power Consumption in Idle & Standby

Idle / Standby 
Seasonic X-750

Mode	12 V	5 V	3.3 V	5VSB	Power (AC)	PF/AC Volts
Idle	12.146V	5.044V	3.351V	5.137V	5.55W	0.247
						230.3V
Standby					0.20W	0.012
						230.3V

Fan RPM, Delta Temperature and Output Noise

+12V Voltage Regulation Chart

5V Voltage Regulation Chart

3.3V Voltage Regulation Chart

Efficiency Chart

+12V Ripple Chart

5V Ripple Chart

3.3V Ripple Chart

5VSB Ripple Chart

Advanced Transient Response Tests

Advanced Transient Response 20%

Voltage	Before	After	Change	Pass/Fail
12 V	12.125V	12.047V	0.64%	Pass
5 V	5.038V	4.970V	1.35%	Pass
3.3 V	3.346V	3.235V	3.32%	Pass
5VSB	5.098V	5.064V	0.67%	Pass

Advanced Transient Response 50%

Voltage	Before	After	Change	Pass/Fail
12 V	12.094V	12.016V	0.64%	Pass
5 V	5.030V	4.958V	1.43%	Pass
3.3 V	3.340V	3.225V	3.44%	Pass
5VSB	5.063V	5.028V	0.69%	Pass

Transient Response at 20% Load

Transient Response at 50% Load

Turn-On Transient Tests

Ripple Measurements

Ripple Measurements
Seasonic X-750

Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	23.9 mV	13.0 mV	11.5 mV	4.4 mV	Pass
40% Load	29.3 mV	13.1 mV	12.2 mV	5.6 mV	Pass
50% Load	28.9 mV	13.2 mV	12.3 mV	6.3 mV	Pass
60% Load	30.4 mV	13.3 mV	12.3 mV	6.6 mV	Pass
80% Load	34.3 mV	14.6 mV	12.9 mV	7.3 mV	Pass
100% Load	39.0 mV	16.6 mV	14.1 mV	8.6 mV	Pass
110% Load	42.3 mV	18.0 mV	14.2 mV	9.3 mV	Pass
Crossload 1	25.1 mV	15.2 mV	13.5 mV	22.4 mV	Pass
Crossload 2	38.8 mV	14.2 mV	13.1 mV	23.4 mV	Pass

Ripple at Full Load

Ripple at 110% Load

Ripple at Crossload 1

Ripple at Crossload 2

Performance Rating

Performance per Dollar

Value and Conclusion

9.3

The Seasonic X-750 retails for ＄139.99

Delivered full power at 45°C Good ripple suppression Higly efficient Tight voltage regulation Nice price/performance ratio Fully modular Nippon Chemi-Con electrolytic caps Semi-fanless (hybrid) operation Seven-year warranty

The fan operation control switch should be at the front of the PSU

Seasonic's technicians had a very difficult task to complete, which was to further improve an already excellent platform. Taking into account the results I obtained by putting together this review and the results of other PSUs that utilize the new platform (Corsair AX860 and AX760), I can easily state that the new platform is significantly more efficient than the older one, and especially at lower loads does it provide tighter voltage regulation and generally higher performance. I think that designs like this one push the conventional methods based on analog circuits to their limits. Only digital control can possibly offer noticeably better results at increased cost; that is, for the time being. Seasonic has a winner in their hands with their fresh KM3 platform, and I can safely assume that they will easily lead the performance race. The new X-750 is Gold certified, but it offer efficiency that many Platinum certified units will envy given it provides super stable and ultra clean DC outputs. It can also operate in fanless mode most of the time because of its cold operation and hybrid fan-control system and has a fully modular design, which increases its usability greatly. The most important facet of all is the price at which Seasonic offers their new X-750; it is, to say the least, decent and fully justified because of the X-750's performance, its features and the long warranty that backs it up.  To sum up, the X-750's high price/performance ratio renders it a no-brainer in its category, especially if you don't want to spend more money* on a Platinum Corsair/Seasonic unit.  * After the review was posted, Seasonic informed us that the price of this unit will be increased by ten bucks, reaching ＄149.99 on the 1/1/2013. Unfortunately, some retailers already increased the price of the unit before the end of 2012.