Antec Signature Titanium 1000 W Review - Return of the Legend 25

Antec Signature Titanium 1000 W Review - Return of the Legend

Load Regulation, Hold-up Time, Inrush Current, Efficiency & Noise »


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

The legendary Antec Signature line has been brought back to life. Only this time, the OEM is Seasonic and not Delta, and efficiency and wattage are much higher. The new Signature units with model numbers SP1000, SP1300, and ST1000 use Seasonic's Prime platform, and the MSRP of these PSUs is set to $230, $270, and $280 respectively. They are pretty expensive, but address extreme enthusiasts who are willing to spend a lot to get a topnotch power supply.

The most efficient model of the line, the Signature 1000 Titanium, will be the main subject of this review. It is a fully modular 80 PLUS Titanium efficiency PSU with the ETA-A+ (91%–94% overall efficiency) and LAMBDA-A (20–25 dBA) efficiency and noise certifications on the Cybenetics scale. It is difficult for a high wattage PSU to remain quiet, especially at heavy loads, but the more efficient the platform, the lower the thermal loads, which means a more relaxed fan-speed profile can be used.

In the bundle, you will also find three Velcro straps and the usual zip ties. Some included thumb screws would have also be nice.

The PSU comes in a pouch instead of a plastic wrap. This is a nice detail, especially for such an expensive product.


Antec Signature 1000 Titanium Features & Specs
Max. DC Output1000 W
EfficiencyETA-A+ (91%–94%) & 80 PLUS Titanium
NoiseLAMBDA-A (20–25 dBA)
ModularYes (fully)
Intel C6/C7 Power State SupportYes
Operating Temperature0–40 °C
ProtectionsOver Voltage Protection
Under Voltage Protection
Over Power Protection
Over Temperature Protection
Over Current Protection
Short Circuit Protection
Cooling135 mm fluid dynamic bearing fan (HA13525M12F-Z)
Semi-passive operationYes (selectable)
Dimensions150 mm (W) x 85 mm (H) x 170 mm (D)
Weight2.18 kg (4.81 lb)
ComplianceATX12V v2.31, EPS 2.92
Warranty10 years
Price at Time of Review (excl. VAT)$279.99

The warranty is set to ten years—Seasonic offers two more years for its Prime models. In any case, both are long, and the two-year difference is not a deal-breaker for someone who prefers the Antec model in terms of looks or for the OC Link feature, which allows two Signature PSUs to operate in tandem for a truly power hungry system. This is a cool feature, but efficiency at light loads goes south if you use two PSUs for the same system, and you will need a large chassis to accommodate both PSUs. I prefer a stronger PSU instead of two with a lower capacity for normal situations outside of extreme overclocking.

Antec Signature 1000 TitaniumPower Specs
Rail3.3 V5 V12 V5 VSB-12 V
Max. Power25 A25 A83 A3 A0.3 A
125 W996 W15 W3.6 W
Total Max. Power1000 W

Cables and Connectors

DescriptionCable CountConnector Count (total)GaugeIn Cable Capacitors
ATX connector 20+4 pin (610 mm)1118-22AWGNo
4+4 pin EPS12V (650 mm)2218AWGNo
6+2 pin PCIe (750 mm)4418AWGNo
6+2 pin PCIe (680 mm+70 mm) 2418AWGNo
SATA (400 mm+115 mm+115 mm+115 mm)2818AWGNo
SATA (350 mm+150 mm+150 mm+150 mm)1418AWGNo
SATA (300 mm+150 mm)1218AWGNo
4-pin Molex (450 mm+120 mm+120 mm)1318AWGNo
4-pin Molex (350 mm+120 mm)1218AWGNo
FDD Adapter (105 mm)1122AWGNo
4 pin Molex to SATA 3.3V Adapter (150 mm+150 mm)1218AWGNo
OC Link Cable (460 mm)1124AWGNo
AC Power Cord (1400 mm) - C13 coupler1116AWG-

It is strange to find 18AWG gauges in a high-end PSU with 1 kW power output. Load regulation could even be better with thicker wires, and there would also be a small efficiency boost, mostly at high loads. However, thicker gauges lead to less flexible cables, which can be a major headache. A strong advantage of this PSU is that it doesn't use any in-cable caps.

There are a huge number of connectors, including two EPS, eight PCIe, 14 SATA, and five 4-pin Molex connectors. Unfortunately, the 4-pin Molex connectors are only 120 mm apart.

There is also a 4-pin Molex to SATA adapter, compatible with the SATA 3.3 (announced on February 16, 2016) and SATA 3.2+ specifications, which introduced the power disable (PWDIS) feature. This feature utilizes the third pin (P3) of the SATA connector, which in the older SATA specifications is tied to the first (P1) and second (P2) pins, and all of them take the 3.3 V rail for the attached drive. According to the newer SATA specification, P3 is now independent and transfers the power disable signal. This means a new HDD that supports the power disable feature will not start if combined with a PSU with the older SATA connectors featuring 3.3 V at P3 because the HDD will see a continuous high-state signal on P3. It will get stuck in a hard reset condition, which will prevent it from spinning up.

Component Analysis

Antec Signature 1000 Titanium Parts Description
General Data
Manufacturer (OEM)Seasonic
PCB TypeDouble-sided
Primary Side
Transient Filter6x Y caps, 3x X caps, 2x CM chokes, 1x MOV, 1x discharge IC
Bridge Rectifier(s)2x LVB2560 (600 V, 25 A @ 105 °C)
Inrush Current ProtectionNTC Thermistor MF72 5D-20 & relay
APFC MOSFETs2x Infineon IPP60R099C7 (650 V, 14 A @ 100 °C, 0.099 ohm)
APFC Boost Diode1x STPSC10H065D (650 V, 10 A @ 135 °C)
Hold-up Cap(s)1x Rubycon (400 V, 820 uF, 3,000 h @ 105 °C, MXK) & 1x Rubycon (400 V, 470 uF, 2,000 h @ 105 °C, MXH)
Main Switchers4x Infineon IPP50R140CP (550 V, 15 A @ 100 °C, 0.14 ohm)
IC Drivers2x Silicon Labs Si8230BD
APFC ControllerON Semiconductor NPC1654
Switching ControllerChampion CM6901T2
TopologyPrimary side: full-bridge & LLC converter
Secondary side: synchronous rectification & DC-DC converters
Secondary Side
+12 V6x SiR638DP (40 V, 100 A @ 70 °C, 0.88 mOhm)
+5 V & +3.3 VDC-DC Converters: no info
PWM Controllers: no info
Filtering CapacitorsElectrolytic: 4x Nippon Chemi-Con (105 °C, W), 4x Nippon Chemi-Con (4–10,000 h @ 105 °C, KY), 1x Nippon Chemi-Con (4–10,000 h @ 105 °C, KYB), 1x Nippon Chemi-Con (1–5,000 h @ 105°C, KZE), 1x Nippon Chemi-Con (5–6,000 h @ 105°C, KZH), 1x Rubycon (3–6,000 h @ 105 °C, YXG)
Polymer: 24x FPCAP, 14x NIC
Supervisor ICWeltrend WT7527V (OVP, UVP, OCP, SCP, PG )
Fan ModelHong Hua HA13525M12F-Z (135 mm, 12 V, 0.36 A, fluid dynamic bearing fan)
5VSB Circuit
Rectifiers1x STMicroelectronics STF6N65K3 FET (650 V, 3 A @ 100 °C, 1.3 ohm) & 1x M.C.C MBR1045ULPS SBR (45 V, 10 A)
Standby PWM ControllerLeadtrend  LD7750R
-12V Circuit
Standby PWM ControllerLite-On LSP5523 (3A max output current )

The PSU uses Seasonic's Prime platform, which is among the best. The design is cutting edge, and the build quality is great. Seasonic uses good (and expensive) parts to achieve top performance and high reliability. Most of the filtering caps belong to good Japanese lines, and the Hong Hua fan with a fluid dynamic bearing has proven reliable and, best of all, doesn't notably increase the production cost.

The first part of the transient filter is on the PCB that holds the AC receptacle, while the second is on the main PCB.

This part (MOV) provides protection against voltage surges. The platform also has an NTC thermistor, which is supported by a bypass relay to restrict inrush currents during the start-up phase.

Seasonic used two bridge rectifiers, which can handle up to 50 A combined.

This is the APFC converter. It uses quality parts, including Infineon FETs and Rubycon bulk caps rated at 105 °C and a lifetime of 2,000 hours. My only objection here is the low voltage rating of the bulk caps. 400 V is very close to the APFC converter's DC bus voltage (385–390 VDC).

The PFC controller, an NPC1654 IC covered in black tape to make it more resistant to EMI noise, is installed on a small daughter board.

The main FETs are arranged into a full-bridge topology. An LLC resonant converter is also used for higher efficiency.

The drivers for the main FETs are installed on the solder side of the main PCB.

The LLC resonant converter is a Champion CM6901T2 IC.

The heatsinks on the secondary side are used to cool down the FETs installed on the back of the main PCB. These handle the +12 V rail.

Two DC-DC converters generate the minor rails.

Both the electrolytic and polymer filtering caps are by Japanese manufacturers, and most belong to good lines.

The board shown in these photos hosts the supervisor IC, a Weltrend WT7527V.

The PWM controller of the 5VSB circuit is a LSP5523 IC.

There is a dedicated board for the -12 V rail.

The modular board uses bus bars to transfer power to the sockets without major energy losses.

Soldering quality is satisfactory, although this is not the best I have seen from Seasonic.

The Hong Hua fans offer good performance and reliability without breaking the bank, which is why most PSU manufacturers prefer them.
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