Tom's Hardware Verdict

The ST1000-PTS has compact dimensions and achieves high efficiency but there are better options in the same price range.

Pros

+
Full power at 47 degrees Celsius
+
Efficient
+
High Power Factor readings
+
Low inrush currents
+
Fully modular
+
8x PCIe & 2x EPS connectors
+
Compact dimensions

Cons

-
Modest performance
-
Inaccurate power ok signal
-
Over Current & over Protections are improperly set
-
High spike during the 5VSB turn-on test

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Specifications and Part Analysis

The major assets of the SilverStone ST1000-PTS power supply are its compact dimensions (142mm or 5.59 inches depth), low noise output and the highly efficient platform, which meets the 80 PLUS Platinum and Cybenetics ETA-A+ efficiency standards. Is this is enough though to justify the high asking price of $254 (£195)? The fact is that there are better performing products in the same price range, so SilverStone has to either lower this unit's price or release a new version with improved performance, to keep up with the tough competition from Corsair, FSP and Seasonic.

We have already evaluated the ST1200-PTS, so it was a matter of time before we put its smaller brother on the test bench. The SilverStone ST1000-PTS has the same compact dimensions with the 1200W unit, but because of the smaller capacity it achieves a lower power density score which still looks impressive though, at 554W per liter (it is 664W per liter for the ST1200-PTS). Clearly SilverStone participates in an endless race with one goal in mind, to downsize its power supplies as much as possible. Some years ago, a PSU with only 140mm length had a hard time achieving 750W max power and we see nowadays similar dimension units going up to 1200W, while still keeping the noise output low.

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Manufacturer (OEM)	Enhance Electronics
Max. DC Output	1000W
Efficiency	80 PLUS Platinum, ETA-A+ (91-94%)
Noise	LAMBDA-A (20-25 dB[A])
Modular	✓ (Fully)
Intel C6/C7 Power State Support	✓
Operating Temperature (Continuous Full Load)	0 - 40°C
Over Voltage Protection	✓
Under Voltage Protection	✓
Over Power Protection	✓
Over Current (+12V) Protection	✓
Over Temperature Protection	✓
Short Circuit Protection	✓
Surge Protection	✓
Inrush Current Protection	✓
Fan Failure Protection	✗
No Load Operation	✓
Cooling	120mm Sleeve Bearing Fan (D12SH-12)
Semi-Passive Operation	✗
Dimensions (W x H x D)	152 x 87 x 142mm
Weight	1.99 kg (4.39 lb)
Form Factor	ATX12V v2.4, EPS 2.92
Warranty	5

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Modular Cables
Description	Cable Count	Connector Count (Total)	Gauge	In Cable Capacitors
ATX connector 20+4 pin (600mm)	1	1	16-22AWG	No
4+4 pin EPS12V (750mm)	1	1	16AWG	No
4+4 pin EPS12V (550mm)	1	1	16AWG	No
6+2 pin PCIe (550mm+150mm)	4	8	16-18AWG	No
SATA (610mm+140mm+140mm+140mm)	2	8	18AWG	No
4-pin Molex (610mm+150mm+150mm) / FDD (+150mm)	2	6 / 2	18-22AWG	No
AC Power Cord (1400mm) - C13 coupler	1	1	16AWG	-

All cables are modular and there are two EPS connectors along with eight PCIe ones. Actually the ST1000-PTS uses exactly the same cable configuration as the ST1200-PTS, meaning that it offers a great amount of connectors. The distance between the peripheral connectors is ideal at 140-150mm, but for the PCIe ones, a 100-110mm clearance would be better, since the corresponding sockets on power hungry graphics cards are usually installed side by side.

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General Data
Manufacturer (OEM)	Enhance Electronics
PCB Type	Double Sided
Primary Side
Transient Filter	6x Y caps, 3x X caps, 2x CM chokes, 1x MOV
Inrush Protection	NTC Thermistor & Relay
Bridge Rectifier(s)	1x RS2505M-U1 (600V, 25A @ 150°C)
APFC MOSFETS	4x Infineon IPP50R140CP (550V, 15A @ 100°C, 0.14Ohm)
APFC Boost Diode	2x CREE C3D08060A (600V, 8A @ 152°C)
Hold-up Cap(s)	2x Nippon Chemi-Con (450V, 560uF, 2000h @ 105°C, KMW)
Main Switchers	4x Infineon IPP50R140CP (550V, 15A @ 100°C, 0.14Ohm)
IC Driver	2x Silicon Labs Si8230BD
APFC Controller	ATK AT6101ZS & CM03X Green PFC Controller
Resonant Controllers	Champion CM6901T6
Topology	Primary side: Interleaved PFC, Full-Bridge & LLC converter Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETS	8x Infineon BSC014N04LS (40V, 100A @ 100°C, 1.4mOhm)
5V & 3.3V	DC-DC Converters: 4x Infineon BSC018NE2LS (25V, 97A @ 100°C, 1.4mOhm) PWM Controllers: ANPEC APW7160A
Filtering Capacitors	Electrolytics: Nippon Chemi-Con (4-10,000 @ 105°C, KY), Rubycon (3-6,000 @ 105°C, YXG), Suncon (105°C) Polymers: Unicon (UPH), CapXon (PT)
Supervisor IC	SITI PS223 (OCP, OTP, OVP, UVP, SCP, PG)
Fan Model	Yate Loon D12SH -12 (120mm, 12V, 0.30A, Rifle Bearing Fan)
5VSB Circuit
Rectifier	1x PFR10V45CT SBR (45V, 10A)
Standby PWM Controller	ATK AT6002H

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The platform is provided by Enhance Electronics and, on the primary side, a full bridge topology is used along with an LLC resonant converter. On the secondary side, a synchronous rectification scheme is used for the +12V rail, with eight FETs handling this rail, and the minor rails are generated through a pair of DC-DC converters. The electrolytic filtering caps are provided by respectable manufacturers and are of high quality. The majority of polymer caps is provided by Unicon; we also found several CapXon polymer caps.

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