Corsair RM1000x (2021) Power Supply Review
Tom’s Hardware Verdict
The new Corsair RM1000x achieves high performance, and it keeps its noise output low. Moreover, it is highly efficient at light loads and comes with a top-quality fan.
Pros
- +
+ Full power at 47 degrees Celsius
- +
+ High overall performance
- +
+ Quiet operation
- +
+ Fully compliant with ATX v2.52
- +
+ Highly efficient at light loads
- +
+ Long hold-up time
- +
+ Low inrush current
- +
+ Magnetic Levitation fan
- +
+ Loads of cables and connectors
- +
+ Fully modular
- +
+ 10-year warranty
Cons
- —
High OCP triggering points on the minor rails
- —
A small overall efficiency boost would be nice
- —
In cable capacitors
- —
Small distance between peripheral connectors
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Today’s best Corsair RM1000x deals
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The Corsair RM1000x achieves high performance, and it isn’t noisy, despite its increased max power output. It uses quality parts, including Japanese caps and a Magnetic Levitation fan, ideal for operation under high operating temperatures. It is fully compatible with the newest ATX spec (2.52), so among others, it offers high efficiency under super-light loads, and it also supports Microsoft’s Modern Standby, which allows for speedy wake-from-sleep times (you also need a compatible motherboard). This is one of the best 1000W Gold PSUs, and if it weren’t for the Corsair AX1000, it would easily get a spot in our best PSU’s picks article. A strong opponent for this product is the Super Flower Leadex V Gold with a similar capacity.
Corsair decided to revamp its more successful line in the upper-range category.
The RMx models managed to steal the spotlight from the higher-end RMi units since they offered a better performance per price ratio. The last time Corsair refreshed this line was three years ago, in 2018. PSUs have a much longer lifetime than other IT products, but in this case, Jon Gerow, Corsair’s R&D PSU director, decided that it was high time for some changes.
Besides the change from a rifle bearing to a more durable (and more expensive as well) fan, the new RMx units are fully compatible with the newest ATX spec, so they have over 70% efficiency with 2% load, and the PWR_OK delay is within the 100-150ms region, to support the Alternative Sleep Modes (ASM), including Microsoft’s Modern Standby mode.
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(Image credit: Future)
Product Photos
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The strongest member of the RMx line has 1000W max power so that it can be the heart of a demanding system, equipped with a potent CPU and a pair of graphics cards (not a pair Nvidia RTX 3080/90 or a pair of AMD RX 6800/6900 XT VGAs, though).
For gaming purposes, using two graphics cards is next to useless. However, in some applications, still, multiple GPUs bring huge performance gains (e.g., rendering applications like the OctaneRender, VRAY GPU, and Redshift).
Externally the differences between the old and new RMx units are notable. The fan grille is different, and the same goes for the front exhaust. Both use triangular perforations, which look nice.
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Product Photos
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Specifications
Swipe to scroll horizontally
|
Manufacturer (OEM) |
CWT |
|
Max. DC Output |
1000W |
|
Efficiency |
80 PLUS Gold, Cybenetics Gold (87-89%) |
|
Noise |
Cybenetics A- (25-30 dB[A]) |
|
Modular |
✓ (fully) |
|
Intel C6/C7 Power State Support |
✓ |
|
Operating Temperature (Continuous Full Load) |
0 — 50°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 |
140mm Magnetic Levitation Fan (NR140ML) |
|
Semi-Passive Operation |
✓ |
|
Dimensions (W x H x D) |
150 x 85 x 180mm |
|
Weight |
1. |
|
Form Factor |
ATX12V v2.52, EPS 2.92 |
|
Warranty |
10 Years |
99 kg (4.39 lb)Power Specifications
Swipe to scroll horizontally
| Rail | 3.3V | 5V | 12V | 5VSB | -12V | |
|---|---|---|---|---|---|---|
| Max. Power | Amps | 20 | 20 | 83.3 | 3 | 0.3 |
| Watts | 150 | 999.6 | 15 | 3.6 | ||
Total Max. Power (W) |
1000 |
Cables & Connectors
Swipe to scroll horizontally
| Modular Cables | Row 0 — Cell 1 | Row 0 — Cell 2 | Row 0 — Cell 3 | Row 0 — Cell 4 |
| Description | Cable Count | Connector Count (Total) | Gauge | In Cable Capacitors |
| ATX connector 20+4 pin (610mm) | 1 | 1 | 16-20AWG | Yes |
| 4+4 pin EPS12V (650mm) | 3 | 3 | 18AWG | Yes |
| 6+2 pin PCIe (600mm+150mm) | 3 | 6 | 16-18AWG | Yes |
| SATA (500mm+110mm+110mm+110mm) | 2 | 8 | 18AWG | No |
| SATA (520mm+110mm+110mm) | 2 | 6 | 18AWG | No |
| 4-pin Molex (450mm+100mm+100mm+100mm) | 2 | 8 | 18AWG | No |
| AC Power Cord (1400mm) — C13 coupler | 1 | 1 | 16AWG | — |
This is the first power supply that we evaluate, with three EPS connectors.
As it seems Corsair knows something that we don’t or else there wouldn’t be so many of these connectors. There are also three cables with six PCIe in total. The RM1000x can have three EPS and six PCIe connectors available at the same time! This can be too much, even for a 1000W PSU.
The number of peripheral connectors is sky-high, but the distance between the peripheral connectors is too short at 100mm. Ideally, these connectors should be 150mm away from each other.
It wasn’t easy to connect the main ATX cable on our sample because the connectors’ pair on this cable is not aligned with the PSU’s corresponding modular sockets. We had to twist the cable a bit until the connectors aligned. We contacted Corsair about this, and they informed us that this issue was only with our 1000W review samples, where we got the wrong ATX cable. Please note that the RM1000x uses a different ATX cable from the RM850x and RM750x.
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(Image credit: Tom’s Hardware)
Cable Photos
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Component Analysis
We strongly encourage you to have a look at our PSUs 101 article, which provides valuable information about PSUs and their operation, allowing you to better understand the components we’re about to discuss.
Swipe to scroll horizontally
| General Data | — |
| Manufacturer (OEM) | CWT |
| PCB Type | Double Sided |
| Primary Side | — |
| Transient Filter | 6x Y caps, 2x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | NTC Thermistor SCK203R0 (3 Ohm) & Relay |
| Bridge Rectifier(s) | 2x GBJ2006 (600V, 20A @ 110°C) |
| APFC MOSFETs | 3x Vishay SiHF30N60E (650V, 18A @ 100°C, Rds(on): 0.125Ohm) |
| APFC Boost Diode | 1x On Semiconductor FFSP1065A (650V, 10A @ 152°C) |
| Bulk Cap(s) |
2x Nippon Chemi-Con (400V, 680uF & 470uF each or 1. 150uF combined, 2,000h @ 105°C, KMW)
|
| Main Switchers | 2x Infineon IPW60R099C6 (650V, 24A @ 100°C, Rds(on): 0.099Ohm) |
| APFC Controller | Champion CM6500UNX & Champion CM03X |
| Resonant Controller | Champion CU6901VAC |
| Topology |
Primary side: APFC, Half-Bridge & LLC converter Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | — |
| +12V MOSFETs | 8x Intenational Rectifier IRFH7004PbF (40V, 164A @ 100°C, Rds(on): 1.4mOhm) |
| 5V & 3.3V |
DC-DC Converters: 2x UBIQ QM3054M6 (30V, 61A @ 100°C, Rds(on): 4.8mOhm) & 2x UBIQ QN3107M6N (30V, 70A @ 100°C, Rds(on): 2.6mOhm) |
| Filtering Capacitors |
Electrolytic: 2x Nippon Chemi-Con (105°C, W), 4x Nippon Chemi-Con (1-5,000h @ 105°C, KZE), 9x Nippon Chemi-Con (4-10,000h @ 105°C, KY), 1x Rubycon (4-10,000h @ @ 105°C, YXJ) |
| Change Over Switch | 1x Sync Power SPN3006 MOSFET (30V, 57A @ 100°C, Rds(on): 5. 5mOhm) |
| Supervisor IC | Weltrend WT7502R (OVP, UVP, SCP, PG) |
| Fan Controller | Microchip PIC16F1503 |
| Fan Model | Corsair NR140ML (140mm, 12V, 0.27A, Magnetic Levitation Bearing Fan) |
| 5VSB Circuit | — |
| Rectifier | 1x PS1045L SBR (45V, 10A) & IPS ISD04N65A |
| Standby PWM Controller | On-Bright OB5282 |
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Overall Photos
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The OEM didn’t change, so Channel Well Technology (CWT) makes the new RMx units. The platform has several differences from the previous one to offer improved performance and ATX v2.52 compatibility. The major change is the new fan, while the PCB’s dimensions remain the same with the older platform.
It is nice to see normal dimensions and not a downsized PCB because, in most cases, smaller dimensions bring increased noise output because there is not enough room between the PSU’s components affecting airflow and increasing at the same time, operating temperatures.
Corsair used good capacitors on both primary and secondary sides, and the MOSFETs are of high quality. This is an expensive platform, especially if we take into account the inflated prices in PSU parts.
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(Image credit: Tom’s Hardware)
Transient filter
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The EMI filter is complete with six Y and two X caps, two CM chokes, and an MOV. There is also an NTC thermistor for lower inrush currents, which is supported by a bypass relay.
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Bridge rectifiers
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The two bridge rectifiers are powerful, able to handle 40 Amps combined!
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APFC converter
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The APFC converter uses three Vishay FETs and a single but powerful boost diode.
Chemi-Con provides the bulk caps. Combined, they have 1150uF capacity.
The APFC controller is a Champion CM6500UNX IC, supported by a CM03X.
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(Image credit: Tom’s Hardware)
Main FETs and primary transformer
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The primary switching FETs are two Infineon IPW60R099C6, configured in a half-bridge topology. The LLC resonant controller is a Champion CU6901VAC.
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12V FETs and VRMs
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Eight Intenational Rectifier IRFH7004PbF FETs regulate the 12V rails. The FETs are installed on a vertical board, residing right beside the main transformer.
The VRMs, responsible for generating the minor rails, use four FETs and the common PWM controller is a UPI Semi uP3861P.
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(Image credit: Tom’s Hardware)
Filtering caps
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All electrolytic filtering caps are provided by Japanese manufacturers, Chemi-Con and Rubycon, and are rated at 105 degrees Celsius.
Lots of FPCAP polymer caps are also used.
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Modular board front
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Many polymer caps are installed on the modular board, forming an extra ripple filtering layer.
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5VSB circuit
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The 5VSB circuit uses a pair of SBRs, and the standby PWM controller is an On-Bright OB5282.
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(Image credit: Tom’s Hardware)
Soldering quality
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Soldering quality is not that good. This looks more than a pre-production unit than a mass production one. Most likely, our review samples are among the early ones.
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(Image credit: Tom’s Hardware)
Cooling fan
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The cooling fan uses a Magnetic Levitation bearing to last for ages, even under high operating temperatures.
This is one of the best fan bearings, if not the best, but expensive and not easy to manufacture. A vertical board holds the fan’s controller and the supervisor IC.
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Specifications and Part Analysis
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Aris Mpitziopoulos is a Contributing Editor at Tom’s Hardware US, covering PSUs.
EVGA SuperNOVA 850 G7 Power Supply Review
Tom’s Hardware Verdict
The EVGA SuperNOVA 850 G7 from offering top-performance. FSP, the OEM behind the G7 line, made an excellent platform with a high power density.
Pros
- +
Full power at 47 degrees Celsius
- +
Top overall performance
- +
Good build quality
- +
Efficient enough 5VSB rail
- +
Tight load regulation
- +
Good transient response
- +
Good ripple suppression
- +
Fully modular
- +
Loads of connectors
- +
Compatible with the alternative sleep mode
- +
Compact dimensions
- +
PSU load indicators
- +
10-year warranty
Cons
- —
No PCIe 5.
0 connectors - —
Highly set OCP at 12V and OPP
- —
High inrush currents
- —
Power factor could be higher with 230V input
- —
Small distance between the peripheral connectors
Why you can trust Tom’s Hardware
Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out more about how we test.
Today’s best EVGA SuperNOVA 850 G7 deals
$189.99
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$189.99
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It’s time for a new leadership power supply: The EVGA SuperNOVA 850 G7 outperforms the mighty Corsair RM850x (2021), earning a place in our list of the best PSUs.
It might not have a 12+4 pin PCIe connector yet, but it offers top performance and super-compact dimensions. The 850W G7 and G6 units have the same price tags. You should go with the first if you are interested in pure performance or choose the second if you care more about noise output.
FSP is providing the platforms. The G2 and G3 lines were by Super Flower, G5 by FSP and G6 used the Seasonic Focus platform. The power density scores go through the roof with only 130 mm in length for all G7 units. So far, we haven’t encountered such small ATX form-factor PSUs, especially in 1,000 W and 850 W capacities. There is no room to go any smaller than that, without sacrificing the 120 mm fan for a smaller one, which would lead to increased noise. If you need smaller PSUs, you should look at the SFX-L and SFX form factors.
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- EVGA SuperNOVA 850 G7 (Gold) at Amazon for $189.
99
The exterior design looks nice with a light blue fan grille, fully modular cable design and compact dimensions.
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On one of the PSU’s sides you will find five LED indicators, which depict the load level.
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Specifications
Swipe to scroll horizontally
| Manufacturer (OEM) | FSP |
| Max. DC Output | 850W |
| Efficiency | 80 PLUS Gold, Cybenetics Platinum (89-91%) |
| Noise | Cybenetics Standard++ (30-35 dB[A]) |
| Modular | ✓ |
| Intel C6/C7 Power State Support | ✓ |
| Operating Temperature (Continuous Full Load) | 0 — 50°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 Fluid Dynamic Bearing Fan (MGA12012XF-O25) |
| Semi-Passive Operation | ✓(selectable) |
| Dimensions (W x H x D) | 150 x 85 x 130mm |
| Weight | 1. 72 kg (3.79 lb) |
| Form Factor | ATX12V v2.52, EPS 2.92 |
| Warranty | 10 Years |
Power Specifications
Swipe to scroll horizontally
| Rail | Row 0 — Cell 1 | 3.3V | 5V | 12V | 5VSB | -12V |
| Max. Power | Amps | 24 | 24 | 70.8 | 3 | 0.5 |
| Row 2 — Cell 0 | Watts | Row 2 — Cell 2 | 120 | 850 | 15 | 6 |
Total Max. Power (W) |
Row 3 — Cell 1 | Row 3 — Cell 2 | 850 | Row 3 — Cell 4 | Row 3 — Cell 5 | Row 3 — Cell 6 |
Cables and Connectors
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| Description | Cable Count | Connector Count (Total) | Gauge | In Cable Capacitors |
|---|---|---|---|---|
| ATX connector 20+4 pin (600mm) | 1 | 1 | 18-22AWG | Yes |
| 4+4 pin EPS12V (700mm) | 2 | 2 | 18AWG | No |
| 6+2 pin PCIe (700mm+150mm) | 2 | 4 | 18AWG | No |
| 6+2 pin PCIe (700mm) | 2 | 2 | 18AWG | No |
| SATA (550mm+100mm+100mm) | 3 | 9 | 18AWG | No |
| 4-pin Molex (550mm+100mm+100mm+100mm) | 1 | 4 | 18AWG | No |
| FDD Adapter (100mm) | 1 | 1 | 22AWG | No |
| AC Power Cord (1390mm) — C13 coupler | 1 | 1 | 16AWG | — |
All the cables are long, and the amount of connectors is sufficient.
With two EPS and six PCIe connectors, the PSU won’t have any problems delivering its full power. There are also plenty of peripheral connectors, but the distance between them is short.
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(Image credit: Tom’s Hardware)
FSP used in-cable caps in the ATX cable for better ripple suppression, so don’t expect this cable to be highly flexible.
Component Analysis
We strongly encourage you to have a look at our PSUs 101 article, which provides valuable information about PSUs and their operation, allowing you to better understand the components we’re about to discuss.
Swipe to scroll horizontally
| General Data | — |
| Manufacturer (OEM) | FSP |
| PCB Type | Double Sided |
| Primary Side | — |
| Transient Filter | 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | NTC Thermistor SCK-056 (5 Ohm) & Relay |
| Bridge Rectifier(s) | 2x |
| APFC MOSFETs | 3x |
| APFC Boost Diode | 1x |
| Bulk Cap(s) |
1x Nippon Chemi-Con (420V, 470uF, 2,000h @ 105°C, KHE) & 1x TK (420V, 330uF, 2,000h @ 105°C, LGW) |
| Main Switchers |
2x Infineon IPP60R120P7 (600V, 16A @ 100°C, Rds(on): 0. 12Ohm)
|
|
IC Driver |
1x Novosense NSi6602 |
| APFC Controller | Infineon ICE2PCS02 |
| Resonant Controller | Champion CM6901T2X |
| Topology |
Primary side: APFC, Half-Bridge & LLC converter Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | — |
| +12V MOSFETs | no info |
| 5V & 3.3V | DC-DC Converters: 6x Infineon BSC0901NS (30V, 94A @ 100°C, Rds(on): 1.9mOhm) PWM Controller(s): ANPEC APW7159C |
| Filtering Capacitors |
Electrolytic: 5x Rubycon (3-6,000h @ 105°C, YXG) |
| Supervisor IC | Weltrend WT7527RA (OCP, OVP, UVP, SCP, PG) |
| Fan Controller | Microchip PICF15324 |
| Fan Model | Protechnic Electric MGA12012XF-O25 (120mm, 12V, 0. 52A, Fluid Dynamic Bearing Fan) |
| 5VSB Circuit | — |
| Rectifier | 1x NIKO-SEM P1006BD (60V, 42A @ 100°C, Rds(on): 10mOhm) FET |
| Standby PWM Controller | Power Integrations INN2603K |
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The OEM behind this platform is FSP, and it looks nice! The only problem is that because of the overpopulated, tiny PCB, we had a tough time identifying all parts without heavy de-soldering, which could destroy the PSU, and we need it for future reference in case we have to re-test it. FSP used good parts, and the design is up to date, with a half-bridge topology and an LLC resonant converter on the primary side. The secondary side hosts a synchronous rectification scheme for the 12V rail and DC-DC converters for the minor rails.
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The EMI filter is complete so that EMI emissions won’t be an issue, both incoming and outgoing. We also found an MOV for handling voltage surges and an NTC thermistor and bypass relay combo, for protection against high inrush currents.
(Image credit: Tom’s Hardware)
The pair of bridge rectifiers is sandwiched between two heat sinks.
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The APFC converter uses three FETs and a single boost diode. The PFC controller is installed on a vertical board, an Infineon ICE2PCS02. The same board also hosts an operational amplifier (op-amp). The bulk caps are a weird mix of Chemi-Con and TK. Usually, identical bulk caps are used, but in this case, we find two different.
A good reason for this can be the shortage of caps.
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Two Infineon IPP60R120P7 are the main FETs, configured in a half-bridge topology. Their driver IC is a Novosense NSi6602, and the LLC resonant converter is a Champion CM6901T2X IC. Precisely the same parts are used in the 1000 G7 unit.
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The FETs that regulate the 12V rail are installed on a board next to the main transformer to minimize energy losses. The DC-DC converters are installed on another vertical board.
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The mix of Rubycon electrolytic and Chemi-Con and NIC polymer caps, is the best we could ask for this PSU.
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The standby PWM controller is by Power Integrations, and a NIKO-SEM P1006BD FET is the rectifier on the secondary side of the 5VSB circuit. The same 5VSB circuit is used on the 1000 G7 model.
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Many Chemi-Con polymer caps are installed on the modular PCB for ripple filtering purposes.
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The main supervisor IC is a Weltrend WT7527RA.
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Soldering quality is decent overall, but we noticed some bad spots, which don’t affect the unit’s performance, though.
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Protechnic electric is a force in fans, so we are pleased to see one of its products in this unit.
