Part Analysis
| 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 | 1x NTC Thermistor SCK-207R0 (7 Ohm @ 25°C) & Relay |
| Bridge Rectifier(s) |
2x GBJ2506 (420V , 25A @ 100°C)
|
| APFC MOSFETs |
3x Infineon IPA60R125P6 (600V, 19A @ 100°C, Rds(on): 0.125Ohm) &
1x Sync Power SPN5003 FET (for reduced no-load consumption) |
| APFC Boost Diode |
1x CREE C3D06060 (600V, 16A @ 150°C)
|
| Bulk Cap(s) | |
| Main Switchers |
2x Infineon IPA60R190P6 (600V, 12.7A @ 100°C, Rds(on): 0.19Ohm)
|
| APFC Controller |
Champion CM6500UNX
|
| Resonant Controller |
Champion CU6901VACNH
|
| Topology |
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 8x Toshiba HR8504PL (40V, 150A @ 25°C, Rds(on): 0.85mOhm) |
| 5V & 3.3V | DC-DC Converters: 4x UBIQ QN3107M6N (30V, 70A @ 100°C, Rds(on): 2.6mOhm) PWM Controllers: UPI-Semi uP3861P |
| Filtering Capacitors | Electrolytic: 6x Nippon Chemi-Con (105°C, W), 3x Rubycon (6-10000 @ 105°C, ZLH), 1x Rubycon (2-10,000h @ @ 105°C, XF)) Polymer: 28x FPCAP , 6x Nippon Chemi-Con |
| Fan Controller | Microchip PIC16F1503 |
| Fan Model | Corsair NR140HP (140mm, 12V, 0.33A, Fluid Dynamic Bearing Fan) |
| 5VSB Circuit | |
| Rectifier |
1x SMC RS1M (1000V, 1A @ 100°C)
|
| Standby PWM Controller | On-Bright OB2365T |
Channel Well Technology provides the platform, the same OEM that manufactured the previous generation of RMx units. CWT also makes the RMx Shift units. The RMx platform is different from the RMx Shift one, which is expected given the different placement of the modular board. The new RMx platform looks overloaded with parts, although the PCB’s dimensions are normal, and several daughter boards are used to save some space. Given the PSU’s efficiency, the heatsinks are large enough to take some burden off the fan’s shoulders for reduced noise output. The electrolytic caps on the secondary side are not blocked from the fan’s airflow and belong to Chemi-Con’s W series. Although polymer caps are preferred for ripple filtering because of their increased tolerance to high operating temperatures and their high ripple current ratings, still, their increased cost and reduced capacitance make the electrolytic caps a requirement for every PSU. To cope with increased transient loads, besides a high-speed response, you also need increased capacitance on the secondary side, and that is where the electrolytic caps are required since they offer a high price per capacitance ratio.
The build quality is high, with good parts everywhere and excellent soldering quality on the PCB. The design follows the modern trend, with an APFC converter, half-bridge topology and an LLC resonant converter on the primary side. On the secondary side is a synchronous rectification scheme for the 12V rail, and a pair of DC-DC converters for the minor rails. The PSU also uses a Microchip MCU to control the fan’s speed.
The fan is the usual aspect; the Corsair NR140HP which uses a fluid dynamic bearing that won’t bother you at low speeds.
I’m looking into getting one of these.
But they have also downgraded the fan which is dissappointing, the previous version of the RM1000x had a magnetic levitation fan (NR140ML). Given that both versions are currently available (with the older coming in cheaper) – I am wondering if the prior version is a better purchase
I would buy the new one. The ML fan was a bit noisy with the specific fan speed profile.
I bought one of these. It made a small amount of coil whine when I tested it in my old PC, but only when idling in windows (starting any app up made the noise go away completely). However on my main PC it makes no noise whatsoever, phew! I like the fan control, I have it turned to it’s lowest setting where it is still inaudible but at least this removes the heat rather than letting it radiate in to my PC case.