Cable and Connectors
The Silent Pro M 1000W is equipped with the following cables and connectors:
- One mainboard cable with a 20+4-pin connector (61 cm)
- Two CPU cables with 4+4-pin connectors (67 cm)
- Six connectors for graphics card cables
- Five connectors for peripheral power cables
Included with the PSU are:
- Six power cables for graphics cards with one 6+2-pin connector on each (50 cm)
- Two Y-shaped power splitters from one 6+2-pin to two 6+2-pin connectors for graphics cards (10 cm)
- One cable with three PATA power connectors and a floppy-drive plug (40+20+15+12 cm)
- One cable with three PATA power connectors (40+15+20 cm)
- One cable with four SATA power connectors (76+10+10+10 cm)
- One cable with four SATA power connectors (50+10+10+10 cm)
- One cable with two SATA power connectors (51+10 cm)
The PSU offers enough power connectors, perhaps even too many when it comes to the graphics card ones: the six 6+2-pin connectors are going to be enough even for a 3-way SLI configuration, so the splitters will hardly be ever required.
It is good that there are different cables with SATA and PATA power connectors because this gives the user more freedom in powering his components.
The cables are conveniently flat, soft and flexible.
The only thing we can complain about is that there is no solid 8-pin CPU power connector. Each of the two connectors consists of two 4-pin halves. The cables are long enough to be hidden behind the mainboard in almost any system case with a bottom PSU bay.
The specs are normal for a modern PSU. Most of the output power can be delivered via the +12V rail. The load capacity of the +3.3V and +5V rails is high at 183 watts. The standby source can cope with loads up to 3 amperes, as is typical of PSUs of such wattage.
The Silent Pro M 1000W features 80 PLUS Bronze certification.
Working together with our SmartUPS SC 620, this PSU was stable at loads up to 358 watts when powered by the mains but could only switch to the UPS’s batteries at 285 watts.
Cross-Load Voltage Stability
We had formed a very favorable opinion about the Silent Pro M 1000W until our practical tests. Unfortunately, its performance in the cross-load voltage stability test was far from perfect.
The most important +12V voltage is stable at low loads, remains within 3% of the required level at medium loads, and goes beyond 4% at high loads. Moreover, it is outside the permissible range when the load on the other power rails is low.
The +5V voltage is out of the required range when there’s a very low load on the +12V rail or when the combined load on the +3.3 and +5V rails is above 120-130 watts (although their specified load capacity is 183 watts). This is not a big problem, though, since modern computers can hardly load the +3.3 and +5V rails by more than 50-60 watts.
The +3.3V rail is the most stable of all. Its voltage is always within the permissible range. It is only at low loads on all the power rails that the +3.3V voltage is more than 3% off the required level.
Output Voltage Ripple
The high-frequency voltage ripple is within the norm, making the Silent Pro M 1000W better than the above-mentioned FSP Epsilon 1010W again. There are, however, occasional voltage spikes above the permissible level on the +3.3V rail.
We can see the same picture at the double frequency of the mains.
Temperature and Noise
The Silent Pro M 1000W is cooled by a 7-blade 140mm Power Logic fan (PLA14025S12H). It is half-covered by a plastic screen to optimize air flows inside the PSU.
The fan starts out at about 1000 RPM and keeps this speed until a load of 700 watts. After that it accelerates linearly up to 1930 RPM at full load.
The Silent Pro M 1000W is comfortable acoustically at most loads. Its fan only makes itself heard at loads above 800 watts. The rapid acceleration of the fan at near-maximum loads makes the PSU rather noisy compared to modern 1000W models but, considering that users prefer PSUs that have some reserve of wattage relative to their PC configuration, the Silent Pro M 1000W is indeed going to be silent most of the time.
Efficiency and Power Factor
The PSU is 85.9%, 88.3% and 82.9% efficient at the reference loads of 20%, 50% and 100% and thus meets the 80 PLUS Bronze requirements. Its peak efficiency of 88.6% was observed at a load of 422 watts.
The power factor is about 98% at high loads, which is normal for a PSU with active power factor correction.
The standby source does its job without a problem.
There are a lot of advantages about the Silent Pro M 1000W: good accessories, original exterior design, handy modular cables, low output voltage ripple, high efficiency, quiet operation (except at near-maximum loads) and an affordable price. However, these numerous advantages are negated by one and very serious downside. It cannot deliver stable voltages.