Articles: Cases/PSU
 

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Temperature and Noise

The PSU is cooled by a 135mm 9-blade Scythe Kama Flex fan that runs on fluid dynamic bearing (part number: SA1325FDB12PM). About a quarter of the fan’s area is blocked by a triangular sheet of transparent plastic to optimize air flows.

The fan starts out at about 600 RPM and keeps this speed until a load of 160 watts. It remains quiet until a load of 450 watts when it reaches a speed of 1000 RPM. The fan accelerates afterwards in the same steady manner, reaching 1600 RPM at full load. This is a lower speed than with many other same-wattage PSUs. The difference in temperature between the incoming and outgoing air is 11°C, which is far from dangerous.

Overall, the Chouriki 2 Plug-in is above average in terms of noisiness. I guess there will be even noisier sound sources, like a graphics card cooler, in those situations when its fan becomes audible.

UPS Compatibility

Connected to my APC SmartUPS SC 620, the PSU was stable at loads up to 390 watts when powered by the mains but couldn’t switch to the batteries even at 280 watts.

Output Voltage Stability

The +12V rail behaves like in the Hiper K800 and Enhance EPS-1280GB4: this voltage deflects less from the nominal value when the load is higher. However, the Chouriki 2 Plug-in allows this voltage to deflect more (up to 4% at minimum loads and with a large 3% zone) and only keeps it within 1% at loads over 500 watts on the +12V rail.

The green zone of the +5V voltage is somewhat higher than the typical load range, yet it's not going to deflect more than 2% from 5 volts in most real-life computers.

The +3.3V voltage is most stable when there’s medium load on the +12V rail. It doesn’t deflect more than by 3% at low and high loads on the +12V rail, though.

Overall, this PSU does well at rather high loads. It’s going to be good at powering a gaming rig with a couple of SLI or CrossFire-linked graphics cards.

Output Voltage Ripple

The high-voltage ripple is conspicuous at full load but doesn't go beyond the prescribed limits.

The same goes for the low-frequency ripple.

Efficiency and Power Factor

The power factor is somewhat lower than what you can get with the best active PFC implementations but that's not a crucial parameter for home users.

The efficiency meets the 80+Silver requirements: 88.9% at 20% load, 91.1% at 50% load, and 87.3% at full load.

+5V Standby Source

The load of 6 amperes, which is very high for a standby source, is handled without problems.

Summary

The Scythe Chouriki 2 Plug-in (SPCR2-850P) is good in terms of electric properties, highly efficient, not very noisy and free from obvious shortcomings. It shouldn’t be installed into low-end computers as its purpose is to power top-performance gaming machines.

 
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