Articles: Cases/PSU

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Generally speaking, the detachable cables are an indisputable advantage of this PSU, especially for the owners of small system cases where it is sometimes difficult to place all the PSU cables without hindering airflows (and half of these cables are never even used at all). This problem does not exist with the Ryanpower2 – you just don’t attach the unneeded cables.

Now let’s test this unit. The table above sets the maximum load currents of the Ryanpower2 against the typical 400W PSU as described by the ATX12V 2.0 standard (by the way, this is the highest-wattage unit described there). As you see, the PSU from A.C. Ryan has a lower load current on the +12V rail despite its higher total wattage.

The diagrams of the cross-load characteristics of this PSU look perfect, but it’s natural considering the dedicated regulation of the output voltages employed in it.

The oscillogram of the output voltages at max load looks perfect, too. The peaks of the pulsations are much below the acceptable limits (which are 50 millivolts for the +5V rail and 120 millivolts for the +12V rail). I didn’t notice any low-frequency pulsation at all (particularly, at 100Hz) in the oscillograms.

The PSU flexibly controls the speed of its fans in a wide range depending on the load. The acoustic parameters of the device are rather average – the fans aren’t practically audible at small loads but speed up to hearable rotations-per-minute as the PSU is warming up.

The power factor of the PSU is very close to 1, thanks to the active PFC. Its efficiency is average, no more than 80% at best, but complying with the requirements. By the way, I measured the efficiency at 220V input voltage. If the voltage in the power grid is lower (the PSU supports input voltages from 90 to 240V without manual switching), the efficiency is going to be lower due to a higher loss in the PFC unit.

So, the A.C. Ryan Ryanpower2 ACR-PS2094 model is a good power supply on the whole. It boasts an excellent stability of its voltages, a minimal level of the pulsations, and quiet operation, while its detachable cables are very handy. Alas, but it is not free from certain defects. The quality of soldering isn’t high in some spots. The unit doesn’t have normal power outputs for SATA drives and a separate 6-pin connector for the graphics card, and the enclosed mainboard cable has only a 20-pin plug. Yet anyway, the advantages of this PSU outweigh its defects for me.

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