Articles: Cases/PSU

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Cross-Load Stability

Unless there is a very low load on the +12V rail, its voltage remains within 3% of the default level. The difference is even as small as 1% in the typical load range. That’s a splendid result.

The +5V voltage is blameless, too. It’s only at highly misbalanced loads that it deflects much from the required level. It won’t differ from 5 volts sharp by more than 2% in the typical load range. The green zone of this voltage is somewhat higher than our reference configurations, though.

The +3V rail is stable enough, too. This voltage deflects no more than by 3%.

Output Voltage Ripple

The output voltage ripple is strong on the +12V and +3.3V rails, reaching up to the permissible maximum on the latter. The +5V rail is much better in this respect.

The picture doesn’t change at the double frequency of the power mains. The voltage ripple is strong on the +3.3V rail and weak on the +5V rail.

Temperature and Noise

The Litepower LP-450AH2NF is cooled by a 120mm fan that has a Thermaltake label (the part number is TT-1225A) but the real manufacturer Yate Loon is indicated, too. The blades of this fan are somewhat wider than usual at the ends.

The fan starts out at 950 RPM and keeps this speed until 50% load, being quite comfortable. Then it begins to accelerate linearly, reaching 1600 RPM at 100% load. The fan gets uncomfortably noisy at near-maximum loads.

Overall, this PSU is quite acceptable in terms of noisiness.

Efficiency and Power Factor

According to my measurements, the Litepower LP-450AH2NF is somewhat less efficient than its relation Antec VP450P at low loads but more efficient at high loads: over 85% at 130 watts and higher.

The active PFC device isn’t very good here. It’s about as effective as that of the Antec VP450P.

Standby Source

The standby source is blameless, keeping its voltage within 2% of the required level.


The Thermaltake Litepower LP-450AH2NF is good in electrical and acoustic characteristics, but you may find its cables not very handy. You may have to use a power adapter for your optical drive and prefer a system case with a top PSU bay. But if its cables suit you just fine, it can make a good buy for reasonable money.

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