Test Setup

All measurements are performed utilizing ten electronic loads (seven Array 3711A, 300W each, and three Array 3710A, 150W each), which are able to deliver over 2500W of load and are controlled by a custom made software. We also use a Picoscope 3424 oscilloscope, a CHY 502 thermometer, a Fluke 175 multimeter and an Instek GPM-8212 power meter. Furthermore, in our setup we have included a wooden box, which along with a heating element is used as a Hot Box. Finally, we have at our disposal four more oscilloscopes (Rigol 1052E and VS5042, Stingray DS1M12 and a second Picoscope 3424) and a CEM DT-8852 sound level meter. In this article you will find more details about our equipment and the review methodology we follow. Finally, if the manufacturer states that the maximum operating temperature of the test unit is only 40°C then we try to stay near this temperature, otherwise we crank up the heat inside the hotbox up to 45-50°C.

Voltage Regulation Charts

The following charts show the voltage values of the main rails, recorded over a range from 60W to the maximum specified load, and the deviation (in percent) for the same load range.

5VSB Regulation Chart

The following chart shows how the 5VSB rail deals with the load we throw at it.

Efficiency Chart

In this chart you will find the efficiency of LZP-1000 at low loads and at loads equal to 20-100% of PSU’s maximum rated load.

Voltage Regulation and Efficiency Measurements

The first set of tests reveals the stability of voltage rails and the efficiency of LZP-1000. The applied load equals to (approximately) 20%, 40%, 50%, 60%, 80% and 100%, of the maximum load that the PSU can handle. In addition, we conduct two more tests. In the first we stress the two minor rails (5V & 3.3V) with a high load, while the load at +12V is only 2A and in the second test we dial the maximum load that +12V can handle while load at minor rails is minimal.


Efficiency is high, however with 20% load it barely exceeds the corresponding Platinum limit (90%) and this with 230VAC input. Nevertheless we shouldn't forget that 80 Plus organization conducts their tests at only 23°C, while we test at a much higher ambient. As you can see from the I/O temperatures up to 50% load the PSU worked in fanless mode, so the input temperature (measured on top of the cooling fan) is way higher than the output temperature (measured on the front exhaust grill), since hot air rises. Once the fan started spinning it was almost inaudible even at full speed and while the PSU was delivering its full power. Also the LZP-1000 can clearly deliver its full power even at ultra high operating temperatures, as you can see from 100% and CL2 load tests. In fact it features a very cool operation something expected since its platinum efficiency leads to minimized energy/heat dissipation, so we had to keep the heating element inside our hot box working for quite some time in order to raise the internal temperature.

Efficiency at Low Loads

In the next tests, we measure the efficiency of LZP-1000 at loads much lower than 20% of its maximum rated load (the lowest load that the 80 Plus Standard measures). The loads that we dial are 40, 60, 80 and 100W (for PSUs with over 500W capacity). This is important for scenarios in which a typical office PC is in idle with power saving turned on.


Efficiency at low loads is impressive, taking into account the large capacity of this unit. Even with only 40W load the PSU scores close to 75% efficiency and afterwards on all three remaining tests it passes the 80% mark reaching an impressive 85.8% with 100W load. This is definitely the ideal PSU for high-end systems that consume little power at idle.

5VSB Efficiency

ATX spec states that the 5VSB standby supply's efficiency should be as high as possible and recommends 50% or higher efficiency with 100mA load, 60% or higher with 250mA load and 70% or higher with 1A or more load.
We will take four measurements, three at 100 / 250 / 1000 mA and one with the full load that 5VSB rail can handle.


With mere 0.1A load on this rail efficiency is a little above the corresponding limit but once the load increases the efficiency readings go up to normal, but definitely not impressive, levels. Efficiency peaks with full load, at this rail, at 77.33%. This is a decent reading although surely not the highest we have ever seen.

Power Consumption in Idle & Standby

In the table below you will find the power consumption and the voltage values of all rails (except -12V), when the PSU is in idle mode (On but without any load at its rails) and the power consumption when the PSU is in standby (without any load at 5VSB).


Vampire power is minimal at 0.17W so the LZP-1000 passes the ErP Lot 6 2010 requirements with flying colors.