Review Index:

Antec High Current Pro Platinum 1000W Power Supply Review

Author: Lee Garbutt
Manufacturer: Antec

Load Regulation, Line Regulation and Cross-Loading

DC Output Load Regulation

One of the first things we want to see is how well this PSU can regulate the DC outputs and maintain stable voltages. To simulate real world and maximum loading conditions, the High Current Pro 1000W Platinum PSU was connected to the load testers and supplied with a constant 115 VAC. In this test we are interested in seeing how well a PSU can maintain the various output voltages while operating under different loads.

The ATX12V V2.2 tolerance for voltages states how much each output (rail) is allowed to fluctuate and has tighter tolerances now for the +12V outputs. I have also included a second table of expanded tolerances (±1% to ±6%) for reference.

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The following tables list the DC voltage results for the HCP-1000 Platinum PSU while operating on 115 VAC, 60 Hz.

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The PSU maintained excellent load regulation on all of the outputs across a broad range of loads; even when delivering the maximum rated capacity of 1,000 watts DC power. The three primary outputs stayed within ±2% the entire time; well within Antec’s claimed ±3% regulation and much better than the ATX guideline recommendations of ±5%.

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DC Output Line Regulation

In this test we are interested in seeing how well a PSU can maintain the various output voltages while the AC input line voltage changes. In the previous Load Regulation test, the AC line voltage was held constant at 115 VAC. Now we will look at how much the DC outputs change as the load is held constant and the AC line voltage is changed from 120 VAC down to 90 VAC.

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The Line Regulation test was performed with the combined DC loads set to 750W. The AC input voltage to the power supply (via the Extech power analyzer) was adjusted using a Powerstat variable autotransformer. We observed virtually no measurable change in the DC outputs, which is fairly typical of most modern PSUs.

Cross-Loading Test

PC switching mode power supplies provide multiple DC output voltages. Ideally, the total load should be distributed across all the main outputs (+3.3V, +5V, +12V). This means that the combined +3.3V and +5V load should be proportional to the combined +12V load – as one increases, so should the other. Unfortunately, this is not always the case, especially in newer PCs that predominately use +12V and may put only minimal loads on the +3.3V and/or +5V rails.

Cross-loading refers to imbalanced loads. If a PC pulls 500W on the +12V outputs and only 20W (or less) on the combined 3.3V and +5V outputs, the resulting voltage regulation may suffer.

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The High Current Pro 1000W Platinum PSU didn't have any problems handling our cross-loading tests. In the first test we put a heavy load on the +12V outputs and a light load on the remaining outputs. Even with this large imbalance, the voltages all stayed in spec.

In the second test we reversed the cross-load and placed a heavy load on the +3.3V and +5V outputs with a light load on the +12V rail. Once again, the PSU passed this test without problems with all the voltages staying well within spec.

May 21, 2012 | 09:31 PM - Posted by D1RTYD1Z619

What about the HCP-1200? Have you or can you review that one? thanks

May 22, 2012 | 01:01 AM - Posted by Ryan Shrout

Usually if we do a review of one in a family, that is all we'll do. The 1200 watt should be pretty dang close here.

May 22, 2012 | 06:46 AM - Posted by rrr (not verified)

If you use site search, you can find that HCP-1200 was reviewed a while ago.

May 22, 2012 | 11:52 AM - Posted by Ryan Shrout

True, but it was the previous generation from 2011:

January 17, 2013 | 11:00 AM - Posted by WillRock (not verified)

HCP-1200 trumps the HCP-1000 in build quality, performance and in peak power capacity.

It's the second best PSU out in the market coming after the AX1200i.

February 2, 2013 | 10:20 AM - Posted by Ultimate Gamer (not verified)

The build quality of the Hcp 1000 is second to zip sonny, Ax1200i your kidding right, tosser.

May 29, 2012 | 08:11 PM - Posted by Anonymous (not verified)

Is there a HCP-1200 Platinum?

January 17, 2013 | 11:02 AM - Posted by WillRock (not verified)

No, however Delta has built the HCP-1200 in a Platinum offering for servers, which (unfortunately) failed to clear Platinum and stayed at Gold efficiency. It's not out yet for servers, let alone in a pretty, tidied up shape for builders.

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