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Review: Deepcool DQ750 Evo Quanta

by Tarinder Sandhu on 22 April 2015, 14:00

Tags: Deepcool

Quick Link: HEXUS.net/qacqrq

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Testing Results

Our Chroma load-testing procedures can be found at this link.

Efficiency

Load 10% 25% 50% 75% 100%
Efficiency 82.1% 90.3% 93% 91.4% 90.9%

Efficiency starts off a little lower than we'd like at 10 per cent load, which is fairly typical of a modern PC idling or running basic tasks. Matters improve as we scale the load ladder, and getting over 90 per cent efficiency at full load is above average.

Regulation

In terms of regulation, we're looking at just how well the supply is able to hold to the various lines. The ATX spec. has a +/- 5 per cent leeway on all but the -12V line.

Line/Load 3.3V 5V 12V
10 per cent +0.7% +1.3% +1.4%
50 per cent +0.4% +0.6% +0.6%
100 per cent -1.7% -0.1% -0.3%

If efficiency is good at high loads, regulation is simply excellent, with the CWT platform doing well.

Regulation - cross-load

How about providing uneven loads that stress particular voltage rails? In the first attempt, we've put 60A on the 12V rails, and 1A on the 3.3V and 5V rails. This can actually be somewhat typical for a system heavy on graphics and CPU power. In the second, we've turned the tables and gone for 10A on both the 3.3V and 5V rails - highly unlikely in a real-world environment - and just 2A on the 12V - even more unlikely.

Line/Load 3.3V 5V 12V
Cross-load 12V focus +1.8% +1.2% -0.8%
Cross-load 3.3V/5V focus -1.3% -1.2% +1.2%

It's becoming increasingly difficult to find bad power supplies; the OEMs have all upped their game enough such that no one stands out - for good reasons or bad. Buying a supply with a quality underpinning from, say, CWT, Seasonic, Delta, et al, is easy.

Ripple

Line/Load (mv - p-p max) 3.3V 5V 12V
10 per cent 12mV 13mV 12mV
50 per cent 18mV 25mV 21mV
100 per cent 24mV 31mV 33mV

The ATX v2.2 spec states that the maximum permissible ripple is 120mV for the 12V line and 50mV for others.

PSUs convert AC power into DC, but doing so requires the AC waveform to be suppressed. What we're really testing here is the quality of the supply's rectifier and any smoothing capacitors in getting rid of this unwanted up-and-down ripple. Another very good showing here, matching what's on offer from the latest generation of Seasonic units.

Temps

Temperatures Intake Exhaust
10 per cent 31°C 39°C
50 per cent 35°C 44°C
100 per cent 39°C 47°C

Fan performance

Temps are good but they mean little in isolation. Obtaining accurate noise readings is near-on impossible when the supply is connected to the Chroma test harness and dual-unit load-tester. We can test the manufacturer's quietness claims in a different way, by using an AMPROBE TMA10A anemometer placed directly over the centre of the PSU. The anemometer records the airflow being pushed/pulled from the PSU's fan. We can use a Voltcraft DT-10L RPM meter to measure the rotational speed of the fan, too.

Load Fan RPM Airflow Noise
10 per cent 400rpm circa-15cfm Very quiet
50 per cent 500rpm circa-20cfm Very quiet
100 per cent 1,450rpm circa-65cfm Noticeable

The fan, being larger than many, means it can produce decent airflow with low-ish RPMs.

Dialled to a mid-load of 250W and therefore representing the kind of AC power used for a reasonable gaming system, the fan remains very quiet.