DeepCool has added two new mid-range semi-modular power supplies to their lineup and both come with an 80Plus Gold rating. The DQ750 EVO has 750 watts and the DQ650 EVO has 650 watts, as the names might suggest and that is the only difference between the two. Today i will check the Quanta DQ750 EVO. It meets the requirements of 80 Plus Gold certification and is equipped with a combined cable system.
The scheme includes product protection circuit of various abnormal conditions(OVP, SCP, OTP, UVP, OPP).It has an MTBF rated for 120 thousand hours.
Packaging & Contents
The DeepCool Quanta DQ750 EVO power supply ships in a plain brown box with the company logo on the front,alongside some basic information on the power supply.The 80 Plus Gold logo can be seen.
The rear of the box is more detailed, highlighting many of the buying points.
This side of the box lets us know how many connectors of each type are available for the unit.
The other side gives us the rails info for the DQ750 EVO.
The power supply is protected inside a layer of bubblewrap,which will offer a high level of protection during shipping.
Included with the DQ750 EVO is a power chord, four black case screws and a warranty card.
Quanta DQ750 EVO has flat ribbon cables.
The cable lengths are very good on this unit and should pose no issues even in a full tower chassis.
The PSU
The aesthetic appearance of the Quanta DQ750 EVO is very distinctive, with a textured surface that exhibits a metallic-flecked paint job.The real beauty, however, lies in the functional aspect that can't be ignored, as this finish is very scratch resistant.And even if it is scratched, it isn't noticed because the speckled effect will camouflage any offending nick or smudge.
DeepCool has used a 140mm fan to keep the temperature of interior components in check.
The one side of the unit have the Quanta DQ logo in a gold-mustard color.
The other side has the spec sheet with all the pertinent information you may require.
The backside panel features an open grill and includes a power receptacle and master On-Off switch.The honey comb grill allows air to exhaust out of the power supply for cooling the internal components with minimal turbulence and noise.
The front of Quanta DQ750 EVO is where all the action happens from a user perspective, which is typical of what we see on modular power supplies.
Cables with connectors ATX (24 pins) and EPS (4 + 4 pin) fixed rigidly and cables with four power connector PCIe (6 + 2-pin), eight SATA connectors and four Molex connectors are connected as desired.
A Look Inside
Unlike most power supplies these days, DeepCool's DQ750 EVO is securely held together by not just four Philips-head screws,but six. It is clear DeepCool never intended for their customers to crack open the power supply to take a look inside.Besides,there is a good five-year warranty on it,and opening it would void it of its warranty. There are no user serviceable parts inside anyway,so for most people, this is really not a big deal. At first glance, the internal components of the DQ750 EVO seems to be quite densely packed, but it still leaves quite a bit of space at the top.This is necessary to accommodate the overhead 140mm fan to bring airflow over the internal components for heat dissipation, which is more than enough to keep temperatures in check. As well, this is a 80 Plus Gold certified power supply,and we know higher efficiency leads to lower heat production.The photo below shows how clean and tidy DeepCool has placed the internal components for best performance in cooling and dissipation of heat.I am surprised to see three small heatsinks painted black,as most power supplies in this range usually incorporate larger and taller toothed fins. It is also good to know the OEM of the power supply is Channel Well Technology (CWT), a highly reputable manufacturing known for quality products in this category, and manufactures quite a bit of components by themselves. So without wasting your time any further, let's take a closer look at the different internal components.
The layout of the unit is again mostly traditional with the topology being a resonant LLC primary with a synchronous rectification secondary and DC-DC VRMs for the minor rails.
Starting on the primary side, the input filtering starts at the AC input receptacle and it then trails along the edge of the main PCB.
DeepCool has implemented two X-capacitor. A whopping six ceramic Y-capacitors,and three ferrite coils.
Just past this, we see the bridge rectifier is sandwiched between it's own heatsink and a heatsink also housing the main switching transistors and the PFC power components.
Between this large heatsink and the edge of the PCB, we find the APFC coil and the main input capacitor which is a Nippon Chemi-con rated at 400v 560uF. This unit is rated at 105c, whereas typical power supplies usually incorporate capacitors rated at 85c.
Moving over to the secondary side,we see that the most prominent feature with this design is the add-in PCB that is housing the DC-DC VRMs and this PCB is right next to the heatsink that is attached to the 12v MOSFETs.
Contained on this PCB, and found around the main PCB, are a number of solid and standard capacitors all from Nippon Chemi-con.
Lastly, the wiring is well bundled and the mesh sleeving extends well inside the unit to protect the wiring. The soldering is a little better than I’m used to seeing from CWT.
Lastly, we are presented with a large 140mm fan to provide cooling to the DQ750 EVO's internal components. The D14BM-12 model produced by Yate Loon actually is a 140x140x25 12V ball bearing type of fan which moves 62CFM at 1400rpm and 29dBA. The considerable low air flow level means less rpm and thus lower noise levels, at least when the fan speed scales nicely with the power supply internal heat level.
Test System
Below we report the instrumentation used in the test phase for DeepCool Quanta DQ750 EVO.
PowerKiller 2.0. Test bench designed for power supplies up to 2185W.
Stingray DS1M12 USB Oscilloscope
PCE-PA 6000 Wattmeter
Range 1W ~ 6kW
Accuracy ± 1.5%
Multimeters
3 x HT81
1 x ABB Metrawatt M2004
1 x Eldes ELD9102
1 x Kyoritsu Kew Model 2001
1 x EDI T053
Scythe Kama Wireless Thermometer
Center 325 sound level meter
Voltage Variance
Load regulation is excellent right across the output range.
Cross Load
The unit passes my Cross Load testing with a set of very good results. Even when i hit the +12V output with 60A, the line held at 11.95V.
AC Ripple
The +12V output peaked at 35mV at full load which is a good result. +3.3V peaked at 15mW, however i noticed that the +5V output hit 40mV at full load, which seems quite high, and close to the industry rated tolerance levels.
Efficiency
The power supply is efficient, peaking at close to 92% at 50% load. This drops to around 89% at full load. Impressive results.
Temperature
The 140mm fan spins slowly below 500W and the high level of efficiency means the heat produced isn’t excessive at all. At full load it peaks at a 12c above ambient intake.
Noise Level
The large fan holds a low level of noise right through the range, spinning up at around 550W output. In the last 75W of output it rotates much faster although it never becomes intrusive even when holding a steady 750W load.
Conclusion
The DeepCool Quanta DQ750 EVO came into testing as a bit of an underdog. When I flipped my attention to the actual testing metrics, I found a competitive unit when it came to the load tests. DeepCool have partnered up with CWT and based the power supplies on the Quanta EVO platform. Technically the unit delivers good results in most areas. Ripple suppression and efficiency both rate as excellent.Load regulation is excellent and it handled our intensive Cross load test without a hiccup. Ripple suppression was commendable, however i did notice the +5V rail peaked at 40mV under full load – this raised an eyebrow. While a little higher than i would hope to see, it is important to point out that this doesn’t fall outside industry rated tolerance levels. The quality of the modular cabling is excellent, and with all being flat, they will be easy to route, improving the appearance of a system build.The large 140mm fan is very quiet, and even when the power supply is handling higher loads above 500 watts, it remains barely audible. If you value low noise levels then the DeepCool Quanta DQ750 EVO will make an ideal partner for a new system build.
There is no doubt that the DeepCool Quanta DQ750 EVO is a capable, well designed power supply. It is set to target the discerning enthusiast audience powering a high end system, featuring perhaps two graphics cards in SLi or Crossfire – and with a restricted budget. In the end,there isn't much to complain about--because there isn't much you can actually complain about!