Antec HCP-750 80 Plus Gold
by Martin Kaffei on October 26, 2011 4:35 AM EST- Posted in
- Cases/Cooling/PSUs
- PSUs
- Antec
- 80Plus Gold
- 750W
- High Current Pro
Voltage Regulation
| +3.3V Regulation/Ripple and Noise | |
| Load | Voltage |
| 5% | +1.70% (15 mV) |
| 10% | +1.58% (15 mV) |
| 20% | +1.39% (14 mV) |
| 50% | -0.61% (10 mV) |
| 80% | -1.61% (13 mV) |
| 100% | -2.06% (16 mV) |
| 110% | -2.30% (15 mV) |
| Crossload +12V max. | -0.18% |
| Crossload +3.3V/+5V max. | -2.72% |
| +5V Regulation/Ripple and Noise | |
| Load | Voltage |
| 5% | +2.00% (22 mV) |
| 10% | +2.00% (23 mV) |
| 20% | +1.80% (22 mV) |
| 50% | +0.00% (10 mV) |
| 80% | -0.80% (12 mV) |
| 100% | -1.10% (14 mV) |
| 110% | -1.20% (13 mV) |
| Crossload +12V max. | +0.86% |
| Crossload +3.3V/+5V max. | -2.96% |
| +12V Regulation (Worst Rail)/Ripple and Noise (Worst Rail) | |
| Load | Voltage |
| 5% | +1.28% (9 mV) |
| 10% | +1.24% (8 mV) |
| 20% | +1.16% (7 mV) |
| 50% | +0.42% (35 mV) |
| 80% | -0.42% (30 mV) |
| 100% | -0.45% (28 mV) |
| 110% | -0.51% (27 mV) |
| Crossload +12V max. | -0.67% |
| Crossload +3.3V/+5V max. | +0.63% |
Noise Levels
| Sound Pressure Level (Ambient: 16dBA. 1m distance) | |
| Load | dB(A) |
| 5% | 18 |
| 10% | 18 |
| 20% | 18 |
| 50% | 20 |
| 80% | 23 |
| 100% | 27 |
| 110% | 31 |
Efficiency and PFC
| 115VAC. 60Hz | ||
| Load | Efficiency | PFC |
| 5% | 69.95% | 0.842 |
| 10% | 79.10% | 0.911 |
| 20% | 87.08% | 0.986 |
| 50% | 90.78% | 0.989 |
| 80% | 89.36% | 0.991 |
| 100% | 87.99% | 0.993 |
| 110% | 87.23% | 0.992 |
| 230VAC. 50Hz | ||
| Load | Efficiency | PFC |
| 5% | 76.42% | 0.810 |
| 10% | 80.36% | 0.840 |
| 20% | 87.52% | 0.970 |
| 50% | 90.87% | 0.982 |
| 80% | 90.04% | 0.985 |
| 100% | 89.80% | 0.988 |
| 110% | 88.17% | 0.990 |
As you can see we have two new tests. 5% is exactly half of the load we use at 10%, and it shows how the PSU performs below the 80 Plus loads (20% and more). In addition you can find crossload tests in the charts above.
Crossload tests are static loads where we try to put the PSU under stress with high current on 3.3V/5V and low current on 12V, or high current on 12V and low current on 3.3V/5V. Since most PSUs have a common forward converter the PWM-IC can only regulate one voltage while the other ones are coupled to the same control loop via resistors. (Usually +3.3V has its own mag amp or shunt regulator; -12V uses a transistor.) This is the reason why 12V is often too high when 5V is loaded with a low current and too low when 5V is loaded with a high current. An example: the control circuit has no reason to raise 5V with 1A load while 12V is at 20A load. 12V is very low now, e.g. 11.40V, but since these voltages have the same regulation, 12V won't be raised since 5V is the reference value.
At 5-20% load the fan is no quieter than the one from the HCP-1200, which was already silent and close to our measurement limit. Therefore the fan rotates somewhat slower at high load. In addition, there is no background noise, which is something we see in the air channels of an 80mm design. The bad thing is we always hear the ball bearing of the ADDA fan; Sanyo Denki would be a better choice here. At its peak nearly 91% efficiency can be achieved. The power factor is a maximum of 0.990. Ripple and noise is very low during all loads. It might look unusual that ripple and noise are higher at low load, but this is a typical result for the CM6901X IC and the resonant circuit. Overall the performance is great.
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34 Comments
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versesuvius - Wednesday, October 26, 2011 - link
I hereby declare all the patents granted by American patent offices null and void.Beenthere - Wednesday, October 26, 2011 - link
Because many companies use multiple PSU manufacturers, i.e. Antec, Corsair and others, I always recommend that consumers read objective PSU tests that show power output @ 50C, noise, ripple, etc. and that examine the internal components for quality. This Antec unit doesn't use the quality Japanese caps that better PSUs tend to use and this could be it's downfall for a couple dollars or less in production cost.shriganesh - Thursday, October 27, 2011 - link
This article is rather bad in explaining the internals of an PSU. It assumes that every reader is an electrical/power electronics engineer! The technical stuff should be explained more and not simply analyzed without explaining to the (average) reader!danjw - Thursday, October 27, 2011 - link
Why not have other PSUs listed in charts, like most reviews? That way we do not need to dig into old reviews to do direct comparisons to comparable products.