Corsair AX1500i Power Supply Review
by E. Fylladitakis on September 11, 2014 5:00 AM EST- Posted in
- Cases/Cooling/PSUs
- Corsair
- PSUs
- 1500W
Hot Test Results
From the tables below, we can see that the output power quality of the Corsair AX1500i is simply setting new performance records. Our instrumentation recorded a maximum ripple of just 16mV on the 12V line under maximum load, while drawing 107.2 Amperes from it! Cross loading the voltage lines had virtually zero effect on the stability of the unit, courtesy of the dual LLC PSU design we mentioned in the Internal Design section. Finally, the voltage regulation is remarkable, with the worst and best results being 0.5% and a mere 0.15% on the 5V and 12V lines, respectively!
| Main Output | ||||||||
| Load (Watts) | 300.98 W | 751.78 W | 1126.37 W | 1501.55 W | ||||
| Load (Percent) | 20.07% | 50.12% | 75.09% | 100.1% | ||||
| Line | Amperes | Volts | Amperes | Volts | Amperes | Volts | Amperes | Volts |
| 3.3 V | 5.15 | 3.34 | 12.86 | 3.34 | 19.3 | 3.33 | 25.73 | 3.33 |
| 5 V | 5.15 | 5.02 | 12.86 | 5.02 | 19.3 | 5 | 25.73 | 4.99 |
| 12 V | 21.44 | 12.03 | 53.6 | 12.02 | 80.4 | 12.01 | 107.2 | 12.01 |
| Line |
Regulation (20% to 100% load) |
Voltage Ripple (mV) | |||||
| 20% Load | 50% Load | 75% Load | 100% Load |
CL1 12V |
CL2 3.3V + 5V |
||
| 3.3V | 0.4% | 6 | 10 | 12 | 12 | 4 | 8 |
| 5V | 0.5% | 4 | 6 | 10 | 12 | 6 | 10 |
| 12V | 0.15% | 6 | 8 | 12 | 16 | 14 | 6 |
High ambient temperature have a miniscule impact on the energy conversion efficiency of the Corsair AX1500i, reducing the average nominal load (20-100%) efficiency down to 94.6% and the maximum efficiency of the PSU to 96.5%. The overall efficiency drop is a mere 0.3% percent over a temperature rise of 25°C, which is simply amazing, displaying both the effectiveness of the design and the quality of the active components. As such, the conversion losses remained nearly unaffected despite the much higher ambient temperature.
Overall, the behavior of the cooling system inside our hot box was similar to our "cool" testing results, with the sole exception being that the fan turns on at a much lower load than before. It also gets noticeably louder, but considering the massive power output, the AX1500i did not get hot at all, suggesting that the thermal control circuit is programmed to maintain low operating temperatures under any circumstance. We would be hard-pressed to find such low temperature readings even in reviews of units with half the capacity of the AX1500i.
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sweetca - Thursday, September 11, 2014 - link
Thank you!tim851 - Thursday, September 11, 2014 - link
>>The advantage of having more power than you need is to let the components breathe better,>>widen the pipeline so to speak.
What? This is audiophile-grade fluffy language. And a load of...
>>You may not need 1500W, but the extra headroom provides for stabilty and overclocking potential.
...bullsh!t.
You either need 1500w or you don't.
If you're overclocked setup draws 600w from the wall, having a 1500w PSU is not going to improve stability or overclocking.
quick brown fox - Thursday, September 11, 2014 - link
Maybe he worded it with some level of ambiguity, but the point he wanted to come across can be easily understood.If your overclocked setup draws 600W from the wall, theoretically you can have a 600W PSU supply all of that without the PSU going out of regulation. However, if you still have some room for additional overclocking (from better cooling), your overclocked setup might draw an additional 50-100W, and your 600W PSU (depending on its quality) won't have that headroom to sustain the additional power draw, which would lead of course to instability.
So what you're avoiding is the PSU becoming a bottleneck when you still have the capability to overclock further.
tim851 - Friday, September 12, 2014 - link
Perhaps that's what he means.But the fluffy language he uses let's me rather suspect he's one of those people who believes a higher powered PSU makes his PC faster. Because moar power!!!
Like the audiophiles who think a super-expensive HDMI cable that is thick as a child's arm is improving colors and clarity of their blu-rays.
DanNeely - Thursday, September 11, 2014 - link
Maybe. If you've got a low power system with a decent smaller PSU this would probably be worse becuase you're in the sweet spot for the smaller PSU and in the low-load suck range on this monster. if you're running a 500W box on a 550W PSU, this would probably do better at full load since the 550 would be in the nearly maxxed out suck zone; OTOH the 550 would probably still do better at idle. You normally get peak efficiency around the 50% point and good performance from 20-80% before falling off at either end (see the curves on pages 3/4).80+ Platinum is the first 80+ spec to set an efficiency requirement at 10% too; and platinum units generally do a lot better at low loads. OTOH since they're all still halo priced; unless you live somewhere with really expensive electricity they're not going to pay for themselves vs more mainstream models.
AnnihilatorX - Friday, September 12, 2014 - link
Different PSUs have different efficiency curves at different power loads, so it is hard to say. Generally they are most efficient between 20-80% load.FriendlyUser - Thursday, September 11, 2014 - link
Great product, but the price is only meant for high-end workstations and the like. I think it would be useful for such extreme products to enumerate the connectors.I am asking this because I was looking at the ASUS Z10PE workstation MB supporting dual Haswell Xeons with massive 150W TDPs. The MB in question requires 1xATX 24pin, 2x8pin EPS AND an optional but recommended 6pin EPS 12V connector for SLI/Crossfire. I haven't yet found a PSU with a 6-pin ATX 12V power connector, and I am almost certain it's not the same as PCIe.
vred - Thursday, September 11, 2014 - link
It is the same as PCIE 6-pin connector. You have not found a PSU with a 6-pin ATX 12V connector, because there is no such connector. :)
vred - Thursday, September 11, 2014 - link
Running this PSU to power my watercooled quad-Titan Black workstation running CUDA calculations. PSU remains surprisingly quiet and mildly warm to touch even under full load.philosofa - Thursday, September 11, 2014 - link
What a beautiful piece of hardware; fantastic to see something pushing so hard at the bounds that define 'well made'. Cheers for the review, was fantastic H/W pr0n to read :D