Posted in Cases/Cooling/PSUs , PSU , Corsair , AX , 80Plus Gold , 750W
Package Contents and Power Rating
There are a few extras in the package, which is typical of high-end PSUs. Included are several cable ties, mounting screws, the power cable, and a users manual, plus a couple of cloth bags that can be reused. On the package we can see that the AX750 is EuP-ready (low power loss in standby mode) and is a compact design measuring 160mm including the modular connection panel. Their reviewer's guide suggested we look at efficiency at 50% load, where the AX750 will be at the maximum 90% or greater level, but we'll also look at how it handles lower and higher loads.
Here we have an external impression of the Corsair model. The Case has a black, scratch-resistant surface with a Corsair logo on both sides. It has honeycombed ventilation holes and a small power switch near the AC plug. It's a very well-made product, with our only complaint being that the fan grille protrudes a little.
Corsair uses a single +12V rail that nearly delivers the full rated power. The AX has DC-to-DC for the smaller rails, so +12V feeds +3.3V/+5V and you can't use the whole 62A there. Even so, Corsair wants to supply modern components with plenty of juice, and 744W minus (up to) 125W is still a good rating. As you can see on the label, 100-240VAC and 50-60Hz are no problem for this PSU. The Corsair AX has active PFC, and we've tested the efficiency and PFC on both power grids.
"Gold requirements. 91% at 50% load is not to shabby."
It should be "too shabby."
props to corsair, another solid unit.
"The AX has DC-to-DC for the smaller rails, so +12V feeds +3.3V/+5V and you can't use the whole 62A there."
I know of exactly ZERO XXX-watt power supplies where you can load 3.3V or 5V _in_addition_to_ the XXX watts being consumed on 12V rails.
Actually, most PSU's on the market do not allow anywhere near 99% of its rated load purely via 12V rails like this one. So if anything, such an arrangement should considered a plus.
Without knowing exactly what the hardware differences are between PSUs and how this impacts performance or reliability makes it challenging when purchasing a new PSU. I watch hardware sites for patterns of issues with specific PSU models and brands when I'm looking for a new PSU.
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The only potential issue is if you want to load up all we SATA connectors with a bottom-mounted PUS; the distance from the PSU to the first connector is only 45cm (give or take), with a fairly large 12-13cm gap between the connectors, so you'd want the HDD bays to be relatively close to the PSU rather than in the top portion of the case.
First sentence has a few typos. Still reading, but figured I'd point it out.