Enermax's Infiniti 720W
A premium package

With a street price hovering near $195, Enermax's Infiniti PSU is the most expensive model in this comparison. Interestingly, though, the Infiniti's 720W total output rating isn't the highest of the bunch. So why does the it cost more than the others?

Because it's loaded.

To start, the Infiniti comes active power factor correction and certifications for SLI and 80 Plus efficiency. In fact, Enermax promises efficiency between 82 and 85% when the power supply is under a load of at least 20% of its capacity. You also get an 8-pin PCIe connector, should your graphics card's power requirements exceed that of most folks' entire systems.

Enermax even throws in a little bling, caging the Infiniti's monster 140mm fan behind a faux gold grill. The Infiniti is one of only two PSUs in this round-up to sport a 140mm fan, and that should allow it to move more air at lower noise levels than its competitors.

Air moved by this fan should have no problem making its way out the PSU's hole-riddled back panel. There you'll also find a status light that reflects the PSU's general disposition.

Modular cables are also on the menu, and they're sheathed, mostly. The sheathing only goes about halfway down the PCIe leads and only to the first connector on the SATA and 4-pin peripheral cables, which feels a little chintzy given the Infiniti's price tag. The PSU's three-year warranty isn't anything special, either.

The Infiniti starts to make up ground when we look at its DC voltage delivery. 3.3 and 5V levels are practically flat regardless of the load and within half a percent of their targets. The 12V lines don't waver much as the load increases, either, although they're as much as 1.5% shy of nailing 12 volts exactly.

Ripple is a little higher on the Infiniti than we've seen with some of the other PSUs, at least at 50 and 75% loads. However, even there, AC content doesn't average much higher than 18 millivolts. Voltage delivery gets a little cleaner under a 100% load.

Enermax claims the Infiniti's efficiency is between 82 and 85%, but our own testing doesn't quite bear that out. The Infiniti certainly isn't wildly inefficient, though.