Our load tests utilize a couple of FAST ATE active load testers and a variety of other equipment such as an oscilloscope, power conditioner, temperature probe and a power consumption meter. You can read more about our standard testing approach here.
The tests performed are based around six conceivable setups that are out there and progressively load down the PSU up to the power supply's limits or 1000W, whichever comes first. Since our test equipment's limits are higher than that of the OCZ Fatal1ty 750W power supply, we can test it to the maximum.
The above tests represent typical loads that we have measured from various systems and are meant to give a rough idea of where your computer might fall in line with our tests. Please keep in mind that each system is different and actual loads can vary greatly even with similar hardware.
Let's start by taking a look at the voltages to see how well this unit did during testing. Starting with the 12V rail, we see 3% regulation from start to finish with a total drop of .28V. The 5V rail managed to stay within 3% of specification with a total drop of .016V from start to finish. Moving towards the 3.3V rail, we see that regulation was within 3% of specification with a total voltage drop of .12V.
DC Output quality for the OCZ Fatal1ty 750W was within specifications. During Test 1, we saw 19mV of noise on our scope. When we increased the loads in Test 3, the ripple climbed to 39mV at a little over half load. During Test 5 under a load of 750W, the oscilloscope showed a maximum of 52mV on noise on the 12V rail.
The OCZ Fatal1ty 750W is rated for 80 PLUS Bronze efficiency. This means that the power supply must perform at 82%/85%/82% efficiency at 20%/50%/100% loads respectively. As you can see, the OCZ Fatal1ty 750W passed on our bench, and wasn't close to failing at any point.
Last year, OCZ did a fantastic job in bringing the Fatal1ty 1000W power supply to market and it raised the standard quite a bit as to what we would expect in the future from the Fatal1ty series of power supplies. Not only did the unit perform well, but it was built well and looked great too. Topping it off, the individually sleeved cables on all of the wires was great to see.
This year's iteration of the Fatal1ty series of power supplies just doesn't seem like it is a step forward, but more like a step backward. Taking a look at performance numbers alone, the unit does much worse than what we saw last year. All of the rails have dropped to within 3% of ATX specifications concerning voltage regulation. DC output quality has taken a much worse dive, climbing all the way to 52mV at full load. Making things a little worse is that while the efficiency is right where is should be for the rating the power supply carries is that the rating is two full tiers lower than what we received last year from OCZ.
The build quality isn't particularly fantastic either. When looking at the box, I felt like I was going to be presented with top notch equipment, especially after reading "professional quality" on the front and "gear used by the pros" on the back. I can tell you with utmost certainty that you'll never catch a power supply of this quality in something that the pros use and I'm actually surprised to see something with Suscon capacitors even bear the Fatal1ty name. They show too as the voltage regulation and DC output quality just isn't what we'd hoped to see.
Don't take all of this to mean that the Fatal1ty 750W power supply from OCZ is a bad unit. It is in fact a good unit at a cheap price. Unfortunately, due to branding and marketing, we find that we just aren't being delivered anything close to what we were expecting, and this holds even more truth when we consider what we've been given in the past. We felt that OCZ was really on track with last year's unit and hoped they would build upon that.
Instead we've been given less with less price. There are already plenty of units that can give us less for less on the market though so hopefully OCZ can rectify this and give us something better with the next generation of Fatal1ty units.