Summary: It is confirmed. OCZ made a strong come back into the high-end PSU category with the release of the ZX series. The smallest member of the ZX series exhibited high efficiency through out 20-100% load range, its voltage regulation was within 3% for all major rails and handled full power even after we cranked up the temperature inside our hot box. On top of that it managed to pass all of our very difficult Advanced Transient Response tests.
Pros: Handled full power at over 50°C ambient, High efficiency, All rails stayed within 3% voltage regulation, Passed all Advanced Transient Response tests, Good ripple/noise suppression, Fully modular design, Lots of SATA/peripheral connectors
Cons: Lacks an MOV in the transient filtering stage, Price is on the high side, Low efficiency at loads below 65W, +12V slope does not ramp smoothly in Turn-On Transient tests
Summary: Final Thoughts
OCZ has put together a very solid power supply in the ZX Series. In our testing the rails were very solid, with only minor ripples way under the threshold that we like to see. The ZX Series has a 80 PLUS Gold certification, which means it will run 87% efficient at 100% load. Talking about operation the ZX Series is extremely quiet and you can barely tell that it is on, your CPU fan will be louder than this power supply.
Pros: Good performance, Completely modular, 80 PLUS Gold certified, 5 year warranty
Summary: At the 850W level the new OCZ ZX power supply will give you all the juice and stability you could want in a power supply. With 70A on that single 12V rail the ZX has plenty of available current to handle most multi-GPU gaming rigs. And in order to provide power to those video cards there are a total of four 6+2 pin PCIe power connectors, which could be a rarity with an 850 watt PSU.
Excerpt: CDATA[ We have just taken a look at the OCZ ZX Series 850W Modular PSU. This unit is completely modular and is one of the best units we’ve ever taken a look at. It supports four PCIe connections and a ton of peripherals on a single 70Amp 12v rail.
Summary: We initially plugged the PSU into an EZ PSU Tester 3 in order to power it on for our "idle" measurements. As noticed below, the voltage rails were fairly stable with no load, but these aren't necessarily indicative of overall load performance. According to our Kill-a-Watt, the power draw was 3W. We thought these results would be interesting to include and compare with other power supplies to see how they manage a non-load situation, and how much power the PSU itself...
Pros: Extremely low electrical noise, Rated conservatively when analyzing specifications, Lots of connects and SLI certified, +12v rail is ROCK SOLID, 3.3v and 5v rails are the cleanest we've seen, Totally modular design
Summary: The OCZ ZX 850W seems to be a very robust and heavy duty power supply. With up to 70A of +12V and 850W of total continuous power available, the ZX 850W should run nearly any dual-GPU configuration that it is cabled for. Being outfitted with quad PCI-E 6+2pin connections offers a good deal of flexibility that many 750W class power supplies simply don't have.
Summary: The OCZ ZX Series 850 W is a fierce competitor to the
power supply. Both cost exactly the same (USD 200) and have similar performance and specifications (single +12 V rail, full modular cabling system, 90% efficiency at typical load). The OCZ model has as advantage coming with 12 SATA power connectors, while the Seasonic model comes with eight, while the Seasonic model has as advantages presenting a lower noise and ripple levels on its +12 V outputs (20 mV vs.